Racal Instruments 1994 User Manual Download

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Summary of Contents for 1994

Page 1: ...nue Dutartre 78150 LeChesnay France Tel 1 3955 8888 FAX 1 3955 6735 Racal Systems Elettronlca Sri Strada 2 Palazzo C4 20090 Milanofiori Assago Milan Italy Tel 02 5750 1 796 FAX 02 5750 1828 Racal Elek...

Page 2: ...nd to users of its products and to any other person or persons for special or consequential damages of any kind and from any cause whatsoever arising out of or in any way connected with the manufactur...

Page 3: ...ected to the ground earth protective conductor of the power outlet Do not defeat the protective feature of the third protective conductor in the power cord by using a two conductor extension cord or a...

Page 4: ......

Page 5: ...ne B6 from was to is as shown below Was Is 4 Page 7 22 PCB Assy BNC 401762 a No corrections Change Revision letter to F 5 Page 7 25 Option 04A Oscillator Assy 404392 a No corrections Change Revision l...

Page 6: ...imp FSC 22526 Manufacturer s P N 48251 000 c Change Item 24 J14 to RI P N 602193 005 Connector Cable Recept 5 Pin FSC 22526 Manufacturer s P N 65039 032 d Revision letter is now E 16 Page 8 23 Option...

Page 7: ...CONNECTOR...

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Page 9: ...ll be degraded The following statement must be added to the following procedures p 6 21 under NOTE in step 6 of paragraph 29 p 6 23 under NOTE after step 7 of paragraph 33 p 6 26 step 2 of paragraph 4...

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Page 11: ...ate Time and Resolution 1 4 1 12 External Frequency Standard Input 1 4 1 13 Standby Mode 1 4 1 14 GPIB Interface 1 4 1 15 Options Available 1 4 1 15 1 Rear Panel Input Option 01 1 15 2 Frequency Stand...

Page 12: ...rating Procedures 3 19 3 4 1 Measurement Functions 3 19 3 4 2 Trigger Level Setting 3 35 3 4 3 Display Resolution 3 37 3 4 4 Gate Time 3 38 3 4 5 Stop Arm Delay Hold Off 3 39 3 4 6 Math Function R X Y...

Page 13: ...Channel A B Block 5 3 5 3 1 1 Functional Description 5 3 5 3 1 2 Circuit Description 5 4 5 3 2 Channel C Block 5 5 5 3 2 1 Functional Description 5 5 5 3 2 2 Circuit Description 5 6 5 3 3 Measurement...

Page 14: ...l 5 3 10 1 Introduction 5 21 5 3 10 2 Address Setting and Recognition 5 21 5 3 10 3 Reading from the Bus 5_22 5 3 10 4 Writing to the Bus 5 22 5 3 10 5 Serial Poll e o j 5 3 10 6 Data Transfer Between...

Page 15: ...gram 5 13 5 8 Microprocessor Block Diagram 5 14 5 9 Standby and IRQ Block Diagram 5 16 5 10 Power Supply Block Diagram 5 19 5 11 Internal Frequency Standard Block Diagram 5 20 6 1 A Fault Finding Flow...

Page 16: ...unpHnn T ptfPr 5 4 23 4 fi Wttrh Snppd Ontniit Mndp Format 4 24 x u 4 7 Statue RvtP Fnrmflt 4 27 4 8 Pormittpd T pr rnina tore 4 29 4 9 Tnctm imont Prpcpt Prtdp 4 29 4 10 Wnmpi ipfll Tnnut Format 4 30...

Page 17: ...Figure 1 1 Model 1994 Universal Timer Counter IX ho a so CMWjl o...

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Page 19: ...sure the period of the waveform applied to Input A A resolution of 9 digits is available with a 1 second gate time 1 2 4 Time Interval 1 2 4 1 Time Interval provides single shot measurements of the ti...

Page 20: ...of the instrument s circuits to be made without the use of additional test equipment For example the 1994 can measure its own 10 MHz internal reference standard Although these tests do not check the...

Page 21: ...put A to 50 kHz nominal 1 5 MATH COMPUTATION 1 5 1 When the Math function is active the displayed value is Measurement Result X Y Z where X Y and Z are values entered into stores within the instrument...

Page 22: ...d using an external frequency standard The counter will operate from the external standard when a signal of sufficient amplitude is applied at the EXT STD INPUT BNC connector The counter reverts to in...

Page 23: ...ixed Mount Rack Option 60 1 15 5 1 This permits fixed 19 inch full rack installation of the 1994 See Subsection 2 5 2 for field installation 1 15 6 Slide Mount Rack Option 65 1 15 6 1 This permits sta...

