Keithley 2701 Service Manual Download Page 132

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Keithley Instruments, Inc.

Cleveland, Ohio 44139

DRN.
CKD.
APP.

DATE
DATE
DATE

PART NUMBER

LTR

REVISIONS

APP. DATE

FORM 28777A-SBG

BRUNING 40-21 62198-SBG

PURCHASED ITEM

SPECIFICATIONS

HW 8/01/02

Revision A

Page 1 of 3

2701 Ethernet Multimeter/Data Acquisition System

DC CHARACTERISTICS

CONDITIONS: MED (1 PLC)

or 10 PLC or MED (1 PLC) with Digital Filter of 10

TEST

INPUT

ACCURACY: ±(ppm of r ppm of range)

CURRENT ±5%

RESISTANCE

(ppm = parts per million) (e.g., 10ppm = 0.001%)

TEMPERATURE

OR BURDEN

OR OPEN CKT.

24 Hour

90 Day

1 Year

COEFFICIENT

FUNCTION

RANGE

RESOLUTION

VOLTAGE

23°C±1°

23°C±5°

0°–18°C & 28°–50°C

Voltage

100.0000 mV

0.1 µV

>10 G

Ω

15 + 30

25 + 35

30 + 35

(1 + 5)/°C

1.000000

1.0 µV

>10 G

Ω

15 + 6

25 + 7

30 + 7

(1 + 1)/°C

10.00000

10 µV

>10 G

Ω

10 + 4

20 + 5

30 + 5

(1 + 1)/°C

100.0000

100 µV

10 M

Ω

± 1%

15 + 6

35 + 9

45 + 9

(5 + 1)/°C

1000.000

1 mV

10 M

Ω

± 1%

20 + 6

35 + 9

50 + 9

(5 + 1)/°C

Resistance

6, 8

100.0000

Ω

100 µ

Ω

1 mA

6.9 V

20 + 20

80 + 20

100 + 20

(8 + 1)/°C

1.000000 k

Ω

1 m

Ω

1 mA

6.9 V

20 + 6

80 + 6

100 + 6

(8 + 1)/°C

10.00000 k

Ω

10 m

Ω

100 µA

6.9 V

20 + 6

80 + 6

100 + 6

(8 + 1)/°C

100.0000 k

Ω

100 m

Ω

10 µA

12.8 V

20 + 6

80 + 10

100 + 10

(8 + 1)/°C

1.000000 M

Ω

1.0

Ω

10 µA

12.8 V

20 + 6

80 + 10

100 + 10

(8 + 1)/°C

10.00000 M

Ω

0.7 µA // 10M

Ω

7.0 V

150 + 6

200 + 10

400 + 10

(70 + 1)/°C

100.0000 M

Ω

100

Ω

0.7 µA // 10M

Ω

7.0 V

800 + 30

2000 + 30

(385 + 1)/°C

Continuity (2W)

1.000 k

Ω

100 m

Ω

1 mA

6.9 V

40 + 100

100 + 100

(8 + 1)/°C

Current

20.00000 mA

10 nA

< 0.2

60 + 30

300 + 80

500 + 80

(50 + 5)/°C

100.0000 mA

100 nA

< 0.1

100 + 300

300 + 800

500 + 800

(50 + 50)/°C

1.000000

1.0 µA

< 0.5

200 + 30

500 + 80

800 + 80

(50 + 5)/°C

3.000000

10 µA

< 1.5

1000 + 15

1200 + 40

(50 + 5)/°C

Channel (Ratio)

Ratio Accuracy = Accuracy of selected Channel Range + Accuracy of Paired Channel Range

Channel (Average)

Average Accuracy = Accuracy of selected Channel Range + Accuracy of Paired Channel Range

TEMPERATURE

(Displayed in °C, °F, or K. Exclusive of probe errors.)

Thermocouples (Accuracy based on ITS-90.)

90 Day/1 Year (23°C ± 5°C)

Relative to

Using

Temperature

Simulated

77xx

Coefficient

Type

Range

Resolution Reference Junction

Module

0°–18°C & 28°–50°C

–200 to +760 °C

0.001°C

0.2°C

1.0°C

0.03°C/°C

–200 to +1372°C

0.001°C

0.2°C

1.0°C

0.03°C/°C

–200 to +1300°C

0.001°C

0.2°C

1.0°C

0.03°C/°C

–200 to +400°C

0.001°C

0.2°C

1.0°C

0.03°C/°C

–200 to +1000°C

0.001°C

0.2°C

1.0°C

0.03°C/°C

0 to +1768°C

0.1

°C

0.6°C

1.8°C

0.03°C/°C

0 to +1768°C

0.1

°C

0.6°C

1.8°C

0.03°C/°C

+350 to +1820°C

0.1

°C

0.6°C

1.8°C

0.03°C/°C

4-Wire RTD:
(100

Ω

platinum [PT100], D100, F100, PT385, PT3916, or user type. Offset compensation On)

–200° to

630°C

0.01 °C

0.06°C

0.003°C/°C

Thermistor: (2.2k

Ω

, 5k

Ω

, and 10k

Ω

)

–80° to

150°C

0.01 °C

0.08°C

0.002°C/°C

DC SYSTEM SPEEDS

15,18

RANGE CHANGES

50/s (42/s) (excludes 4 Wire Ohms).

