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HYDRA

Service Manual

2-4

DIGITAL I/O AND

TOTALIZE INPUT

ALARM OUTPUTS

SCAN TRIGGER INPUT

RS-232

AC IN

P10

J10

TB2

TB1

A/D

CONVERTER

MAIN

DISPLAY

2625A

ONLY

IEEE

ANALOG

INPUT

CONNECTOR

2620A

ONLY

REAR

PANEL

MEMORY

CHANNELS 11…20

CHANNELS 1…10

CHANNEL 0

S1F.EPS

Figure 2-1. Interconnect Diagram

Summary of Contents for 2620A

Page 1: ...nd higher HYDRA 2620A Data Acquisition Unit 2625A Data Logger 2635A Data Bucket Service Manual PN 202231 February 1997 1997 Fluke Corporation All rights reserved Printed in U S A All product names are...

Page 2: ...warranty period To obtain warranty service contact your nearest Fluke authorized service center or send the product with a description of the difficulty postage and insurance prepaid FOB Destination...

Page 3: ...circuits If necessary the user should consult the dealer or an experienced radio television technician for additional suggestions The user may find the following booklet prepared by the Federal Commu...

Page 4: ......

Page 5: ...Danger High voltage Ground Earth Terminal Protective ground earth terminal Must be connected to safety earth ground when the power cord is not used See Section 2 Attention refer to the manual This sy...

Page 6: ...n good condition Refer cord and connector changes to qualified service personnel Do Not Operate in Explosive Atmospheres To avoid explosion do not operate the instrument in an atmosphere of explosive...

Page 7: ...on Guard Crossing 2 6 2 7 Digital Inputs and Outputs 2 6 2 8 A D Converter PCA 2 6 2 9 Analog Measurement Processor 2 6 2 10 Input Protection Circuitry 2 6 2 11 Input Signal Conditioning 2 6 2 12 Anal...

Page 8: ...31 2 71 Memory PCA 2625A Only 2 33 2 72 Main PCA Connector 2 33 2 73 Address Decoding 2 33 2 74 Page Register 2 34 2 75 Byte Counter 2 34 2 76 Nonvolatile Memory 2 34 2 77 IEEE 488 Interface Option 05...

Page 9: ...A 68 Watchdog Timer and Reset Circuit 2A 34 2A 69 Display Controller 2A 34 2A 70 Memory Card Interface PCA 2A 37 2A 71 Main PCA Connector 2A 37 2A 72 Microprocessor Interface 2A 37 2A 73 Memory Card C...

Page 10: ...Accuracy Test Using DIN IEC 751 4 12 4 13 Digital Input Output Verification Tests 4 13 4 14 Digital Output Test 4 13 4 15 Digital Input Test 4 14 4 16 Totalizer Test 4 14 4 17 Totalizer Sensitivity T...

Page 11: ...on 5A 3 5A 2 Servicing Surface Mount Assemblies 5A 3 5A 3 Error Codes 5A 4 5A 4 General Troubleshooting Procedures 5A 6 5A 5 Power Supply Troubleshooting 5A 8 5A 6 Raw DC Supply 5A 8 5A 7 Power Fail D...

Page 12: ...8 Controller 7 4 7 7 IEEE 488 Transceivers Connector 7 5 7 8 General Maintenance 7 5 7 9 Removing the IEEE 488 Option 7 5 7 10 Installing the IEEE 488 Option 7 7 7 11 Performance Testing 7 7 7 12 Trou...

Page 13: ...ptions 2635A 2A 22 2A 5 Function Relay States 2635A 2A 24 2A 6 AC Volts Input Signal Dividers 2635A 2A 28 2A 7 Front Panel Switch Scanning 2635A 2A 33 2A 8 Display Initialization Modes 2635A 2A 36 4 1...

Page 14: ...Troubleshooting Guide 2635A 5A 13 5A 4 DC Volts HI Troubleshooting 2635A 5A 18 5A 5 AC Volts HI Troubleshooting 2635A 5A 18 5A 6 Ohms Open Circuit Voltage 2635A 5A 19 5A 7 Ohms HI Troubleshooting 263...

Page 15: ...fer Simplified Schematic 2635A 2A 28 2A 7 A D Converter Simplified Schematic 2635A 2A 30 2A 8 Command Byte Transfer Waveforms 2635A 2A 35 2A 9 Grid Control Signal Timing 2635A 2A 37 2A 10 Grid Anode T...

Page 16: ...635A 5A 23 5A 8 Test Points Display PCA A2 2635A 5A 25 5A 9 Display Controller to Microprocessor Signals 2635A 5A 26 5A 10 Display Test Pattern 1 2635A 5A 26 5A 11 Display Test Pattern 2 2635A 5A 26 6...

Page 17: ...Introduction and Specifications Title Page 1 1 Introduction 1 3 1 2 Options and Accessories 1 3 1 3 Operating Instructions 1 3 1 4 Organization of the Service Manual 1 4 1 5 Conventions 1 5 1 6 Speci...

Page 18: ...HYDRA Service Manual 1 2...

Page 19: ...when discussing features unique to one instrument The instrument is designed for bench top field service and system applications A dual vacuum fluorescent display uses combinations of alphanumeric cha...

Page 20: ...then given for each block These descriptions explore operation to the component level and fully support troubleshooting procedures defined in Chapter 5 Chapter 2A Theory of Operation 2635A This chapt...

Page 21: ...res and functions The term Hydra refers to any of theseinstruments The model number e g 2620A 2625A or 2635A isused when features unique to one instrument are being described Printed Circuit Assembly...

Page 22: ...rature Measurement Thermocouple types J K E T N R S B and Hoskins Engineering Co type C are supported Also DIN IEC 751 Pt 385 Platinum RTDs are supported Totalize Events on the Totalizing Input Alarms...

Page 23: ...for one instrument right or left side PM 8922 Switchable X1 X10 passive probe RS40 Shielded RS 232 terminal interface cable Connects the instrument to any terminal or printer with properly configured...

Page 24: ...puts Resolution Range Slow Fast 300 mV 10 V 0 1 mV 3V 0 1 mV 1 mV 30V 1 mV 10 mV 300V 10 mV 0 1V Accuracy V Range 18 C to 28 C 0 C to 60 C 90 Days Slow 1 Year Slow 1 Year Fast 1 Year Slow 1 Year Fast...

Page 25: ...0 0 66 0 72 1 45 1 70 1 29 1 23 2 16 E 100 00 0 00 500 00 1000 00 0 50 0 36 0 40 0 58 0 53 0 38 0 43 0 65 0 99 0 72 0 77 1 11 0 75 0 52 0 71 1 16 1 22 0 86 1 05 1 63 T 150 00 0 00 400 00 0 79 0 42 0 3...

Page 26: ...defeated by computer command RTD Inputs Type DIN IEC 751 100 Platinum RTD 1 Year 4 Wire Accuracy C Temperature Resolution 18 C to 28 C 0 C to 60 C C Slow Fast Slow Fast Slow Fast 200 00 0 02 0 01 0 0...

Page 27: ...10 kHz 10 kHz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz 1 42 2 5 mV 0 29 2 5 mV 0 14 2 5 mV 0 22 2 5 mV 0 6 3 0 mV 1 0 5 0 mV 1 42 4 mV 0 29 4 mV 0 14 4 mV 0 22 4 mV 0 6 5 mV 1 0 10 mV 1 53 2 5 mV 0 40 2 5...

Page 28: ...mum at 50 or 60 Hz 0 1 1 k imbalance slow rate Maximum AC Input 300V rms or 424V peak on channels 0 1 and 11 150V rms or 212V peak on channels 2 to 10 and 12 to 20 Voltage ratings between channels mus...

Page 29: ...175 0 2 3k 0 053 0 2 0 057 0 2 0 057 2 0 172 0 2 0 172 2 30k 0 055 2 0 059 2 0 059 20 0 176 2 0 176 20 300k 0 053 20 0 057 20 0 057 200 0 184 20 0 184 200 3M 0 059 200 0 063 200 0 063 2k 0 203 200 0...

Page 30: ...nnels per Second for 1 10 and 20 Channel Scans with Shorted Inputs Function Range Slow Fast Channels 1 10 20 1 10 20 VDC 300 mV 1 7 3 6 3 8 2 2 10 3 12 9 VDC 3V 1 7 3 6 3 8 2 2 10 3 12 9 VDC 30V 1 7 3...

Page 31: ...losure and TTL compatible high 2 0V min 7 0V max low 0 6V min 0 8V max Isolation None dc coupled Minimum Pulse Width 5 s Maximum Frequency 5 Hz Specified Conditions The instrument must be in the quies...

Page 32: ...mes may necessitate adding up to 0 008 to the dc voltage and ac voltage accuracy specifications Alternatively any resulting shift can be compensated for by recalibrating the instrument Relative Humidi...

Page 33: ...c to 16V dc 10W maximum If both sources are applied simultaneously ac is used if it exceeds approximately 8 3 times dc Automatic switchover occurs between ac and dc without interruption At 120V ac the...

Page 34: ...hat input L low is tied to earth ground refer to Using Shielded Wiring in Section 5 For dc volts and thermocouple temperature measurements a source impedance of 1 k in series with the H high input is...

Page 35: ...the typical effect of a 60 Hz 100V ac signal on another channel for the 30 k range you would calculate 100 X 8 4 X 10 5 0 008 k AC Signal Crosstalk into a Temperature Channel Frequency 50 60 Hz Temper...

Page 36: ...interpolate between the applicable 0 C to 60 C and 18 C to 28 C accuracy specifications Response Times Refer to Typical Scanning Rate and Maximum Autoranging Time later in this table DC Voltage Inputs...