Page 24: ...rval resolution is 1 nanosecond or 9 digits per second of measurement time Trigger levels on Inputs A and B can be set via the front panel keypad or via auto trigger at the 50 point of the input wavef...

Page 25: ...5V rms DC to 160 MHz Automatic or manual selection in the 5 IV to 5 1V range XI 51V to 51V range X10 Trigger level readout is shown on main display Automatic mode trigger points are set halfway betwe...

Page 26: ...C or DC Slope Positive or negative independently selectable Low Frequency Filter Input A only 50 kHz nominal Input Connections BNC sockets Crosstalk XI at 100 MHz 36 dB between channels measured using...

Page 27: ...signal can occur up to 2 ns before the start signal Trigger Slopes Start positive or negative Stop positive or negative LSD Displayed 1 ns 100 ps using averaging Resolution LSD 1 ns rms start trigger...

Page 28: ...REQUENCY RATIO MEASUREMENT Ranges Ratio A B Input A DC to 100 MHz Input B DC to 100 MHz LSD Displayed 10 x Ratio x Gate Time Resolution t LSD Trigger Error B Gate Time Accuracy Resolution Note Higher...

Page 29: ...cy I L_ resolution trigger level timing error see note 2 trigger level setting error at 10 trigger point trigger level setting error at 90 trigger point see note 2 2 ns differential channel delay erro...

Page 30: ...y x 360 Period A I _ MATH Applies to all counting timing measurement functions Note that the Math function is applied prior to the Statistics function Display Reading X y where X Y and Z are constants...

Page 31: ...Term 2 ppm first year Temperature Stability 10 ppm over the range 0 to 50 C referenced to 25 C External Standard Input Frequency 10 MHz Level Min 100 mV rms Max 10 V rms Max Input Level 400V peak to 5...

Page 32: ...ff state indicates the counter s self arm start stop is used Minimum Start Stop Arm Period 100 ns GATE OUT A TTL compatible signal into 1 kilohm is provided from a rear panel BNC connector coincident...

Page 33: ...mantissa TEMPERATURE PERFORMANCE Operating Temperature 0 C to 50 C Storage Temperature 40 C to 70 C POWER REQUIREMENTS These include 100 120 220 and 240V rms 10 45 to 450 Hz 10 35 VA approximately DI...

Page 34: ...Signal Level 100 mV rms sinewave min 10V rms max Maximum Input Levels 400V peak up to 500 Hz decreasing to 10V rms at 30 kHz and above Input Impedance 1 kilohm nominal for signals 1V p p decreasing to...

Page 35: ...e may be extended by one period of the input signal on Frequency B and Ratio A B two periods of the input signal on Frequency A and Period A b The resolution of phase and totalize is determined by the...

Page 36: ...Slope Trigger Level Reading Actual Trigger Point Slope Hysteresis Band xl 25 mV p p typical t ft Trigger Level Timing Error TIMING ERROR Differential Channel Delay Error 1 2 Hysteresis Band Input Sle...

Page 37: ...se fall and pulse width Setting Error 60 mV Input Slew Rate at Trigger Point Timebase Error The fractional deviation of the timebase frequency from 10 MHz due to aging temperature voltage variations e...

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Page 39: ...pping carton and the instrument s plastic foam form will provide the necessary support for safe reshipment If the original packaging is unavailable reconstruct it as much as possible Wrap the counter...

Page 40: ...2 inch towards the rear panel and lift off The top cover slides off in the same manner d Remove the four bench feet from the bottom cover by unscrewing the phillips head retaining screws from each fo...

Page 41: ...lations 2 b Flange Mount angle brackets 2 c Alignment blocks 6 d Front rack brackets 2 interchangeable e Rear rack brackets 2 f Triple rail slide mount assemblies 2 g Self Anchoring 10 32 tinner man n...

Page 42: ...TAIN I NG SCREWS 2 Figure 2 2 Rear Corner Foot Side Panel and Handle Detail 2 5 3 3 Refer to Figure 2 3 for alignment block loading Slide the alignment blocks down the center channel of the frame on e...

Page 43: ...nd secure firmly maintaining the 3 4 inch dimension to the front of the bracket NOTE Measure the distance between the front and rear mounting rails of the rack at this point If the distance is less th...

Page 44: ...Figure 2 4A B Slide Mount and Bracket Assembly 2 6...

Page 45: ...rack bracket on the front mounting rail in the same manner d Set the front dimension between the two slide mount assemblies at 16 5 8 inches e Adjust the length of the rear rack brackets to touch the...

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Page 47: ...alignment block At the same time position the flange mount angle bracket in its approximate final location in the side frame channels Align the other alignment block screw holes with their attachment...