FUNCTION CHANGES

50/s (42/s).

AUTORANGE TIME

<30ms.

ASCII READINGS TO RS-232 (115.2k BAUD):

300/s.

MAX. EXTERNAL TRIGGER RATE:

2000/s.

DC MEASUREMENT SPEEDS

Single Channel, 60Hz (50Hz) Operation

FUNCTION

DIGITS

READINGS/s

PLCs

DCV, DCI,

Ω

(<10M),

6.5

12,16

(4)

Thermocouple,

6.5

(28)

Thermistor

6.5

12,16

(48)

5.5

12,16

150

(120)

0.1

5.5

16, 17

300

(240)

0.1

5.5

500

(400)

0.1

4.5

3000 (3000)

0.006

3.5

3500 (3500)

0.002

Ω

(<10M)

6.5

1.4

(1.1)

6.5

(12)

5.5

16, 17

(25)

0.1

Ω

OComp, RTD

6.5

16, 17

0.9

(0.7)

6.5

16, 17

(6.4)

5.5

16, 17

18 (14.4)

0.1

Channel (Ratio),

6.5

16, 17

2.5

(2)

Channel (AVG)

6.5

16, 17

(12)

5.5

16, 17

(20)

0.1

Multiple Channels Into Memory

15, 18

7710 Scanning DCV

500/s

7703 Scanning DCV

390/s

7703 Scanning DCV with Limits or Time Stamp On

390/s

7703 Scanning DCV alternating 2W

Ω

95/s

Multiple Channels, Into and Out of Memory

15, 16, 17, 18

Channels/s

7710 Scanning DCV

440/s

7703 Scanning DCV

360/s

7703 Scanning DCV with Limits or Time Stamp On

360/s

7703 Scanning DCV alternating 2W

Ω

90/s

7702 Scanning DCV

75/s

7700 and 7708 Scanning Temperature (T/C)

60/s

SPEC-2701

Summary of Contents for 2701

Page 1: ...Model 2701Ethernet Based DMM Data Acquisition System Service Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 2: ...ONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS INC HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES SUCH EXCLUDED DAM AGES SHALL...

Page 3: ...DMM Data Acquisition System Service Manual 2002 Keithley Instruments Inc All rights reserved Cleveland Ohio U S A First Printing June 2002 Document Number 2701 902 01 Rev A Title Page fm Page 1 Thurs...

Page 4: ...ld incorporate immediately into the manual Addenda are numbered sequentially When a new Revision is created allAddenda associated with the previous Revision of the manual are incorporated into the new...

Page 5: ...ected to mains voltage or to voltage sources with high tran sient over voltages Installation Category II connections require protection for high transient over voltages often associated with localAC m...

Page 6: ...ersonal contact with these voltages The WARNING heading in a manual explains dangers that might result in personal injury or death Always read the associated information very carefully before performi...

Page 7: ...ication 1 8 Verifying DC voltage 1 8 Verifying AC voltage 1 10 Verifying DC current 1 12 Verifying AC current 1 13 Verifying resistance 1 14 Verifying temperature 1 16 Verifying frequency 1 18 Model 7...

Page 8: ...22 Model 7700 calibration 2 22 3 Routine Maintenance Introduction 3 2 Setting the line voltage and replacing the line fuse 3 2 Replacing the front terminal AMPS fuse 3 4 Replacing Model 7700 plug in...

Page 9: ...ving power components 5 6 Instrument reassembly 5 7 Input terminal wire connections 5 7 Power module wire connections 5 7 6 Replaceable Parts Introduction 6 2 Parts lists 6 2 Ordering information 6 2...

Page 10: ...eous calibration commands B 4 CODE B 4 COUNt B 4 INIT B 5 LOCK B 5 LOCK B 6 SAVE B 6 DATE B 7 NDUE B 7 DATA B 8 DC calibration commands B 9 STEP1 B 9 STEP2 B 10 STEP3 B 10 STEP4 B 10 STEP5 B 11 STEP6...

Page 11: ...DE B 18 COUNt B 18 DATE B 19 INIT B 19 LOCK B 20 LOCK B 20 RCOunt B 20 SAVE B 21 STEP0 B 21 Remote error reporting B 22 Error summary B 22 Error queue B 24 Status byte EAV Error Available bit B 24 Det...

Page 12: ...ections for Model 7700 resistance verification 100 to 10M ranges 1 25 Figure 1 13 Connections for Model 7700 resistance verification 100M range 1 27 Figure 1 14 Connections for Model 7700 thermocouple...

Page 13: ...15 Plug in module four wire RTD temperature verification reading limits 1 30 2 Calibration Table 2 1 Recommended equipment for comprehensive calibration 2 5 Table 2 2 Comprehensive calibration proced...

Page 14: ...Table 4 16 2 signal multiplexing and gain 4 18 Table 4 17 4 signal multiplexing and gain 4 18 Table 4 15 DCA signal multiplexing and gain 4 18 Table 4 18 Switching device locations 4 19 5 Disassembly...

Page 15: ...1 PerformanceVerification...