Page 37: ...Rejection 53 dB minimum at 60 Hz 0 1 slow rate 47 dB minimum at 50 Hz 0 1 slow rate Common Mode Rejection 120 dB minimum at dc 1 k imbalance slow rate 120 dB minimum at 50 or 60 Hz 0 1 1 k imbalance s...

Page 38: ...1 83 1 57 1 37 1 32 2 58 E 100 to 25 25 to 350 350 to 650 650 to 1000 0 44 0 43 0 49 0 78 0 46 0 45 0 53 0 85 0 86 0 76 0 89 1 31 0 55 0 66 0 85 1 34 1 05 1 02 1 27 1 85 T 150 to 0 0 to 120 120 to 40...

Page 39: ...0 77 0 69 0 67 1 48 1 58 1 37 1 27 2 23 E 100 to 25 25 to 350 350 to 650 650 to 1000 0 46 0 40 0 49 0 59 0 47 0 41 0 53 0 65 0 87 0 75 0 89 1 11 0 57 0 62 0 86 1 34 1 06 0 98 1 27 1 65 T 150 to 0 0 to...

Page 40: ...feated by computer command RTD Inputs Type DIN IEC 751 100 Platinum RTD 1 Year 4 Wire Accuracy C Temperature Resolution 18 C to 28 C 0 C to 60 C C Slow Fast Slow Fast Slow Fast 200 00 0 02 0 01 0 08 0...

Page 41: ...10 kHz 10 kHz 20 kHz 20 kHz 50 kHz 50 kHz 100 kHz 1 42 2 5 mV 0 29 2 5 mV 0 14 2 5 mV 0 22 2 5 mV 0 6 3 0 mV 1 0 5 0 mV 1 42 4 mV 0 29 4 mV 0 14 4 mV 0 22 4 mV 0 6 5 mV 1 0 10 mV 1 53 2 5 mV 0 40 2 5...

Page 42: ...at 50 or 60 Hz 0 1 1 k imbalance slow rate Maximum AC Input 300V rms or 424V peak on channels 0 1 and 11 150V rms or 212V peak on channels 2 to 10 and 12 to 20 Voltage ratings between channels must n...

Page 43: ...5 0 2 3k 0 053 0 2 0 057 0 2 0 057 2 0 172 0 2 0 172 2 30k 0 055 2 0 059 2 0 059 20 0 176 2 0 176 20 300k 0 053 20 0 057 20 0 057 200 0 184 20 0 184 200 3M 0 059 200 0 063 200 0 063 2k 0 203 200 0 203...

Page 44: ...table Typical Scanning Rate Function Range Slow Fast Channels 1 10 20 1 10 20 VDC 300 mV 1 7 3 6 3 8 2 2 10 3 12 9 VDC 3V 1 7 3 6 3 8 2 2 10 3 12 9 VDC 30V 1 7 3 6 3 8 2 2 10 3 12 9 VDC 150 300V 1 7...

Page 45: ...ure and TTL compatible high 2 0V min 7 0V max low 0 6V min 0 8V max Isolation None dc coupled Minimum Pulse Width 5 s Maximum Frequency 5 Hz Specified Conditions The instrument must be in the quiescen...

Page 46: ...ed specifications 15 minutes when relative humidity is kept below 50 non condensing Operating Temperature 0 C to 60 C 32 F to 140 F Storage Temperature 40 C to 70 C 40 F to 158 F Instrument storage at...

Page 47: ...imum from a channel terminal to any other channel terminal within channels 2 to 10 and 12 to 20 Size 9 3 cm high 21 6 cm wide 31 2 cm deep 3 67 in high 8 5 in wide 12 28 in deep Weight Net 2 95 kg 6 5...

Page 48: ...HYDRA Service Manual 1 32...

Page 49: ...2 Analog to Digital A D Converter 2 6 2 13 Inguard Microcontroller Circuitry 2 6 2 14 Channel Selection Circuitry 2 7 2 15 Open Thermocouple Check Circuitry 2 7 2 16 Input Connector Assembly 2 7 2 17...

Page 50: ...itry 2 27 2 61 Channel Selection Circuitry 2 27 2 62 Open Thermocouple Check 2 28 2 63 Input Connector PCA 2 28 2 64 Display PCA 2 29 2 65 Main PCA Connector 2 29 2 66 Front Panel Switches 2 29 2 67 D...

Page 51: ...VDD and 5 6V dc VDDR and outguard digital circuitry of 5 1V dc VCC Within the Power Supply the Raw DC Supply converts ac line voltage to dc levels The 5V Switching Supply converts this raw dc to 5 1V...

Page 52: ...PUTS SCAN TRIGGER INPUT RS 232 AC IN J3 J5 J6 J4 J2 J1 P10 J10 J1 P2 J2 P1 J1 P1 P1 TB2 TB1 A D CONVERTER MAIN DISPLAY 2625A ONLY IEEE ANALOG INPUT CONNECTOR 2620A ONLY REAR PANEL MEMORY CHANNELS 11 2...

Page 53: ...PLAY CONTROLLER VACUUM FLUORESCENT DISPLAY DISPLAY ASSEMBLY SERIAL COMMUNICATION ANALOG MEASUREMENT PROCESSOR A D CONVERTER INPUT SIGNAL CONDITIONING INPUT PROTECTION INPUT MULTIPLEXING GUARD CROSSING...

Page 54: ...ed and or scaled to a dc voltage for measurement by the a d converter DC voltage levels greater than 3V are attenuated To measure resistance a dc voltage is applied across a series connection of the i...

Page 55: ...ements 2 18 Reference Junction Temperature A semiconductor junction is used to sense the temperature of the thermocouple input terminals The resulting dc output voltage is proportional to the block te...

Page 56: ...h A1S1 the front panel POWER switch connects the output of the rectifiers to the filter capacitor and the rest of the instrument Depending on line voltage the output of the rectifiers is between 7 5 a...

Page 57: ...for troubleshooting purposes A1Q7 and A1Q8 are driven by the outputs of D flip flop A1U22 Resistors A1R34 and A1R28 and diodes A1CR11 and A1CR12 shape the input drive signals to properly drive the ga...

Page 58: ...Kernel The Digital Kernel is composed of the following eight functional circuit blocks the Microprocessor the ROM Read Only Memory the NVRAM Clock Nonvolatile Random Access Memory and Real Time Clock...

Page 59: ...coded using the ROM signal and address bits 9 through 12 by A1U15 and A1U21 When ROM is high and all four of the address bits are low the I O signal A1U21 8 is low The I O signal and address bits 3 th...

Page 60: ...p by A2Z1 on the Display PCA The detailed description of the Display PCA describes how the Microprocessor interfaces to the Keyboard 2 37 ROM The ROM provides the instruction storage for the Microproc...

Page 61: ...ic 50 millisecond interrupt used for interval time operation The output from the Totalizer Input circuit A1U28 3 provides the clock input for Counter 2 Counter 2 operates as a 16 bit pre loadable down...

Page 62: ...talled in the option slot This connector also routes an interrupt signal from the IEEE 488 option to the IRQ2 input of the Microprocessor An option sense signal from the installed option allows the Mi...

Page 63: ...reshold voltage and hysteresis for inverting comparator A1AR2 The inverting input of the comparator A1AR2 2 is protected by a series resistor A1Z3 and diode A1CR14 A negative input clamp circuit A1Q9...

Page 64: ...e the input signal must remain stable for greater than 1 5625 milliseconds before that transition changes the state of the clock input of the totalizer counter A1U2 4 2 48 External Trigger Input Circu...

Page 65: ...minor cycle is begun whichever comes first 2 51 Input Protection The instrument measurement circuits are protected when overvoltages are applied through the following comprehensive means Any voltage t...

Page 66: ...31 32 33 36 37 39 40 41 42 3 84 MHz TO U9 TO U9 DIGITAL SECTION TO U9 NOT ALL U8 SWITCHES ARE SHOWN HERE REFER TO THE SCHEMATIC DIAGRAM IN SECTION 8 OPEN THERMOCOUPLE DETECT 51 52 Z2 C12 1 05V VR1 VD...

Page 67: ...ork 16 17 18 19 20 V1 GRD V2F V2 GRD Tap 1 on the DCV input divider ohms reference network Driven guard Tap 2 input on the DCV input divider ohms reference network Tap 2 on the DCV input divider ohms...

Page 68: ...Signal Conditioning Each input is conditioned and or scaled to a dc voltage appropriate for measurement by the a d converter DC voltage applied to the a d converter can be handled on internal ranges o...

Page 69: ...led by A3Z4 The input is applied to pin 1 of A3Z4 and a 1000 1 divider is formed by the 10 M and 10 01 k resistors when switches S3 and S9 are closed in A3Z4 The attenuated HI input is then sent throu...

Page 70: ...of time by the A D Converter through the HI SENSE path of A3R11 A3K17 A3R42 and A3U8 switch S2 and the LO SENSE path of A3R35 and Analog Processor switch S19 Passive filtering is provided by A3C34 A3C...

Page 71: ...th measurement current is provided by the A3U8 ohms source through one of the A3U8 internal switches S6 S9 S13 or S15 and the appropriate reference resistor in A3Z4 The current flows through relay A3K...

Page 72: ...3 FEEDBACK RESISTOR A3Z3 2 776k RMS COVERTER A3C15 A3C16 A3R11 A3U6 INPUT HI A3R44 A3C31 s6f eps Figure 2 6 AC Buffer Simplified Schematic JFETs A3Q3 through A3Q9 select one of the four gain or attenu...