Page 48: ...RACK BRACKET v REAR RACK BRACKET 3 1 2 INCH UNIT RAIL ALIGNMENT TOP HOLES 5 1 4 INCH UNIT RAIL ALIGNMENT BOTTOM HOLES FIRST MOUNTING HOLE ALIGNMENT BLOCKS FRONT CENTER REAR ALIGNMENT SPACER 8x 1 16 T...

Page 49: ...lock washers 2 P N 617127 c 4 flat washers 2 P N 617102 d M3 x 8 screws 2 P N 611067 2 6 1 2 Installation a Disconnect the AC power cord at the rear panel b Loosen but don t remove the two rear comer...

Page 50: ...2 P N 617102 d M3 x 8 screws 2 P N 611067 2 6 2 2 Installation a Disconnect the AC power cord at the rear panel b Loosen but don t remove the two rear corner feet by unfastening the four retaining scr...

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Page 52: ...ews two per foot Back the corner feet out approximately 5 8 inch Slide the top cover toward the rear of the unit then lift up and out to remove c Connect the Input C PCB to the motherboard at PL7 with...

Page 53: ...line fuse see Figures 2 9 and 3 2 2 7 2 Line Voltage Selection 2 7 2 1 The line voltage setting is easily changed by repositioning the small voltage selector card which is inserted vertically in its s...

Page 54: ...tion 2 7 3 Power Cord and Grounding 2 7 3 1 The front panel and instrument case are grounded in accord with MIL T 28800C protecting the user from possible injury due to shorted circuits NOTE The count...

Page 55: ...have a 0 25 A Slow Blow fuse installed 2 8 STORAGE AND TEMPERATURE 2 8 1 The 1994 can be stored at temperatures ranging from 40 C to 70 C at 75 relative humidity without adverse effects to PCBs or com...

Page 56: ...ront panel Input A connector e Press key sequence 77 SHIFT STORE SF SHIFT SF This test verifies the proper operation of Input A s input relays Confirm that the display shows 0 q Where is a blanked dig...

Page 57: ...brief self test the counter will display the instrument number 1994 for approximately two seconds followed by the software issue number 3 2 3 Home State 3 2 3 1 After self test the counter reverts to...

Page 58: ...e from 9 to 10 digits the RESOLUTION key must be held down for approximately two seconds Also the gate time may be programmed in increments rounded to the nearest 25 6 jis using the range of 200 is to...

Page 59: ...he front panel figures They show and describe front panel controls indicators and connectors NOTE In the following table LEDs shown in the Item column with an asterisk are described in their lit condi...

Page 60: ...er is supplied to the internal reference standard timebase and the LED is lit RESOLUTION Keys 44 Select the number of display digits from 3 to 10 9 with overflow Use of these keys is function dependen...

Page 61: ...ress is completed and displayed See NOTE under Reference 4 Special Function 61 causes the HOLD key to successively start and stop measure ments for manual Totalize A 7 segment LED digital display Uses...

Page 62: ...splay With 10s or greater gate times multiple overflows are possible GPIB LEDs REM LED I Counter under remote control over the GPEB interface ADDR LED Counter is being addressed as either a talker or...

Page 63: ...progress Display Unit LEDs S LED V LED FUNCTION Keys H NOTE These LEDs do not light when a phase angle ratio totalize math computation or a constant is displayed Units in Hertz for a frequency measure...

Page 64: ...ls Indicators and Connectors Cont d Input A Frequency measures frequencies to 160 MHz direct gating providing a resolution of at least 9 digits in 1 s Input B Frequency just as FREQ A except frequency...

Page 65: ...e stops negative and vice versa RATIO A B Ratio A B Ratio of Frequency A to Frequency B with frequency range of DC to 100 MHz RATIO C B Ratio C B Ratio of Frequency C to Frequency B 141 RISE FALL A Se...

Page 66: ...LL A L J Cj M wwtk a q tnirr w i t c g y y ii Reference V N Item Function Description DATA ENTRY Keys LEDs NOTE Designators for shifted key functions are underlined Also designator ISO is not used Pha...

Page 67: ...ode so that the next number entered is the exponent CE Key Clears current display and starts a new reading H9H99I Shifted Key Functions SHIFT Key LED Enables any shifted key function After pressing a...

Page 68: ...ut A by using key sequence SHIFT RECALL PEAK A Displays positive and negative signal peaks of Input B by using key sequence SHIFT RECALL PEAK B NOTE During recall of PEAK A or B the counter must be in...

Page 69: ...es are rounded off to the nearest 25 6 jus for display but can be entered in any valid step size 1SB ADDR Key Used to display the counter s GPIB address using key sequence SHIFT RECALL ADDR See Subsec...