Page 16: ...t is still under warranty and its performance is outside specified limits contact your Keithley representative or the factory to determine the correct course of action If the unit is not under warrant...

Page 17: ...2701 to warm up for at least two hours before conducting the verification procedures If the instrument has been subjected to temperature extremes those outside the ranges stated above allow additional...

Page 18: ...pm 100V 90ppm 700V 85ppm 20mA 60ppm 100mA 70ppm 1A 110ppm 2 2A 94ppm 1A 690ppm 2 2A 682ppm 100 17ppm 1k 12ppm 10k 11ppm 100k 13ppm 1M 18ppm 10M 37ppm 100M 120ppm Fluke 5725A Amplifier AC Voltage 50kHz...

Page 19: ...s 9 99965V to 10 00035V Calculating resistance reading limits Resistance reading limits must be recalculated based on the actual calibration resistance values supplied by the equipment manufacturer Ca...

Page 20: ...to test Model 2701 accuracy through the front panel terminals Model 7700 verification Use this procedure to test accuracy through any of the available plug in modules with the same functions as the Mo...

Page 21: ...llowing safety precautions when performing these tests Some of the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are enco...

Page 22: ...the FRONT position NOTE Use shielded low thermal connections when testing the 100mV and 1V ranges to avoid errors caused by noise or thermal effects Connect the shield to the calibrator s output LO t...

Page 23: ...verification tests 5 Source positive and negative and full scale voltages for each of the ranges listed in Table 1 2 For each voltage setting be sure that the reading is within stated limits Table 1...

Page 24: ...igure 1 2 Be sure the INPUTS switch is in the FRONT position Figure 1 2 Connections for Model 2701 AC volts verification Model 2701 Ethernet Multimeter Data Acquisition System RANGE F 500V PEAK FRONT...

Page 25: ...imits Table 1 3 ACV reading limits ACV range Applied AC voltage 1kHz reading limits 1 year 18 C to 28 C 50kHz reading limits 1 year 18 C to 28 C 100mV 1V 10V 100V 750V 100 0000mV 1 000000V 10 00000V 1...

Page 26: ...1 4 DCI limits DCI range Applied DC current Reading limits 1 year 18 C to 28 C 20mA 100mA 1A 3A 20 0000mA 100 0000mA 1 000000A 3 000000A 19 98840 to 20 011160mA 99 8700 to 100 1300mA 0 999120 to 1 00...

Page 27: ...zed in Table 1 5 and verify that the readings are within stated limits Table 1 5 ACI limits ACV range Applied AC voltage Reading limits 1kHz 1 year 18 C to 28 C 1A 3A 1 000000A 3 00000A 0 99860 to 1 0...

Page 28: ...wire resistance function by pressing the 4 key then choose the SLOW integration rate with the RATE key 4 Set the Model 2701 for the 100 range and make sure the FILTER is on Enable OCOMP offset compen...

Page 29: ...590 to 10 00410M 99 7970 to 100 2030M __________ to __________ __________ to __________ k __________ to __________ k __________ to __________ k __________ to __________ M __________ to __________ M __...

Page 30: ...R The unit displays the sensor type SENS TCOUPLE c Make sure that TCOUPLE is displayed then press ENTER The unit then displays the thermocouple type TYPE K d Select a type J temperature sensor then pr...

Page 31: ...lays the sensor type SENS TCOUPLE c Using the cursor and range keys set the display as follows SENS 4W RTD d Press ENTER and note the unit displays TYPE PT100 e Using the cursor and range keys set the...

Page 32: ...imilar capabilities Refer to the Model 2701 User s Manual for specific information on ter minals and connections for other plug in modules Verifying DC voltage Check DC voltage accuracy by applying ac...

Page 33: ...0mV DC and allow the reading to settle 5 Enable the Model 2701 REL mode Leave REL enabled for the remainder of the DC volts verification tests 6 Source positive and negative and full scale voltages fo...

Page 34: ...t because instrument damage may occur Follow these steps to verify AC voltage accuracy 1 Connect the Model 7700 CH1 H and L INPUT terminals to theAC voltage calibrator as shown in Figure 1 9 Figure 1...

Page 35: ...ranges summarized in Table 1 10 and make sure that the respective Model 2701 readings fall within stated limits 6 Press the OPEN key to open Channel 1 Table 1 10 Plug in module ACV reading limits ACV...

Page 36: ...y 1 Connect the Model 7700 CH21 H and L terminals to the calibrator as shown in Figure 1 10 Figure 1 10 Connections for Model 7700 DC current verification H L H L AMPS H L H L H L H L H L H L LO CH21...

Page 37: ...Source positive and negative full scale currents for each of the ranges listed in Table 1 11 and verify that the readings for each range are within stated limits 6 Press the OPEN key to open Channel 2...

Page 38: ...current function by pressing the ACI key 4 Set the Model 2701 for the 1A range Close Channel 21 by pressing the CLOSE key and keying in 121 5 Source 1A and 3A 1kHz full scaleAC currents as summarized...

Page 39: ...4 wire configuration connect the Model 7700 CH1 H and L INPUT terminals and CH11 H and L SENSE terminals to the calibrator as shown in Figure 1 12 Figure 1 12 Connections for Model 7700 resistance ve...