Page 73: ...citors A3C14 and A3C11 are switched into the measurement circuit in front of the A3U8 A D Converter by switches S86 S87 and S88 These capacitors act with the 100 k series resistance provided by A3R42...

Page 74: ...d fast measurement rates the a d converter uses its 300 mV range for most measurement functions and ranges The primary exceptions are that the 3V dc range is measured on the a d converter 3V range the...

Page 75: ...lines and can monitor the state of the analog processor using the FC 0 7 lines Filter zeroing is controlled by the ZERO signal The open thermocouple detect circuitry is controlled by the OTCCLK and OT...

Page 76: ...nto the A D Converter PCA from the rear of the instrument provides 20 pairs of channel terminals for connecting measurement sensors This assembly also provides the reference junction temperature senso...

Page 77: ...rom the power supply These six signals SWR1 through SWR6 are connected to a bidirectional I O port on the microprocessor Each successive column has one less switch This arrangement allows the unused i...

Page 78: ...When the beeper A2LS1 is off A2U1 17 is pulled to ground by A2R1 This signal is then inverted by A2U6 with A2U6 6 driving the CLR input high to hold the four bit counter reset Output A2U4 8 of the fo...

Page 79: ...4 16 directly Figure 2 8 shows the waveforms during a single command byte transfer Note that a high DISRX signal is used to hold off further transfers until the Display Controller has processed the pr...

Page 80: ...imately 1 14 milliseconds every 13 8 milliseconds resulting in each grid on the display being strobed about 72 times per second The grid strobing sequence is from GRID 10 to GRID 0 which results in le...

Page 81: ...by the 5 1V dc power supply VCC The Memory PCA is sensed by the Microprocessor on the Main PCA through the connection of A6J1 11 to the option sense signal OPS A6J1 22 2 73 Address Decoding Circuitry...

Page 82: ...e for the next sequential byte in the Non Volatile Memory 2 76 Nonvolatile Memory The Non Volatile Memory is made up of two 128K byte static CMOS memories with integrated lithium battery power fail de...

Page 83: ...6 2A 12 Analog to Digital A D Converter 2A 6 2A 13 Inguard Microcontroller Circuitry 2A 6 2A 14 Channel Selection Circuitry 2A 7 2A 15 Open Thermocouple Check Circuitry 2A 7 2A 16 Input Connector Ass...

Page 84: ...ler Circuitry 2A 32 2A 60 Channel Selection Circuitry 2A 32 2A 61 Open Thermocouple Check 2A 32 2A 62 Input Connector PCA 2A 33 2A 63 Display PCA 2A 33 2A 64 Main PCA Connector 2A 33 2A 65 Front Panel...

Page 85: ...ts ac line voltage to dc levels The 5V Switching Supply converts this raw dc to 5 0V 0 25V dc which is used by the Inverter in generating the above mentioned outputs The Power Fail Detector monitors t...

Page 86: ...ALARM OUTPUTS SCAN TRIGGER INPUT RS 232 AC IN J3 J5 J6 J4 J2 P4 P10 J10 J1 P2 J2 P1 J1 TB2 TB1 A D CONVERTER MAIN DISPLAY P2 MEMORY CRAD INTERFACE ANALOG INPUT CONNECTOR CHANNELS 11 20 CHANNELS 1 10...

Page 87: ...SSEMBLY ANALOG MEASUREMENT PROCESSOR A D CONVERTER INPUT SIGNAL CONDITIONING INPUT PROTECTION INPUT MULTIPLEXING GUARD CROSSING ANALOG INPUT CONNECTOR A D CONVERTER PCA DIGITAL I O 5 6 Vdc VDDR RS 232...

Page 88: ...d or scaled to a dc voltage for measurement by the a d converter DC voltage levels greater than 3V are attenuated To measure resistance a dc voltage is applied across a series connection of the input...

Page 89: ...Reference Junction Temperature A semiconductor junction is used to sense the temperature of the thermocouple input terminals The resulting dc output voltage is proportional to the block temperature an...

Page 90: ...ges use a slow blow 0 125 A 250V fuse On the secondary side of the transformer rectifiers A1CR2 A1CR3 and capacitor A1C7 rectify and filter the output When it is ON switch A1S1 the front panel POWER s...

Page 91: ...A1U9 2 which A1U9 interprets as 1 24V dc because A1U9 3 ground is connected to the 5 1V dc output A1U9 maintains the feedback and reference voltages at 1 24V dc and thus regulates the 5 1V dc source 2...

Page 92: ...to warn the Microprocessor that the power supply is going down A comparator in A1U10 compares the divided down raw supply voltage to a voltage reference internal to A1U10 When the raw supply voltage i...

Page 93: ...be high Conversely for any write cycle R W must be low The Microprocessor is a variant of the popular Motorola 68000 processor and is enhanced by including hardware support for clock generation addre...

Page 94: ...2A 1 Microprocessor Interrupt Sources 2635A Pin Signal Name Description A1U1 95 XTINT External Trigger Interrupt Highest Priority A1U1 96 CINT Real Time Clock Interrupt once per second A1U1 121 KINT...

Page 95: ...Card Interface handles wait state timing for any accesses to MCARD When the Microprocessor is starting up also referred to as booting the address decoding maps the address space as shown in Table 2A...

Page 96: ...select A1U1 128 for these devices goes low for any memory access to A1U14 or A1U16 The FLASH signal goes through jumper W3 which must always be installed during normal instrument operation W3 is remo...

Page 97: ...0 signal going low When the instrument is powered up the accuracy of the timebase generated by the internal crystal may be tested by measuring the frequency of the 1 Hz square wave output A1U12 4 The...

Page 98: ...al elements after the Microprocessor has loaded the configuration into the FPGA Clock Dividers Internal Register Address Decoding Keyboard Scanner Digital I O Buffers and Latches Totalizer Debouncing...

Page 99: ...high again The FPGA will interrupt the Microprocessor again when the switch on the Display Assembly is detected as open again Actually the Microprocessor will be interrupted once for each debounced c...

Page 100: ...ill remain at 5 0V dc until the instrument is powered down except for a short period of time when the user changes RS 232 communication parameters from the front panel of the instrument Clear To Send...

Page 101: ...1CR14 to conduct current clamping the comparator input A1U3 13 at approximately 0V dc The input threshold of 1 4V dc and a hysteresis of 0 5V dc are used for all Digital Input Buffers When the input o...

Page 102: ...is protected from electrostatic discharge ESD damage by A1R58 A1C54 A1Z3 and A1CR15 Capacitor A1C54 helps ensure that the instrument meets EMI EMC performance requirements The input XTI is then route...

Page 103: ...cuit Description 2A 2A 21 Passive filtering of dc voltage and resistance measurements Active filtering of ac voltage measurements A D conversion Support for direct volts true rms ac volts temperature...

Page 104: ...32 33 36 37 39 40 41 42 3 84 MHz TO U9 TO U9 DIGITAL SECTION TO U9 NOT ALL U8 SWITCHES ARE SHOWN HERE REFER TO THE SCHEMATIC DIAGRAM IN SECTION 8 OPEN THERMOCOUPLE DETECT 51 52 Z2 C12 1 05V VR1 VDD 5...

Page 105: ...e network Driven guard Tap 2 input on the DCV input divider ohms reference network Tap 2 on the DCV input divider ohms reference network Driven guard 21 22 23 24 25 V0 GRD OVS GRD AGND1 Tap 0 on the D...

Page 106: ...od The basic measurement unit a minor cycle consists of a fixed time integrate period for the unknown input a variable time reference integrate period a variable time hold period and various short tra...

Page 107: ...ted to the VDDR supply a magnetic field is generated causing the relay armature and contacts to move to or remain in the desired position Function relay states are defined in Table 2A 5 Table 2A 5 Fun...

Page 108: ...4 PASSIVE FILTER A D HIGH LOW A3R34 A3Z4 10 01k A3K16 S9 S3 S10 A3Z4 10M A3R10 A3R11 A3K17 S2 INPUT HI INPUT LO s14f eps Figure 2A 4 DC Volts 300V Range Simplified Schematic 2635A 2A 54 Ohms and RTDs...

Page 109: ...rate voltage measurements in order to improve noise rejection One fixed period integration is performed on the voltage across the unknown resistance and the second integration is performed on the volt...

Page 110: ...resistor in A3Z4 The current flows through relay A3K16 thermistor A3RT1 resistor A3R10 the HI Source instrument relay contacts A3K1 A3K3 A3K5 A3K14 and the HI Source lead wire to the unknown resistanc...

Page 111: ...vided by 10 100 or 1000 for the 300 mV 3V and 30V ranges respectively The resistance ratios used are summarized in Table 2A 6 Note that the 111 1 k resistor is left in parallel with the smaller higher...

Page 112: ...imes reasonably short Between channel measurements the passive filters are discharged by JFET A3Q2 under control of Microcontroller A3U9 through comparator A3U14 When the ZERO signal is asserted A3R14...

Page 113: ...Switch S69 connects the buffer output through pin B 1 for the 100 mV range S71 connects the output through B 32 for the 300 mV range S73 connects to pin B1 for the 1V range and S75 sets up the 3V ran...

Page 114: ...nnel 0 or the rear channels Inductors A3L1 through A3L24 reduce EMI and current transients Selection between 2 wire and 4 wire operation for ohms measurements is performed by latching 2 form C relays...

Page 115: ...the strain relief headers is electrically isolated from all other pins and circuitry Temperature sensor transistor A4Q1 outputs a voltage inversely proportional to the temperature of the input channe...

Page 116: ...sistor in network A2Z1 Normally the resistance between any two of the interface signals is approximately 20 k Checking resistances between any two signals SWR1 through SWR6 verifies proper termination...

Page 117: ...high reset signal to the Display Processor The Watchdog Timer on the Display Assembly A2U5 A2U6 and various resistive and capacitive timing components is held cleared by TP1 being held at 0V dc by a...

Page 118: ...izable pattern that allows for simple testing of display operation Test patterns 1 and 2 are shown in Section 5 of this manual The Display Controller provides 11 grid control outputs and 15 anode cont...

Page 119: ...30V GRID X 30V GRID X 1 GRID ANODE TIMING 5V 30V 72 s 22 5 s 117 s 67 5 s 140 s 0V 5V 0V s20f eps Figure 2A 10 Grid Anode Timing Relationships 2635A 2A 70 Memory Card Interface PCA The Memory Card Int...

Page 120: ...49 is driven to a low level by the Microprocessor The XWRU signal A6U1 51 is then driven low by A1U11 13 to initiatethe transfer of the data bus inputs on the Memory Card Controller D8 through D15 to...

Page 121: ...ument is being powered up or down Each of the Memory Card data bus lines CD 0 through CD 7 has a series resistor A6Z2 that helps ensure that the instrument meets EMI EMC performance requirements The M...

Page 122: ...ection signals mating last This sequence is reversed on memory card removal The PCMCIA Memory Card Connector has a metal shell that is connected to chassis ground to help ensure that the instrument me...

Page 123: ...handling them 3 Using the procedures packaging and bench techniques that are recommended The following practices should be followed to minimize damage to S S static sensitive devices 1 MINIMIZE HANDL...

Page 124: ...E EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC FREE WORK STATION PLACING SHORTING STRIPS ON EDGE CONNECTOR HELPS PROTECT INSTALLED S S DEVICES 9 HANDLE S S DEVICES ONLY AT A STATIC FREE...

Page 125: ...the Display PCA 3 6 3 15 Remove the IEEE 488 Option 2620A Only 3 11 3 16 Remove the Memory PCA 2625A Only 3 11 3 17 Remove the Memory Card I F PCA 2635A Only 3 11 3 18 Remove the Main PCA 3 12 3 19 Re...

Page 126: ...HYDRA Service Manual 3 2 3 30 Install the Handle and Mounting Brackets 3 15 3 31 Install the Instrument Case 3 15...

Page 127: ...Hz The instrument also operates from dc power 9 to 16V dc DC input power is connected to the rear input connector J6 pin 8 DCH and pin 7 DCL If both ac and dc power sources are connected to the instru...

Page 128: ...Handle boards by their nonconductive edges only Store plastic vinyl and Styrofoam objects outside the work area 2 Store and transport all static sensitive components and assemblies in static shieldin...

Page 129: ...lies with the limit for a class B computing device pursuant to Subpart J of Part 15 of FCC Rules 0 1 2 3 TR 0 1 2 3 4 5 6 7 9 16 V DC PW R 30V DIGITAL I O MEETS 0871 B To Remove Squeeze and Slide Out...

Page 130: ...remove the Front Panel Assembly E 1 Remove the leads connected to the two input terminals Using needle nose pliers pull and disconnect the wires at the rear of the V and COM input terminals 2 Using n...

Page 131: ...General Maintenance Disassembly Procedures 3 3 7 CHASSIS REAR BEZEL CASE A B MOUNTING SCREW 2 GROUNDING SCREW s22f eps Figure 3 2 Removing the Case...

Page 132: ...be lifted away from the Front Panel Assembly Only if necessary gently remove the display window M by releasing the two snaps along its inside bottom edge While pushing slightly on the rear of the wind...

Page 133: ...General Maintenance Disassembly Procedures 3 3 9 Y U N Q P J O Z A D B C V W G K L M E T X H I s24f eps Figure 3 4 2620A and 2625A Assembly Details...

Page 134: ...HYDRA Service Manual 3 10 Q Y U P J O A D B C V W G K L M E T X H I s25f eps Figure 3 5 2635A Assembly Details...

Page 135: ...d by letter e g A are shown in Figure 3 4 1 From the bottom of the instrument locate the Memory PCA Q This pca is connected to front of the Main PCA Note You might want to verify that this is the Memo...

Page 136: ...connector screws T at the Rear Panel Use a 3 16 inch nut driver to loosen the connector securing hardware 7 If installed remove the IEEE 488 connector Use a 7 mm nutdriver to loosen the two securing s...

Page 137: ...A for assembly details of standard instrument parts Note Parts referenced by letter e g A are shown in Figure 3 4 2620A or 2625A or Figure 3 5 2635A 3 22 Install Miscellaneous Chassis Components Use t...

Page 138: ...sentials If necessary refer to Section 7 paying particular attention to Figures 7 2 and 7 3 1 Place the IEEE 488 PCA N into position so that the edge of the pca fits into the chassis guide Then line u...

Page 139: ...20 pin cable G to the Display PCA 3 29 Install the Front Panel Assembly Use the following procedure when installing the Front Panel Assembly 1 Position the Front Panel Assembly into place and snap th...

Page 140: ...HYDRA Service Manual 3 16...

Page 141: ...nce Source 4 11 4 12 RTD Temperature Accuracy Test Using DIN IEC 751 4 12 4 13 Digital Input Output Verification Tests 4 13 4 14 Digital Output Test 4 13 4 15 Digital Input Test 4 14 4 16 Totalizer Te...

Page 142: ...ucket Embedded Instrument Firmware 4 27 4 31 Using the PC Compatible Firmware Loader Software 4 28 4 32 Setup Procedure for Firmware Download 4 29 4 33 Default Instrument Firmware Download Procedure 4...

Page 143: ...n Calibrator DC Voltage Range 90 mV to 300V dc Accuracy 0 005 Fluke 5700A AC Voltage Frequency 1 kHz 100 kHz Voltage 29 mV to 300V 15 mV to 300V Accuracy 0 05 1 25 Frequency 10 kHz 1V rms 0125 Decade...

Page 144: ...ment and wait 1 2 hour for its temperature to stabilize 2 Connect a cable from the Output VA HI and LO connectors of the 5700A to the V and COM connectors on the Hydra front panel Select the channel 0...

Page 145: ...100 kHz 1 kHz 1 kHz 1 kHz 1 kHz 19 71 18 50 289 26 275 00 2 8934 28 931 149 54 289 34 20 28 21 50 290 74 305 00 2 9066 29 069 150 46 290 66 Note Voltages greater than 150V can only be applied to chann...

Page 146: ...d 300 volt range on Hydra and apply 0V dc from the 5700A Then apply 290V dc input from the 5700A Ensure the display reads between the minimum and maximum values as shown in Table 4 2 for the 0 and 290...

Page 147: ...nd the following commands MON 0 CR FUNC 0 VDC I1V CR Set the 5700A to output 0 9V dc Send the following commands MON 1 0 CR MON_VAL CR The value returned should be 900 mV 0 22 mV 899 78 to 900 22 mV 4...

Page 148: ...H L H H L H L H L H L H L H L H L H L L H L H H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L STRAIN RELIEF 1 11 2 12 3 13 4 14 5 15 6 16 7...

Page 149: ...INPUT MODULE CHANNEL 1 SHOWN HERE 12 11 13 14 15 16 17 18 19 20 2 1 3 4 5 6 7 8 9 10 SOURCE 4 WIRE SENSE 4 WIRE H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L 4 WIRE 4...

Page 150: ...Table 4 3 Thermocouple Information Type Positive Lead Positive Lead Color Negative Lead Usable Range Material ANSI IEC Material C J Iron White Black Constantan 200 to 760 C Tungsten 5 Rhenium White Tu...

Page 151: ...tance Source and the other uses an RTD Only one of the tests needs to be performed to verify operation 4 11 RTD Temperature Accuracy Test Using Decade Resistance Source Verify that the channel 0 accur...

Page 152: ...Switch OFF power to the instrument and disconnect all other high voltage inputs 2 Remove the Input Module from the rear of the instrument Open the Input Module and connect a Platinum RTD conforming t...

Page 153: ...send and receive serial data 2 Switch OFF power to the instrument and disconnect all high voltage inputs 3 Remove the ten terminal Digital I O connector from the rear of the instrument and all extern...

Page 154: ...st 3 Jumper input 0 to ground by connecting the ground test lead to the input 0 test lead Then send the following command to Hydra DIO_LEVELS CR Verify that the returned value is 254 4 Disconnect inpu...

Page 155: ...e Totalizer input by connecting the terminal test lead to the output 0 test lead 7 Using either a terminal or a computer running a terminal emulation program set up Hydra to toggle turn ON and OFF Dig...

Page 156: ...om the rear of Hydra Open the Input Module and jumper the H high terminal of channels 1 2 and 3 together Connect a test lead to the H of channel 1 Also jumper the L low terminals of channel 1 2 and 3...

Page 157: ...H L H L H L H L H L H L H L H L H L H L INPUT MODULE USE STACKED BANANA JACKS 0 1 2 3 TR 0 1 2 3 4 5 6 7 9 16 V DC PWR 30V ALARM OUTPUTS DIGITAL I O ALARM OUTPUT CONNECTOR V 300V MAX REVIEW LAST COM F...

Page 158: ...T then MON TRIGS The display shows TRIG Then press either the up or down arrow buttons until the display shows ON Finally press ENTER 6 Press the Hydra SCAN button Hydra should scan channels 0 through...

Page 159: ...e calibrated by an automated instrumentation system Once the instrument is in calibration mode closed case calibration can be made for the four calibration groups Volts DC Volts AC Resistance and Freq...

Page 160: ...dra Users Manual for complete information about these computer interface commands CLS ESE ESE ESR IDN OPC OPC RST SRE SRE STB TRG WAI IEE IEE IER LOCS LWLS REMS RWLS 4 21 Using Hydra Starter Calibrati...