Page 40: ...e values 7 Source the nominal full scale resistance values for the 100 10M ranges summarized in Table 1 13 and verify that the readings are within calculated limits Table 1 13 Limits for plug in modul...

Page 41: ...e 100M range 12 Press the OPEN key to open Channel 1 Figure 1 13 Connections for Model 7700 resistance verification 100M range H L H L AMPS H L H L H L H L H L H L LO CH21 CH22 CH11 CH12 CH13 CH14 CH1...

Page 42: ...ctions as shown in Figure 1 14 2 Install the Model 7700 in Slot 1 of the Model 2701 then turn on the power and allow the unit to warm up for two hours before proceeding Be sure the front panel INPUTS...

Page 43: ...191 0 to 189 0 C 1 0 to 1 0 C 749 0 to 751 0 C 191 0 to 189 0 C 1 0 to 1 0 C 1349 0 to 1351 0 C Voltages shown are based on ITS 90 standard H L H L AMPS H L H L H L H L H L H L LO CH21 CH22 CH11 CH12...

Page 44: ...re sensor 0 00385 as follows a Press SHIFT then SENSOR and note the unit displays the temperature units UNITS C b Press ENTER and note the unit displays the sensor type SENS TCOUPLE c Using the cursor...

Page 45: ...t the function generator to output a 1kHz 1V RMS sine wave 4 Select the Model 2701 frequency function by pressing the FREQ key Close Channel 1 by pressing the CLOSE key and keying in 101 5 Verify that...

Page 46: ...e Model 2701 DCV function and the 1V range Close Channel 1 by pressing the CLOSE key and keying in 101 4 Select the Model 2701 RATIO function press SHIFT then RATIO 5 Set the calibrator output to 1 00...

Page 47: ...2 Calibration...

Page 48: ...DC only and AC only calibration may be performed individually if desired Environmental conditions Conduct the calibration procedures in a location that has An ambient temperature of 18 to 28 C 65 to...

Page 49: ...f the procedures in this section may expose you to dangerous voltages Use standard safety precautions when such dangerous voltages are encountered to avoid personal injury or death caused by electric...

Page 50: ...lt code is 002701 Use the left and right arrow keys to move among the digits use the up range key to increment numbers and press the down range key to specify alphabetic letters Confirm the code by pr...

Page 51: ...u need for comprehensive DC only and AC only calibration procedures You can use alternate equipment such as a DC transfer stan dard and characterized resistors as long as that equipment has specificat...

Page 52: ...ration Setting calibration dates and saving calibration Preparing the Model 2701 for calibration 1 Turn on the Model 2701 and allow it to warm up for at least two hours before perform ing a calibratio...

Page 53: ...ng prompt OPEN CIRCUIT 4 Remove the calibration short and press ENTER During this phase the CALIBRATING message will be displayed NOTE Be sure to minimize movement near front Input terminals Excessive...

Page 54: ...ense off 3 Perform the steps listed in Table 2 3 to complete DC volts calibration For each calibra tion step Set the calibrator to the indicated value and make sure it is in OPERATE Press the ENTER ke...

Page 55: ...m the calibration steps summarized in Table 2 4 For each step Set the calibrator to the indicated value and place the unit in operate If the cali brator cannot output the exact resistance value use th...

Page 56: ...u are performing DC only calibration proceed to Setting calibration dates and saving calibration Table 2 5 DC current calibration summary Calibration step Calibrator current Allowable range 10mA 100mA...

Page 57: ...AC at 50kHz 1V AC at 1kHz 1V AC at 50kHz 10V AC at 1kHz 10V AC at 50kHz 100V AC at 1kHz 100V AC at 50kHz 700V AC at 1kHz 10 00000mV 1kHz 100 0000mV 1kHz 100 0000mV 50kHz 1 000000V 1kHz 1 000000V 50kH...

Page 58: ...calibration date and the calibration due date Set these dates as follows 1 At the CAL DATE prompt use the left and right arrow keys and the range keys to set the calibration date then press ENTER 2 Th...

Page 59: ...on DC current calibration AC voltage calibration AC current calibration Programming calibration dates Saving calibration constants Locking out calibration NOTE As with front panel calibration you can...

Page 60: ...which could affect calibration accuracy DC voltage calibration After the front panel short and open steps perform the following 1 Connect the calibrator to the Model 2701 as shown in Figure 2 2 Allow...

Page 61: ...indicated programming command Change the command parameter if you are using a different calibration resistance than that shown Wait until the Model 2701 completes each step before continuing Table 2 8...

Page 62: ...current if possible Send the indicated programming command Change the current parameter if you are using a different calibration current Wait until the Model 2701 completes each step before continuin...

Page 63: ...the Model 2701 completes each step before continuing Table 2 11 AC voltage calibration programming steps Calibration step Calibrator voltage frequency Calibration command 10mV AC at 1kHz 100mV AC at...

Page 64: ...lowing commands CAL PROT DATE year month day CAL PROT NDUE year month day For example the following commands assume calibration dates of 12 15 1999 and 12 15 2000 respectively CAL PROT DATE 1999 12 15...

Page 65: ...enerator to complete the comprehensive calibration steps Calibration card preparation Before performing manufacturing calibration short the HI LO SHI and SLO terminals of TE100 on the Model 7797 Calib...