Page 161: ...rper tipped object such as a pencil 7 On the PC use the right and left arrow keys to select CAL Then press the ENTER key A message asking if you want to calibrate is displayed Press Y and ENTER The ne...

Page 162: ...N arrow key to select the Clear to Send flow control OFF Then press ENTER e With ECHO displayed use the UP or DOWN arrow key to select ON Then press ENTER Communications setup for Hydra is nowcomplete...

Page 163: ...dc and wait 4 seconds CAL_STEP Hydra computes calibration constant 3 and returns the calibrated reading CAL_REF 2 9000E 0 You output 2 9V dc and wait 4 seconds CAL_STEP Hydra computes calibration cons...

Page 164: ...ding CAL_REF 2 9000E 0 You output 2 9V at 1 kHz from the 5700A and wait 8 seconds CAL_STEP Hydra computes calibration constants 10 and 11 and returns the calibrated reading For software versions lower...

Page 165: ...hermocouple and a mercury thermometer in a stable thermally isolated room temperature bath Allow 20 minutes for thermal stabilization 7 Select the temperature function and K thermocouple type for chan...

Page 166: ...H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L H L HYDRA INPUT MODULE HI HI LO LO HI SENSE V AUX CURRENT GUARD GROUND WIDEBAND 5700A NC NC OUTPUT V A 5700A HYDRA SENSE SENSE...

Page 167: ...ns lower than 5 4 this step computes calibration constant 15 CAL_REF 290 00E 3 You source 290000 CAL_STEP Hydra computes calibration constant 18 and returns the calibrated reading For software version...

Page 168: ...ttle CAL_REF xxxxx xxx CAL_STEP Hydra computes calibration constant 17 and returns the calibrated reading For software versions lower than 5 4 this step computes calibration constant 15 Source 190 kil...

Page 169: ...rmware Download Use the following procedure to set up the 2635A and the PC before attempting to download firmware to the instrument 1 Copy the files from the diskette to your PC hard drive All followi...

Page 170: ...d line switches The command line syntax is LD2635 B Cn Fname where the command line switches are defined as follows B Execute in batch mode program exits when firmware programming is complete If batch...

Page 171: ...5 12 AC Volts Troubleshooting 5 17 5 13 Ohms Troubleshooting 5 18 5 14 Digital Kernel Troubleshooting 5 19 5 15 Digital and Alarm Output Troubleshooting 5 21 5 16 Digital Input Troubleshooting 5 21 5...

Page 172: ...HYDRA Service Manual 5 2 5 28 Failure to Detect Memory PCA 5 29 5 29 Failure to Store Data 5 29...

Page 173: ...y The information offered in the following paragraphs serves only as an introduction to SMT It is not recommended that repair be attempted based only on the information presented here Refer to the Flu...

Page 174: ...rs might not appear on the display Therefore the following additional methods exist for accessing error information The computer interfaces can be used to determine self check statususing the TST quer...

Page 175: ...t configuration The instrument configuration information stored in nonvolatile RAM A1U3 has been corrupted The Cyclic Redundancy Checksum on this memory is not correct for the information stored there...

Page 176: ...wer supply loading is suspected disconnect the Display PCA at A1J2 If this action solves the loading problem proceed to Display Assembly Troubleshooting elsewhere in this section Otherwise refer to Po...

Page 177: ...26 TRIG P60 P61 OPS P62 EEDO P63 EEDI P64 DTR P65 PFAIL P66 EECS P67 NC Vcc A15 A47 A14 P46 P45 A13 P44 A12 P43 A11 P42 A10 P41 A9 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 60 59 58 57 56 55...

Page 178: ...ing and will not be able to complete a scan operation 5 8 5 Volt Switching Supply Use an oscilloscope to troubleshoot the 5 volt switching supply With the oscilloscope common connected to A1TP1 check...

Page 179: ...ltages across the current sense resistors are as follows 2620A Instrument without options 28 mV 2620A Instrument with IEEE 488 Option 50 mV 2625A Instrument 28 mV 5 9 Inverter Use an oscilloscope to t...

Page 180: ...imits Shorts and heavy loads between VDD and COM VSS and COM and VDD and VSS will cause one or both supplies to go into current limit The current supplied by either supply can be checked by measuring...

Page 181: ...ng and Troubleshooting 2620A 2625A Power Supply Troubleshooting 5 5 11 TP9 AND TP10 2V DIV 2 S DIV 2V DIV 2 S DIV FET GATE SIGNAL FET DRAIN SIGNAL Q7 Q8 OR T1 1 OR 3 0 0 s34f eps Figure 5 3 Inverter F...

Page 182: ...ontroller A3U9 Error C means that the Analog Measurement Processor A3U8 is not functioning properly Check the inguard power supplies on the Main PCA with and without the A D Converter PCA connected Th...

Page 183: ...proximately 4 5V 5V switcher supply is in current limit with very low duty cycle ON time near 0 1 Q or Q output of A1U22 stuck high A1U23 pin 8 output stuck high or low Shorted A1CR7 Shorted A1CR9 eit...

Page 184: ...e RESET Check for this reset pulse 5 35V VDD to near 0V lasting approximately 1 ms on A3TP1 with respect to A3TP9 Check for the following inguard to outguard communication activity PCA Test Point To P...

Page 185: ...IN OSC0 MRST AS AR SK CS BRS 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 FA0 FAI AFI MOF AF0 RA RA0 VREF VREF B3 B1 B 3 B 1 SUM INT VSS RA A3U...

Page 186: ...RIRQ1 FC0 FC1 FC2 FC3 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 OTCEN OTC K16R 27 K16S 28 K17R 29 K17S 30 K15R 31 K15S 32 33 34 35 36 37 38 K8R 39 K8S 40 K9R 41 K9S 42 K10R 43 60 K13S 59 K13R...

Page 187: ...A3L4 A3L24 A3K1 A3K14 A3R35 A3R43 and A3U8 pin 11 Table 5 4 DC Volts HI Troubleshooting Checkpoint Signal Description Possible Fault A3R11 HI Input A3K1 through A3K14 A3U4 A3U5 A3U11 A3U12 A3L1 A3L2...

Page 188: ...ange as listed in Table 5 6 If a high input impedance meter is not available only the 30 k and lower ranges can be checked Table 5 6 Ohms Open Circuit Voltage Range Voltage 300 3 k 30 k 300 k 3 M 10 M...

Page 189: ...hether the 6303Y Microprocessor is attempting to access ROM LIR A1U4 64 should transition for a short period of time after reset If it does the 6303Y Microprocessor is probably operational and the pro...

Page 190: ...ar 50 millisecond interrupt at the IRQ output A1U2 9 If this output is low and never goes high the Microprocessor A1U4 is failing to recognize the interrupt or the microprocessor interface to A1U2 is...

Page 191: ...he Input Buffer is a 100 Hz square wave that is the inverse of the input signal If the Input Buffer does not function correctly the problem is probably A1Z1 A1Z3 or the associated comparator A1AR2 or...

Page 192: ...S21 S15 S13 S11 S9 S7 S5 S3 S1 S18 S16 S14 S12 S10 S8 S6 S4 S2 2 1 A2TP2 A2TP2 A2TP3 A2TP6 A2TP4 A2TP1 A2TP5 A2TP3 A2TP6 A2TP4 A2TP1 A2TP5 U1 J1 LS1 TEST POINT LOCATIONS DISPLAY PCA s39f eps Figure 5...

Page 193: ...se all display segments to be initialized to on DTEST is connected to test points A2TP4 and LTE is connected to A2TP5 Either test point can be jumpered to VCC A2TP6 or GND A2TP3 to select other displa...

Page 194: ...DS1 These signals should be 5 4V ac with FIL2 biased to be about 6 8V dc higher than the VLOAD supply nominally a 23 2V dc level FIL1 and FIL2 should be 180 degrees out of phase If the dc bias of FIL2...

Page 195: ...iculty recognizing front panel button presses the switch scanning signals SWR1 through SWR6 A1U4 21 through 26 respectively should be checked When no switch contacts are being closed the switch scanni...

Page 196: ...nd to Hydra again Calibration of Hydra utilizes a simple calibration by function approach If you suspect calibration errors but the instrument does not exhibit the symptoms mentioned above verify that...

Page 197: ...etailed descriptionof IDN Table 5 9 Calibration Faults for software versions 5 4 and above Input Range Calibration Constant Related Components Number Acceptable Values DC Volts 0 09000V 0 9000V 0 2900...

Page 198: ...00V 0 2900V 2 9000V 29 000V 290 00V 300 mV 300 mV 3V 3V 30V 300V 7 8 9 10 11 12 0 001 to 0 001 1 0040 to 1 1840 0 01 to 0 01 1 0040 to 1 1840 1 0040 to 1 1840 1 0040 to 1 1840 A3U6 A3VR1 A3Z1 A3Z2 A3Z...

Page 199: ...heck signals D0 D7 A0 A2 RD WR MEM and RESET The short may be due to a CMOS input that has been damaged due tostatic discharge the short is then detectable only when the circuitis powered up Use an os...

Page 200: ...ery scan If the outputs of the Page Register and the Byte Counter are showing reasonable activity verify that these signals are also being received by the Nonvolatile Memories A6U6 and A6U7 Check CS W...

Page 201: ...oubleshooting 5A 17 5A 13 Ohms Troubleshooting 5A 17 5A 14 Digital Kernel Troubleshooting 5A 18 5A 15 Digital and Alarm Output Troubleshooting 5A 21 5A 16 Digital Input Troubleshooting 5A 21 5A 17 Tot...

Page 202: ...Detect Insertion of Memory Card 5A 31 5A 29 Failure to Power Card Illuminate the Busy Led 5A 31 5A 30 Failure to Illuminate the Battery Led 5A 31 5A 31 Failure to Write to Memory Card 5A 32 5A 32 Wri...

Page 203: ...e used Unique servicing troubleshooting and repair techniques are required to support this technology The information offered in the following paragraphs serves only as an introduction to SMT It is no...

Page 204: ...ot be reported in the normal displayed manner Other errors might not appear on the display Therefore the following additional methods exist for accessing error information If boot is displayed at powe...

Page 205: ...RAM location is not the same as the pattern written the test fails Error 4 Display Power up Test Failure Error 5 Display Not Responding The display processor automatically performs a self check on po...

Page 206: ...remove the Memory Card Interface A6 from the Hydra Databucket 2635A Refer to Section 3 of this manual for removal procedures If removal of this assembly results in improved instrument operation refer...

Page 207: ...PB9 PB8 WDOG PB11 IAC RMC CS3 CS2 GND CS1 CS0 FC2 FC1 V DD FC0 A1 A2 A3 GND A4 A5 A6 A7 A8 A9 A10 A11 GND A12 A13 A14 A15 TXD1 TCLK1 RCLK1 VDD RTS1 RTS3 CD3 BRG1 NC3 BUSW DISCPU FRZ DONE DACK DREQ PA...

Page 208: ...ge is greater than 8 volts dc the power fail output A1U10 5 should be high If the power fail output is near 0V dc during normal operation the Microprocessor will sense that power is failing and will n...

Page 209: ...5 1V peak and a period of about 18 us The negative going trailing edge of both square waves is slower than the rising edge and has a small bump at about 1 5 volts The signal at A1U22 3 TP14 is a symme...

Page 210: ...HYDRA Service Manual 5A 10 TP9 AND TP10 2V DIV 2 S DIV 2V DIV 2 S DIV FET GATE SIGNAL FET DRAIN SIGNAL Q7 Q8 OR T1 1 OR 3 0 0 s45f eps Figure 5A 3 Inverter FET Drive Signals 2635A...

Page 211: ...to the A D Converter PCA at A3J10 The inguard regulator circuits and VDDR regulator will operate with no loads and troubleshooting can be performed by making voltage measurements The normal input curr...

Page 212: ...cher supply is in current limit with very low duty cycle ON time near 0 1 Q or Q output of A1U22 stuck high A1U23 pin 8 output stuck high or low Shorted A1CR7 Shorted A1CR9 either diode pins 1 3 or 2...

Page 213: ...measured with a high input impedance oscilloscope or timer counter the oscillator output at A3TP10 should be a 3 6864 MHz sine wave 271 3 ns period and the divided down E clock output at A3U9 pin 68 s...

Page 214: ...Q1 FC0 FC1 FC2 FC3 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 OTCEN OTC K16R 27 K16S 28 K17R 29 K17S 30 K15R 31 K15S 32 33 34 35 36 37 38 K8R 39 K8S 40 K9R 41 K9S 42 K10R 43 60 K13S 59 K13R 58...

Page 215: ...SC0 MRST AS AR SK CS BRS 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 FA0 FAI AFI MOF AF0 RA RA0 VREF VREF B3 B1 B 3 B 1 SUM INT VSS RA A3U8 AN...

Page 216: ...resemble the waveform shown in Figure 5A 6 A3TP13 TO A3TP9 0 1V DIV 5 mS DIV s48f eps Figure 5A 6 Integrator Output 2635A Check for channel relay operation by setting up a channel and selecting and de...

Page 217: ...in 1 Input A3R11 A3C31 A3K15 A3U6 pin 13 Amplified X 2 5 input A3U7 A3Z3 A3Q3 through A3Q9 A3C15 A3C16 A3R24 A3A25 A3R26 A3R27 A3R28 A3C23 A3U6 A3Q13 A3U8 A3Z1 pin 2 DC equivalent of original input A3...

Page 218: ...dc VCC If this signal is present check for a similar waveform at pinA1U25 30 of the FPGA If a 12 288 MHz square wave is not presentthere resistor A1R107 is probably bad If the SCLK signal A1TP11 is so...

Page 219: ...ess data lines from the MC68302 Microprocessor Verify that the XINIT output A1U25 65 goes high after RESET goes high Verify that the mode pins and extra chip select input on the FPGA A1U25 are properl...

Page 220: ...correct one of the following error messages may be seen Bad rom pointer Invalid pointer to checksum structure Bad checksum pointer Invalid pointer to instrument checksum Bad checksum Incorrect instrum...

Page 221: ...croprocessor operates very much like the interface to NVRAM device A1U20 5A 15 Digital and Alarm Output Troubleshooting Power up Hydra while holding down the CANCL button to reset the instrument confi...

Page 222: ...S6 S7 S0 S1 S2 S3 S4 S5 S6 S7 CLK A1 A23 AS UDS LDS R W DTACK D8 D15 D0 D7 WORD READ ODD BYTE READ EVEN BYTE READ WORD AND BYTE READ CYCLE TIMING DIAGRAM A0 S0 S1 S2 S3 S4 S5 S6 S7 S0 S1 S2 S3 S4 S5 S...

Page 223: ...mined that the Display Assembly is faulty Refer to Figure 5A 8 for Display PCA test points This initial determination may not be arrived at easily since an improperly operating display may be the resu...

Page 224: ...1 S15 S13 S11 S9 S7 S5 S3 S1 S18 S16 S14 S12 S10 S8 S6 S4 S2 2 1 A2TP2 A2TP2 A2TP3 A2TP6 A2TP4 A2TP1 A2TP5 A2TP3 A2TP6 A2TP4 A2TP1 A2TP5 U1 J1 LS1 TEST POINT LOCATIONS DISPLAY PCA s50f eps Figure 5A 8...

Page 225: ...BIT 4 BIT 3 BIT 2 BIT 1 BIT 0 s54f eps Figure 5A 9 Display Controller to Microprocessor Signals 2635A REVIEW REM SCAN x1 k EXT SET FUNC mV TR 1 s51f eps Figure 5A 10 Display Test Pattern 1 2635A LAST...

Page 226: ...from A2U1 may not be connected properly to A2DS1 Grids are numbered from 10 to 0 left to right as the display is viewed For a digit to be enabled the respective grid drive signals GRID 10 0 must be a...

Page 227: ...alibration step has failed Hydra remains on that step so that the output from the calibration source may be corrected or the calibration reference value CAL_REF being used by Hydra may be changed if i...

Page 228: ...9 000V 290 00V 100 mV 1V 300 mV 3V 30V 300V 1 2 3 4 5 6 1 0315 to 1 1565 1 0340 to 1 1540 1 0315 to 1 1565 1 0315 to 1 1565 1 0340 to 1 1640 1 0290 to 1 1590 A3VR1 A3Z2 A3VR1 A3Z2 A3VR1 A3Z2 A3VR1 A3Z...

Page 229: ...set 18 19 0x3F8A7F291 08200563 Volt AC Gain 20 21 0xBC3A6C00 0 011378330 Volt AC Offset 22 23 0x3F8A863A1 082221330 Volt AC Gain 24 25 0xBDE81400 0 1133194150 300 Volt AC Offset 26 27 0x3F8AC8861 0842...

Page 230: ...ly when the circuit is powered up Use an oscilloscope to check activity on each of the interface signals Verify that signals are able to transition normally between 0 and 5 0V dc VCC 5A 27 Failure to...

Page 231: ...ng a storage oscilloscope Verify that the gate of transistor A6Q1 is driven low by A6U1 26 check both ends of resistor A6R13 When the gate of A6Q1 is near 0 volts dc the drain of transistor A6Q1 5 thr...

Page 232: ...ad CRD and card write CWR signals must go low for read and write cycles respectively The following table describes the memory card access modes to attribute memory only read accesses are done by the i...

Page 233: ...SERTED The Memory Card Controller doesn t recognize that the memory card is inserted in connector A6P1 Verify that A6U1 19 and A6U1 21 are both near 0 volts dc MEMORY CARD IS WRITE PROTECTED The Memor...

Page 234: ...HYDRA Service Manual 5A 34...

Page 235: ...6 1 Chapter 6 List of Replaceable Parts Title Page 6 1 Introduction 6 3 6 2 How to Obtain Parts 6 3 6 3 Manual Status Information 6 3 6 4 Newer Instruments 6 4 6 5 Service Centers 6 4 6 6 6 4...

Page 236: ...HYDRA Service Manual 6 2...

Page 237: ...the Fluke Parts Dept by calling 1 800 526 4731 Parts price information is available from the Fluke Corporation or its representatives Prices are also available in a Fluke Replacement Parts Catalog whi...

Page 238: ...other countries 6 6 Note This instrument may contain a Nickel Cadmium battery Do not mix with the solid waste stream Spent batteries should be disposed of by a qualified recycler or hazardous materia...

Page 239: ...RMAL CASE BOTTOM 874107 1 MP3 ISOTHERMAL CASE TOP 874110 1 MP4 SEAL CALIBRATION 735274 1 MP5 DECAL REAR PANEL 874128 1 MP6 ROD POWER SWITCH 784827 1 MP7 LABEL CE MARK SILVER 600715 1 MP10 CHASSIS ASSY...

Page 240: ...2 1 TM3 HYDRA DATA BUCKETSERVICE MANUAL 202231 0 5 TM4 HYDRA DATA LOGGER MANUAL 891457 0 5 TM5 HYDRA USERS MANUAL GERMAN 919220 0 5 TM6 HYDRA USERS MANUAL FRENCH 885991 0 5 W1 WIRE ASSY GROUND 874099...