Page 66: ...N then enter the appropriate calibration code default 002701 4 Select ALL at the CAL RUN prompt 5 Press ENTER to perform the first manufacturing calibration step 6 Perform the entire front panel compr...

Page 67: ...Press and hold the OPEN key while turning on the power 3 Enable calibration by sending the CODE command For example the default command is CAL PROT CODE KI002701 4 Initiate calibration by sending the...

Page 68: ...700 make sure that power has been removed from the card for at least two hours to allow card circuitry to cool down After turning on the power during the calibration procedure complete the procedure a...

Page 69: ...power off install the Model 7700 7797 combination in Slot 1 and select the rear inputs with the INPUTS switch Allow three minutes for thermal equilibrium 3 Accurately measure and record the cold temp...

Page 70: ...3 RoutineMaintenance...

Page 71: ...ollowing steps 1 Place the tip of a flat blade screwdriver into the power module by the fuse holder assembly see Figure 3 1 Gently push in and to the left Release pressure on the assembly and its inte...

Page 72: ...0 mm slow blow FU 106 315 Model 2701 ETHERNET 10 100 BaseT KEITHLEY SLOT COVER TRIG LINK 10bT 100bT WARNING NO INTERNAL OPERATOR SERVICABLE PARTS SERVICE BY QUALIFIED PERSONNEL ONLY CAUTION FOR CONTIN...

Page 73: ...nd replace it with the same type 3A 250V fast blow Keithley part number FU 99 1 CAUTION Do not use a fuse with a higher current rating than specified or instrument damage may occur If the instrument r...

Page 74: ...ing by removing the two bottom screws Figure 3 3 Model 7700 amps fuses 5 De solder the blown CH21 or CH22 fuse as required taking care not to damage the cir cuit board or spread solder flux around the...

Page 75: ...t perform this procedure unless you are qualified to do so Disconnect the line cord and all connecting wires from the Model 2701 before removing the top cover WARNING The precautions below must be fol...

Page 76: ...d this query via remote ROUTe CLOSe COUNt clist Here clist is the summary of channels For example to determine the closure count of channels 1 and 4 of a module in slot 1 the following query would be...

Page 77: ...e a channel is closed regardless of how it was closed by a SCPI command front panel control or during a scan These counts are permanently written to the EEPROM on the card only at a user settable time...

Page 78: ...4 Troubleshooting...

Page 79: ...oards are built using surface mount techniques and require specialized equipment and skills for repair If you are not equipped and or qualified it is strongly recommended that you send the unit back t...

Page 80: ...are upgrade mode as indicated by FW UPGRADE message Depend ing on the failure mode firmware upgrades can be performed through the port s listed in the table You can also force the unit into the firmwa...

Page 81: ...XIT tests the EXIT key However the second consecutive press of EXIT aborts the test and returns the instrument to normal operation DISP test The display test allows you to verify that each segment and...

Page 82: ...igure 4 4 Ohms open lead sense detection block diagram Power supply The following information provides some basic circuit theory that can be used as an aid to troubleshoot the power supply A block dia...

Page 83: ...are shown in the digital circuitry block diagram in Figure 4 2 Microcontroller U401 is the display board microcontroller that controls the display and interprets key data The microcontroller uses thre...

Page 84: ...e Figure 4 3 Display Board Controller U401 Display DS401 Flash Memory U6 SDRAM U3 50 MHz XTAL Y1 RS 232 U15 RS 232 Port Ethernet Interface U12 10 100 BaseT Ethernet Port Keypad Slot Control Battery Co...

Page 85: ...croprocessor using proprietary encoding schemes Digital circuitry Refer to Figure 4 2 for the following discussion on digital circuitry Main microprocessor U1 is an MCF5407 microprocessor that oversee...

Page 86: ...igital I O U23 and U24 make up the digital input output Digital I O is controlled by the FPGA U9 under MPU supervision Module slot control U13 and U21 make up the control circuitry that allows communi...

Page 87: ...gnal switching for DCV and OHMS is done by the DCV Ohms Switching circuit FETs Q113 Q105 Q104 and Q108 connect the DCV or ohms signal to the X1 buffer U113 Note that the reference current for OHMS is...

Page 88: ...3 Q124 Q125 Q126 U123 U133 DCV Ohms Switching Q104 Q105 Q108 Q113 X1 Buffer U113 Digital Circuitry See Figure 4 2 ADC U165 A D MUX Gain U129 U132 U163 U166 SENSE HI ACV FREQ AMPS DCA ACA Slot Control...

Page 89: ...second type of open sense lead detection is implemented in software This function works for the SENSE HI and SENSE LO leads The SENSE HI and SENSE LO leads will drift negative when disconnected due to...

Page 90: ...in when front panel key is pressed Use front panel display test Digital 5V supply Display 37V supply Microcontroller RESET Controller 4MHz clock Control from main processor Key down data sent to main...

Page 91: ...tal common 3 3V 3 3VD supply 4 2V 4 2V Low on power up then goes high Check for stuck bits Check for stuck bits 50MHz Pulse train during RS 232 I O Pulse train during RS 232 I O 500Hz signal Verify th...

Page 92: ...switched to Pin 9 Pin 3 switched to Pin 2 K101 and K102 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 8 2 signal switching Range Q101 Q102 Q114 Q136 Q109 K101 K102 Q113 Q105 Q104...

Page 93: ...F OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON OFF OFF ON ON K101 set states Pin 8 switched to Pin 7 Pin 3 switched to Pin 4 Table 4 10 2 4 reference switching Range U133 0 7V U133 7V Q123 Q12...

Page 94: ...r stage U166 Table 4 12 ACA signal switching Range K103 U105 pin 16 U105 pin 1 U111 pin 16 U105 pin 8 U103 pin 16 U103 pin 1 1A 3A Reset Reset ON ON ON ON OFF ON OFF OFF OFF OFF OFF OFF K103 set state...

Page 95: ...163 U129 pin 1 U129 pin 8 U129 pin 9 Gain U166 100 1k 10k 100k 1M 10M 100M S4 S4 S4 S4 S4 S4 S4 OFF OFF OFF OFF ON ON ON OFF ON ON ON OFF OFF OFF ON OFF OFF OFF OFF OFF OFF 100 10 10 10 1 1 1 Table 4...

Page 96: ...n the block diagram Table 4 18 Switching device locations Switching devices Analog circuit section see Figure 4 3 Q101 Q102 Q114 Q136 Q109 K101 Q113 Q105 Q104 Q108 Q121 K102 U103 U105 U111 U133 Q119 Q...

Page 97: ...5 Disassembly...

Page 98: ...ing precautions when handling PC boards Wear cotton gloves Only handle PC boards by the edges and shields Do not touch any board traces or components not associated with repair Do not touch areas adja...

Page 99: ...grounded work station Also ground yourself with a suitable wrist strap Handle the devices only by the body do not touch the pins Ground any printed circuit board into which a semiconductor device is t...

Page 100: ...he left ear to the left side of the chassis Each ear is marked RIGHT or LEFT on its inside surface 3 Remove Rear Bezel To remove the rear bezel loosen the two captive screws that secure the rear bezel...

Page 101: ...al screw is near the rear panel next to J5 During re assembly replace the board and start the RS 232 and Digital I O connector nuts and the mounting screw Tighten all the fasteners once they are all i...

Page 102: ...Remove the two nuts that secure the transformer to the side of the chassis 3 Pull the black ground wire off the threaded stud and remove the power transformer from the chassis Power module removal Pe...

Page 103: ...n installing the power transformer be sure to reconnect the black ground wire to the mounting stud on side of the chassis Be sure to install the bot tom case screws to assure a good case to chassis gr...

Page 104: ......

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Page 111: ...6 ReplaceableParts...

Page 112: ...representative or the factory see inside front cover for addresses When ordering parts be sure to include the following information Instrument model number Model 2701 Instrument serial number Part de...

Page 113: ...1000 C132 CAP 220PF 10 100V CERAMIC C 451 220P C137 CAP 33PF 5 100V CERAMIC C 465 33P C141 C158 C176 C195 C219 C220 C222 C261 CAP 47P 5 100V CERAMIC C 465 47P C143 C144 C151 C159 C160 C258 C260 CAP 1...

Page 114: ...34 C55 C59 CAP 01uF 20 50V CERAMIC C 418 01 C70 C211 CAP 100U 20 16V ALUM ELEC C 547 100 C71 C212 CAP 100P 10 100V CERAMIC C 451 100P C91 C101 C107 C116 C118 C122 C124 C125 CAP 1UF 20 50V CERAMIC C 41...

Page 115: ...CHANNEL JFET SST4118 TG 347 Q119 TRANS P CHANNEL JFET J270 J177 TG 166 Q135 Q137 Q148 TRANS N CHANNEL JFET SNJ132199 TG 294 Q14 TRANS P CHAN MOSFET TP0610T TG 259 Q2 Q4 Q111 Q116 Q129 Q144 Q146 Q8 Q9...

Page 116: ...FILM R 418 499 R158 RES 1 1 3W R 475 1 R159 R182 R272 RES 1K 1 1 4W METAL FILM R 391 1K R167 R173 R197 R256 R284 R288 R298 R340 RES 1K 1 100MW THICK FILM R 418 1K R169 R87 RES 4 75K 1 100MW THICK FILM...

Page 117: ...RES 267 1 1 2W METAL FILM R 94 267 R249 RES 4 02K 1 100MW THICK FILM R 418 4 02K R259 R320 RES 10 10 100MW THICK FILM R 418 10 R273 R274 R307 R314 RES 475 1 1 4W METAL FILM R 391 475 R277 RES 66 5K 1...

Page 118: ...35 R41 R45 R47 R49 RES 4 75K 1 100MW THICK FILM R 418 4 75K R86 R82 R83 R92 R94 R155 R162 R203 R207 RES 4 75K 1 100MW THICK FILM R 418 4 75K R9 R10 R34 RES 200 1 100MW THICK FILM R 418 200 R91 RES 56...