Page 241: ...05 see Table 6 6 for replacement parts 1 MP48 MP20 MP7 MP22 MP6 F1 F2 MP35 H54 2620A 2625A T B 1 of 3 MP1 H51 MP13 MP23 MP47 MP17 A1 H53 H70 H50 A2 MP12 MP11 MP59 MP15 MP14 MP4 A5 Option for 2625A A6...

Page 242: ...HYDRA Service Manual 6 8 H52 Ref A1 Ref W2 Ref Bottom View 2620A 2625A T B 2 of 3 s56f eps Figure 6 1 2620A 2625A Final Assembly cont...

Page 243: ...List of Replaceable Parts Service Centers 6 6 9 2620A 2625A T B 3 of 3 H52 Ref W1 T1 Ref A3 Top View s57f eps Figure 6 1 2620A 2625A Final Assembly cont...

Page 244: ...HYDRA Service Manual 6 10 A4 MP3 A4 H65 MP2 MP66 MP67 2620A 100 s58f eps Figure 6 1 2620A 2625A Final Assembly cont...

Page 245: ...L CASE TOP 874110 1 MP4 SEAL CALIBRATION 735274 1 MP5 DECAL REAR PANEL 874128 1 MP6 ROD POWER SWITCH 784827 1 MP10 CHASSIS ASSY 871561 1 MP7 LABEL CE MARK SILVER 600715 1 MP11 PANEL FRONT 932058 1 MP1...

Page 246: ...DATA BUCKET SERVICE MANUAL 889589 1 3 TM4 HYDRA DATA BUCKET USERS MANUAL FRENCH 931902 1 3 TM5 HYDRA DATA BUCKET USERS MANUAL GERMAN 931907 1 3 W1 WIRE ASSY GROUND 874099 1 W2 CABLE ASSY FLAT 20 COND...

Page 247: ...ters 6 6 13 2635A T B 1 of 3 H52 H52 H53 MP7 MP22 MP47 H54 MP13 MP23 H51 MP1 MP18 MP998 MP48 MP5 H52 MP101 MP10 MP16 H50 A2 MP12 MP11 MP59 MP15 MP14 W2 H70 T1 A3 MP35 MP101 F1 F2 MP6 A6 W3 A1 MP17 s59...

Page 248: ...HYDRA Service Manual 6 14 2635A T B 2 of 3 Bottom View W3 Cable Assembly A1 H52 Ref A6 MP102 Part of W2 s60f eps Figure 6 2 2635A Final Assembly cont...

Page 249: ...List of Replaceable Parts Service Centers 6 6 15 2635A T B 3 of 3 Top View W1 H52 T1 Ref A3 s61f eps Figure 6 2 2635A Final Assembly cont...

Page 250: ...HYDRA Service Manual 6 16 A4 MP3 A4 H65 MP2 MP66 MP67 2620A 100 s62f eps Figure 6 2 2635A Final Assembly cont...

Page 251: ...UF 20 100V SOLV PROOF 837492 1 C30 C31 CAP AL 47UF 20 50V SOLV PROOF 822403 2 C35 C53 CAP CER 1000PF 5 50V C0G 1206 867408 2 C39 CAP CER 0 047UF 10 100V X7R 844733 1 CR1 CR10 DIODE SI 60 PIV 3 AMP SCH...

Page 252: ...5K 5 125W 200PPM 746628 2 R38 RES JUMPER 0 02 0 25W 682575 1 R39 RES CERM 63 4K 1 125W 100PPM 836627 1 R40 RES CERM 5 1K 5 125W 200PPM 746560 1 R41 RES CERM 11K 1 125W 100PPM 867291 1 R43 RES CERM 39K...

Page 253: ...3 1 U19 IC VOLT REG ADJ 1 2 TO 32 V 0 1 A 810242 1 U20 IC CMOS 12 STAGE BIN RIPPLE CNTR SOIC 831636 1 U21 IC CMOS TRIPLE 3 INPUT NAND GATE SOIC 867978 1 U22 IC CMOS DUAL D F F EDG TRG SOIC 782995 1 U2...

Page 254: ...HYDRA Service Manual 6 20 2620A 1601 s63f eps Figure 6 3 2620A 2625A A1 Main PCA...

Page 255: ...17 CAP AL 2 2UF 20 50V 769687 1 C26 CAP AL 47UF 20 100V SOLV PROOF 837492 1 C30 C31 C66 C67 CAP AL 47UF 20 50V SOLV PROOF 822403 822403 4 C35 C53 C74 CAP CER 1000PF 5 50V C0G 1206 867408 3 C39 CAP CER...

Page 256: ...M 3 32K 1 125W 100PPM 810788 1 R7 R16 R35 RES CERM 100K 5 125W 200PPM 740548 3 R8 R21 RES CERM 270 5 125W 200PPM 746354 2 R9 R10 R39 R41 R71 R77 R83 RES CERM 4 7K 5 125W 200PPM 740522 740522 740522 7...

Page 257: ...REG SWITCHING 100KHZ 5A TO 220 929591 1 U10 IC CMOS MICROPROCESSOR SUPERVISOR DIP 913975 1 U11 GAL PROGRAMMED I O DECODER 931910 1 U12 IC CMOS PARALLEL I O CAL CLCK 914036 1 U13 IC CMOS RS232 DRIVER...

Page 258: ...HYDRA Service Manual 6 24 2635A 1601 s64f eps Figure 6 4 2635A A1 Main PCA...

Page 259: ...1 MP102 DISPLAY PWB ASSY SM 873901 1 MP321 WIRE JUMPER TEF 22AWG WHT 300 528257 1 R1 R10 R12 RES CERM 10K 5 125W 200PPM 746610 3 R2 RES CERM 2 2M 5 125W 200PPM 811778 1 R3 RES CERM 1 2M 5 125W 200PPM...

Page 260: ...HYDRA Service Manual 6 26 2620A 4002 CKT 1 CKT 2 s65f eps Figure 6 5 A2 Display PCA...

Page 261: ...1 C35 38 CAP CER 180PF 10 50V C0G 1206 769778 4 CR1 CR2 CR4 DIODE SI BV 70V IO 50MA DUAL SOT 23 742320 3 J1 CONN DIN41612 TYPE C RT ANG 48 PIN 867333 1 J2 CONN MICRO RIBBON PLUG RT ANG 20 POS 876107 1...

Page 262: ...0 1 U1 IC COMPARATOR QUAD 14 PIN SOIC 741561 1 U3 IC CMOS DUAL D F F EDG TRG SOIC 782995 1 U4 U5 U10 12 IC ARRAY 7 NPN DARLINGTON PAIRS SOIC 821009 5 U6 IC BPLR TRUE RMS TO DC CONVERTER 707653 1 U7 IC...

Page 263: ...List of Replaceable Parts Service Centers 6 6 29 2620A 1603 K3 K5 K14 Relay Polarity Install with marked end as shown Aromat or Nais Omron s66f eps Figure 6 6 A3 A D Converter PCA...

Page 264: ...NPUT CONNECTOR PWB 873815 1 P1 CONN DIN41612 TYPE R RT ANG 48 SCKT 867338 1 P2 CONN MICRO RIBBON REC RT ANG 20 POS 876102 1 Q1 TRANSISTOR SI NPN TMP SENSR SEL TO 92 741538 1 R1 RES MF 5 49K 1 0 125W 1...

Page 265: ...List of Replaceable Parts Service Centers 6 6 31 2620A 1604 s67f eps Figure 6 7 A4 Analog Input PCA...

Page 266: ...100CTR 24 PIN 831834 1 R1 RES CERM 5 1K 5 125W 200PPM 746560 1 TP1 TERM UNINSUL WIRE FORM TEST POINT 781237 1 U1 IC NMOS GPIB CONTROLLER PLCC 887190 1 U2 IC LSTTL OCTAL GPIB XCVR SOIC 831651 1 U3 IC L...

Page 267: ...List of Replaceable Parts Service Centers 6 6 33 2620A 1605 s68f eps Figure 6 8 A5 IEEE 488 Interface PCA Option 05...

Page 268: ...512590 1 TP1 TP2 TERM UNINSUL WIRE FORM TEST POINT 781237 2 U1 IC CMOS OCTAL D TRANSPARNT LATCH SOIC 876235 1 U2 IC CMOS QUAD 2 INPUT AND GATE SOIC 853317 1 U3 IC CMOS DUAL DIV BY 16 BIN CNTR SOIC 837...

Page 269: ...List of Replaceable Parts Service Centers 6 6 35 2625A 1606 s69f eps Figure 6 9 2625A A6 Memory PCA...

Page 270: ...P2 HEADER 2 ROW 050CTR RT ANG 40 PIN 838540 1 Q1 TRANSISTOR SI P MOS 2W SOIC 914031 1 R1 R3 R4 R8 RES CERM 10K 5 125W 200PPM 746610 4 R2 R5 R7 R9 R12 R14 R16 R17 RES CERM 47K 5 125W 200PPM 746685 7466...

Page 271: ...List of Replaceable Parts Service Centers 6 6 37 2635A 1606 s70f eps Figure 6 10 2635A A6 Memory Card I F PCA...

Page 272: ...HYDRA Service Manual 6 38...

Page 273: ...7 5 7 10 Installing the IEEE 488 Option 7 7 7 11 Performance Testing 7 7 7 12 Troubleshooting 7 8 7 13 Power Up Problems 7 8 7 14 Communication Problems 7 8 7 15 Failure to Select IEEE 488 Option 7 8...

Page 274: ...HYDRA Service Manual 7 2...