Page 119: ...W OPEN DRAIN OUTPUT IC 1479 U141 IC PRECISION REFERENCE LM399 196 600A U142 IC OP AMP NE5534D IC 802 U144 IC 5V 3 0A LOW DROPOUT REGULATOR IC 1519 U148 U153 IC QUAD 2 IN NOR 74HCT02 IC 809 U149 IC NC...

Page 120: ...BIT 70NS 3 3V FRAM LSI 291 1 U805 U807 UHS CONFIGURABLE 2 INPUT GATE IC 1492 U9 FPGA 2 5V LSI 292 1 VR102 DIODE ZENER 6 0V BZX84B6V2 DZ 87 VR103 VR104 DIODE ZENER 6 8V MMSZ5235BT1 DZ 100 VR105 VR106 V...

Page 121: ...RES 15k 1 100MW THICK FILM R 418 15K R405 R408 R410 R412 RES 12 1 1 1 4W METAL FILM R 391 12 1 R413 RES 13K 1 100MW THICK FILM R 418 13K R419 RES 10M 5 125MW METAL FILM R 375 10M R420 R421 RES 10K 1 1...

Page 122: ...ANEL 2001 302H 1 DISPLAY LENS 2701 311A 1 SLOT COVER 2750 321A 1 BEZEL REAR 428 303D 2 FOOT 428 319A 1 MOUNTING EAR RIGHT 428 328E 1 MOUNTING EAR LEFT 428 338B 1 POWER ROD 704 313A 1 BATTERY LITHIUM I...

Page 123: ...ILICON TG 388 Q35 37 39 41 43 45 47 48 TRANS NPN SILICON TG 389 Q5 P CHANNEL TMOSFET TG 392 Q8 10 12 14 16 18 20 22 24 26 28 30 32 TRANS PNP SILICON TG 388 Q9 11 13 15 17 19 21 23 25 27 29 31 33 TRANS...

Page 124: ...DABLE SERIAL EEPROM LSI 212 U24 IC QUAD 2 IN AND 74HCT08 IC 837 U6 IC 8 CHAN ANA MULTIPLEXER DG408DY IC 844 U7 U25 IC POS NAND GATES INV 74HCT14 IC 656 U9 U10 IC DUAL OPTO IC 1358 TOP COVER HEAT STAKE...

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Page 131: ...A Specifications...

Page 132: ...rs Thermocouples Accuracy based on ITS 90 90 Day 1Year 23 C 5 C Relative to Using Temperature Simulated 77xx Coefficient Type Range Resolution Reference Junction Module 0 18 C 28 50 C J 200 to 760 C 0...

Page 133: ...C 0 4 0 6 1 2 0 5 1 0 B 350 to 1100 C 0 8 0 3 1 7 0 5 1 0 20 For lead resistance 0 add the following uncertainty for measurement temperatures of 70 100 C 100 150 C 2 2 k 44004 0 22 C 1 11 C 5 0 k 4400...

Page 134: ...uto Zero off 10 Sample count 1000 11 DETector BANDwidth 300 with nPLC 0 006 12 Maximum useful limit with trigger delay 175ms 13 Includes measurement and data transfer out ethernet Reading Element only...

Page 135: ...0 Source 50 Load 0 1dB below 1MHz 3dB below 2MHz COMMON MODEVOLTAGE 300V between any terminal and chassis T C COLD JUNCTION 1 0 C 18 28 C Mainframe Temp 1 5 C 0 18 C 28 50 C Mainframe Temp ENVIRONMENT...

Page 136: ...from 4 9998V to 5 0002V DC current and resistance calculations are performed in exactly the same manner using the pertinent specifications ranges and input signal values Calculating AC characteristic...

Page 137: ...characteristics accuracy it can be shown that a measurement of 0 998815V on the 1V range has an uncertainty of 36 9644mV or 0 998778V to 0 998852V using one year specifications Expressing 0 998778V a...

Page 138: ...reading accuracy is 10mV 36mV or 10 036mV to 9 964mV Applying the voltage reading accuracy into the dB equation yields Thus the actual reading accuracy is 60dB 0 031213dB to 60dB 0 031326dB dBm and dB...

Page 139: ...AC current Select 6 digits 10 PLC filter ON up to 100 readings fixed range Temperature Select 6 digits 10 PLC filter ON up to 100 readings Optimizing measurement speed The configurations listed below...

Page 140: ...B CalibrationReference...

Page 141: ...ueries and CODE CODE up to 8 char string Calibration code or password default KI002701 COUNt Request the number of times the unit has been calibrated INITiate Initiate calibration LOCK Lock out calibr...

Page 142: ...P7 10V AC at 50kHz step STEP8 100V AC at 1kHz step STEP9 100V AC at 50kHz step STEP10 700V AC at 1kHz step STEP11 100mA AC at 1kHz step STEP12 1A AC at 1kHz step STEP13 2A AC at 1kHz step STEP14 1V AC...

Page 143: ...o the unit before sending any other comprehensive or manufacturing calibration command The default calibration code is KI002701 NOTES The CODE command should be sent only once before performing either...

Page 144: ...performing either DC AC or factory calibration Do not send INIT before each calibration step Example CAL PROT INIT Initiate calibration LOCK CALibration PROTected LOCK Purpose To lock out comprehensi...

Page 145: ...Request cal lock state SAVE CALibration PROTected SAVE Purpose To save calibration constants in EEROM after the calibration procedure Format cal prot save Parameter None Description The SAVE command s...

Page 146: ...and day parameters must be delimited by commas Example CAL PROT DATE 1999 12 16 Send cal date 12 16 1999 CAL PROT DATE Request cal date NDUE CALibration PROTected NDUE Purpose To send the next calibra...

Page 147: ...alibration constants data Format cal prot data Response Floating point ASCII values separated by commas Description The DATA query requests all the calibration constants Values are returned in one str...

Page 148: ...jacks before sending this command Example CAL PROT DC STEP1 Perform short circuit calibration Table B 2 DC calibration commands Command Description Parameter limits CALibration PROTected DC STEP1 Fro...

Page 149: ...sive calibration step Format cal prot dc step3 Cal_voltage Parameter Cal_voltage 9 to 11 V Description STEP3 programs the 10V DC comprehensive calibration step The allowable range of the calibration v...

Page 150: ...ormat cal prot dc step6 Cal_resistance Parameter Cal_resistance 900 to 1 1E3 Description STEP6 programs the 1k 4 wire resistance comprehensive calibration step The allowable range of the calibration r...

Page 151: ...tep Format cal prot dc step9 Cal_resistance Parameter Cal_resistance 900E3 to 1 1E6 Description STEP9 programs the 1M comprehensive calibration step The allowable range of the calibration resistance p...

Page 152: ...rameter is from 90E 3 to 110E 3 Use the 100E 3 value whenever possible for best results Example CAL PROT DC STEP11 100E 3 Program 100mA step STEP12 CALibration PROTected DC STEP12 Purpose To program t...

Page 153: ...V AC at 1kHz calibration step STEP2 100mV AC at 1kHz calibration step STEP3 100mV AC at 50kHz calibration step STEP4 1V AC at 1kHz calibration step STEP5 1V AC at 50kHz calibration step STEP6 10V AC a...

Page 154: ...1kHz calibration step 7 10V AC at 50kHz calibration step 8 100V AC at 1kHz calibration step 9 100V AC at 50khz calibration step 10 700V AC at 1kHz calibration step 11 100mA AC at 1kHz calibration step...

Page 155: ...The AC STEP14 and AC STEP15 commands program the two manufacturing AC calibration steps The appropriate signal must be connected to the instrument when programming each step as summarized by the param...

Page 156: ...d Description CALibration Calibration root command PROTected All commands in this subsystem are protected by the calibration lock except queries and CODE CODE up to 8 char string Send calibration code...

Page 157: ...S The CODE command should be sent only once before performing calibration Do not send CODE before each calibration step The code parameter must be enclosed in single quotes Example CAL PROT CODE KI002...

Page 158: ...vely NOTE The card calibration date is automatically set to the Model 2701 real time clock date when the card is calibrated Example CAL PROT CARD1 DATE Request card 1 cal date INIT CALibration PROTect...

Page 159: ...pose To read Model 7700 calibration lock status Format cal prot card1 lock Response 0 Calibration locked 1 Calibration unlocked Description The LOCK query requests status from the Model 2701 on Model...

Page 160: ...CARD1 SAVE Save card calibration constants STEP0 CALibration PROTected CARD1 STEP0 Purpose To perform Model 7700 calibration Format cal prot card1 step0 temp Parameter temp Cold calibration temperatur...

Page 161: ...le error 404 100 vdc full scale error 405 100 vdc full scale error 406 1k 2 w zero error 407 10k 2 w zero error 408 100k 2 w zero error 409 10M 2 w zero error 410 10M 2 w full scale error 411 10M 2 w...

Page 162: ...le error 466 750 vac noise error 467 Post filter offset error 468 1 aac zero error 469 1 aac full scale error 470 3 aac zero error 471 3 aac full scale error 472 Input time constant error 473 Frequenc...

Page 163: ...to see if it is set If the EAV bit is set an error has occurred and you can use the SYST ERR query to read the error and at the same time clear the EAV bit in the status byte Detecting calibration ste...

Page 164: ...oltage 2 11 code 2 4 comprehensive 2 5 considerations 2 3 cycle 2 5 DC current 2 10 DC voltage 2 8 front panel 2 6 front panel short and open 2 7 Model 7700 2 22 Model 7700 and 7706 2 22 preparing the...

Page 165: ...ry 4 8 block diagram 4 7 Digital circuitry checks 4 14 Digital I O 4 9 Disassembly 5 1 Disassembly procedures 5 4 DISP test 4 4 Display 4 8 Display board 4 6 Display board checks 4 13 E Environmental...

Page 166: ...supply components 4 6 Power transformer removal 5 6 Power on self test 4 3 R ratio and average verifying Model 7700 1 32 reading limit ACV Model 2700 1 11 calculating resistance 1 5 calculation exampl...

Page 167: ...igger circuits 4 9 Troubleshooting 4 1 V verification Model 2700 1 8 Model 7700 1 18 Verification limits 1 5 Verification test considerations 1 7 Model 2700 1 6 Model 7700 1 6 summary 1 6 verification...

Page 168: ...e 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 7500 Fax 0118 929 7519 INDIA Flat 2B Willocrissa 14 Rest House...

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