Page 275: ...nector the IEEE 488 Controller and the IEEE 488 Transceivers and Connector These three blocks are described in the following paragraphs Refer to Section 8 for a schematic diagram of the IEEE 488 PCA P...

Page 276: ...he IEEE 488 Controller generates an interrupt to the Microprocessor These interrupts are generated by driving the open drain interrupt output A5U1 10 low This signal drives the IRQ2 input to the Micro...

Page 277: ...iver Receiver Receiver Transmitter Transmitter Receiver Receiver Transmitter Transmitter Receiver Receiver ATN 0 Transmitter ATN 1 Transmitter Receiver Receiver Receiver Receiver 7 8 General Maintenan...

Page 278: ...nual 7 6 CHASSIS REAR BEZEL CASE IEEE 488 PCA 6 32 1 4 INCH PANHEAD SCREW REMOVE PLASTIC PLUG FROM CASE RETAINING SCREWS 24 LINE RIBBON CABLE ASSEMBLY MOUNTING SCREW 2 GROUNDING SCREW s53f eps Figure...

Page 279: ...IA cls clear instrument status 200 ON SRQ GOTO 530 enable SRQ interrupt 210 PRINT IA cls sre 16 idn SRQ on Message Available 220 WAIT 500 FOR SRQ allow time to execute commands 230 IF S 0 THEN 260 240...

Page 280: ...oftware there may be a problem with the OPS signal The IEEE option grounds the OPS signal A5J1 22 which is normally pulled up to VCC on the instrument Main PCA The Microprocessor determines that the I...

Page 281: ...ify that each of these signals passes through A5U2 and A5U3 properly 7 20 Failure to Generate an End or Identify EOI When the IEEE 488 option sends the Line Feed termination character at the end of a...

Page 282: ...HYDRA Service Manual 7 10...

Page 283: ...1 A1 Main PCA 2620A 2625A 8 3 8 2 A1 Main PCA 2635A 8 8 8 3 A2 Display PCA 8 14 8 4 A3 A D Converter PCA 8 16 8 5 A4 Analog Input PCA 8 20 8 6 A5 Option 05 IEEE 488 Interface PCA 8 22 8 7 A6 Memory P...

Page 284: ...HYDRA Service Manual 8 2...

Page 285: ...Schematic Diagrams 8 8 3 Figure 8 1 A1 Main PCA 2620A 2625A 2620A 1601 s88f eps...

Page 286: ...VDDR PFAIL C O M VSS SHLD G N D VCC VEE VLOAD FIL1 FIL2 DIO W R R D RESET E D 7 0 VCC G N D TRIG A 15 0 TOTALIZE D C H DCL SHEET 3 D C H DCL SHEET 2 INTERCONNECT DIAGRAM SHEET 4 A01AR1 A01AR2 A01AR3 A...

Page 287: ...IN OUT ADJ 1 30K R44 1 0 C34 TP7 10K R48 047 C39 H C U 0 4 VR4 LM385 R39 63 4K 11 0K R41 LM393DT U24 39K R43 H C U 0 4 H C U 0 4 H C U 0 4 R45 1 0M 10K R42 VCC CR13 MMBD7000 47 C31 U18 79L05 GND OUT...

Page 288: ...Schematic Diagrams 8 8 6 Figure 8 1 A1 Main PCA 2620A 2625A cont 2620A 1001 3 of 4 s73f eps...

Page 289: ...15K H C 8 6 Z1 55K 350K 4 7K R35 15K R36 1 C29 LM358DT AR1 Z1 55K 350K Z1 55K 350K Z1 55K 350K Z1 55K 350K AR3 LM324D ULN2004 U17 ULN2004 U27 Z3 47K C45 180PF AR3 LM324D Z1 55K 350K AR2 LM324D AR3 LM...

Page 290: ...6 7 11 12 7 11 13 16 4 16 28 52 53 66 77 93 7 1 24 32 32 9 12 14 4 1 POWER SUPPLY PIN NUMBERS GND COM 18 28 39 62 72 74 83 99 112 131 14 4 4 8 4 2 20 1 16 32 16 32 3 6 27 29 41 54 55 56 79 91 16 VCC 5...

Page 291: ...0 47 C31 2200 C14 FLUKE45 6401 T2 LM317T U 6 IN OUT ADJ CR12 BAS16 D HC74 CL Q Q PR R47 10K 1000PF C35 U18 LM79L05A G N D OUT IN HCU04 HCU04 HCU04 HCU04 CR11 BAS16 R28 470 R34 470 R40 5 1K M M B D 7 0...

Page 292: ...Schematic Diagrams 8 8 10 2635A 1001 2 of 5 Figure 8 2 A1 Main PCA 2635A cont s76f eps...

Page 293: ...Schematic Diagrams 8 8 11 2635A 1001 3 of 5 Figure 8 2 A1 Main PCA 2635A cont s77f eps...

Page 294: ...D5 IO D6 IO D7 IO TCLKIN IO XTL1 BCLKIN IO XTL2 IO CCLK M0 RTRIG M1 RDATA M2 IO RDY BUSY RCLK IO RESET P W R D W N U25 XC3030 70PQ100C J2 VCC VCC 1 C60 1 C19 VCC 10K R42 VCC 10K R64 10K R70 R85 47 R87...

Page 295: ...57 47 R56 47 R49 470 R58 470 9 1K R37 3 6K R36 ULN2004 U17 ULN2004 U17 ULN2004 U17 ULN2004 U17 ULN2004 U17 ULN2004 U17 ULN2004 U27 ULN2004 U27 ULN2004 U27 ULN2004 U27 ULN2004 U27 ULN2004 U27 ULN2004 U...

Page 296: ...Schematic Diagrams 8 8 14 2620A 4002 CKT 1 CKT 2 Figure 8 3 A2 Display PCA s90f eps...

Page 297: ...agrams 8 8 15 2620A 1002 REF DES A2U1 A2U4 A2U5 A2U6 A2Z1 21 16 10 16 14 16 42 2 8 8 7 9 10 4 5 POWER SUPPLY PIN NUMBERS VCC 5 1V dc VEE 5 0V dc VLOAD 28 5 to 30 0V dc GND Figure 8 3 A2 Display PCA co...

Page 298: ...Schematic Diagrams 8 8 16 2620A 1603 K3 K5 K14 Relay Polarity Install with marked end as shown Aromat or Nais Omron Figure 8 4 A3 A D Converter PCA s91c eps...

Page 299: ...8 A3U9 A3U10 A3U11 A3U12 A3U13 A3U14 A3Z1 A3Z2 A3Z3 3 1 16 1 10 11 12 13 14 1 5 6 9 36 8 8 1 10 11 12 6 9 2 7 1 3 4 3 4 25 27 38 2 45 4 4 8 9 9 9 9 9 8 8 8 8 8 POWER SUPPLY PIN NUMBERS VCC 5 3V dc ANA...

Page 300: ...Schematic Diagrams 8 8 18 2620A 1003 2 of 3 Figure 8 4 A3 A D Converter PCA cont s82c eps...

Page 301: ...Schematic Diagrams 8 8 19 2620A 1003 3 of 3 Figure 8 4 A3 A D Converter PCA cont s83c eps...

Page 302: ...Schematic Diagrams 8 8 20 2620A 1604 Figure 8 5 A4 Analog Input PCA s92f eps...

Page 303: ...11 12 13 14 15 5 7 9 3 5 7 9 11 13 15 1 2 4 6 8 10 12 14 1 2 RGRD CB2 CB1 CH20_LO CH20_LO CH20_HI CH20_HI CH19_LO CH19_LO CH19_HI CH19_HI CH18_LO CH18_LO CH18_HI CH18_HI CH17_LO CH17_LO CH17_HI CH17_...

Page 304: ...Schematic Diagrams 8 8 22 2620A 1605 Figure 8 6 A5 IEEE 488 Interface PCA 2620A Only s93f eps...

Page 305: ...matic Diagrams 8 8 23 2620A 1005 REF DES VCC 5 1V dc 3 44 20 20 14 A5U1 A5U2 A5U3 A5U4 22 10 11 10 1 2 4 5 7 9 10 GND POWER SUPPLY PIN NUMBERS Figure 8 6 A5 IEEE 488 Interface PCA 2620A Only cont s85c...

Page 306: ...Schematic Diagrams 8 8 24 2625A 1606 Figure 8 7 A6 Memory PCA 2625A s94f eps...

Page 307: ...grams 8 8 25 2625A 1006 REF DES VCC 5 1V dc 20 14 14 5 14 32 32 16 A6U1 A6U2 A6U3 A6U4 A6U5 A6U6 A6U7 A6U8 1 10 7 12 13 7 3 12 7 16 16 5 8 GND POWER SUPPLY PIN NUMBERS Figure 8 7 A6 Memory PCA 2625A c...

Page 308: ...20 21 31 41 51 61 71 81 91 101 105 111 7 2 4 6 7 8 10 A6U1 A6U2 A6U3 16 27 46 60 76 106 107 113 116 120 14 20 GND POWER SUPPLY PIN NUMBERS Lasted Used Not Used C9 DS2 P2 Q1 R15 TP1 U3 Z3 C DS P Q R TP...

Page 309: ...RWISE SPECIFIED 2 ALL RESISTOR VALUES ARE IN OHMS 1 ALL CAPACITOR VALUES ARE IN MICROFARADS NOTES 4 THIS DRAWING IS ARCHIVED ON 3 ALL RESISTOR ARE 1 8W 5 SEE SCD 2635A C90006 TAPE 2635A C97006 MT 7 3...

Page 310: ...Schematic Diagrams 8 8 28...

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