Page 70: ...The LED lights when X10 attenuation is selected Changing the attenuation modifies the displayed trigger level by a factor of 10 1 00V XI 10 0V X10 J l Keys LEDs Toggle Input A or B s trigger slope bet...

Page 71: ...xcept Frequency C Option 41 INPUT B DC to 100 MHz is used with INPUT A for Time Interval Ratio A B Totalize and Phase measure ments Input B is used with INPUT C for Ratio C B Special Function 21 inter...

Page 72: ...the counter in the addressed mode The Talk Only switch should be in the 0 position The counter is in the Talk Only mode when the switch is set to 1 AC Power Input Socket Standard connector for the AC...

Page 73: ...ce of 1 MHz 2 MHz 5 MHz as well as 10 MHz external reference signals LEVEL ADJUST Adjustment of the trigger level for the external arming input OSC ADJ Adjustment of the internal reference frequency s...

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Page 75: ...h figures describe the basic bench functions of the 1994 NOTE Review as required Table 3 1 References 17 and 18 for use of Inputs A B and C including Special Function 21 permitting interchange of Inpu...

Page 76: ...200 jus to 99 9 s if desired For small numbers enter the gate time using the exponential format The displayed gate time will be rounded to the nearest 25 6 us Use key sequence value SHIFT 0 STORE 0 G...

Page 77: ...ting signal and enter the required special function number Enable special functions Refer to Subsection 3 4 8 for special function numbers and procedures 11 Select the HOLD modeQfor single shot measur...

Page 78: ...ue SHIFT i6f STORE jew GATE iso Programmed gate times are immediately enabled with the resolution set accordingly Skip step 7 if step 6 is being used to enter the gate time 7 Use the RESOLUTION f keys...

Page 79: ...he HOLD mode 7 for single shot measurements Press the RESET 7 while in Hold to trigger a new measurement 12 If external arming gating is in use trigger a measurement period 13 Ensure that the GATE LED...

Page 80: ...n 21 Select AUTO TRIG A B 0 or set the trigger levels A B manually using key sequence TRIG LEVEL 0 0 value TRIG LEVEL 0 Check that Inputs A and B TRIG LEDs 0 flash Use the RESOLUTION keys 0 when the d...

Page 81: ...umber Enable special functions Refer to Subsection 3 4 10 for special function numbers and procedures Select the HOLD mode T for single shot measurements Press the RESET j while in Hold to trigger a n...

Page 82: ...using Special Function 21 Select AUTO TRIG A B f 0P set the trigger levels A B manually using key sequence TRIG LEVEL S value TRIG LEVEL S Check that Inputs A and B TRIG LEDs ig flash If a frequency b...

Page 83: ...mode J for single shot measurements Press the RESET J while in Hold to trigger a new measurement 12 If external arming gating is in use trigger a new measurement cycle 13 Ensure that the GATE indicat...

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Page 85: ...ns using key sequence SHIFT isf SF Connect the measurement signal to INPUT A 0 Set the AUTO TRIG A u5a or select the trigger level A manually using key sequence TRIG LEVEL S value TRIG LEVEL Check tha...

Page 86: ...d gate time will be rounded to the nearest 25 6 jus Use key sequence value SHIFT 0 STORE 0 GATE S Programmed gate times are immediately enabled with the resolution set accordingly Skip step 7 if step...

Page 87: ...n number Enable special functions Refer to Subsection 3 4 8 for function numbers and procedures 11 Select the HOLD mode J for single shot measurements Press the RESET while in HOLD to trigger a new me...

Page 88: ...QK O Q m T f ct INPUT A t AUTO C3 I I irm e tp O X T gad iow CT 40 Ql rp ri r o r i h j ac ct q a to Sn 1 3 c co ar CJ CZj rum CT CM MAX A Racal Instruments i99 UNIVERSAL COUNTER S 3b 1 Turn power on...

Page 89: ...th with start positive and stop negative 50 trigger points 3 Use the slope key for Input A 0 to change to negative pulse width by toggling Input A slope to negative Negative pulse width has start nega...

Page 90: ...e 5 Connect the signals to be compared to INPUT A n and INPUT B 0 6 Select AUTO TRIG A and B 0 f or set the trigger levels A and B manually using key sequence TRIG LEVEL 0 0 value TRIG LEVEL 0 Check t...

Page 91: ...but truncated to just 3 digits when stored as a trigger level For example 4 6432V becomes 4 64V XI or 4 6V X10 Also the trigger level operates in 20 mV XI and 200 mV X10 steps with all entries being...

Page 92: ...G LEVEL key 0 to display the trigger level reenter 47 2V This new trigger level may be stored or changed NOTE INPUT A and B each have a single trigger level store Using the Auto Trigger mode overwrite...

Page 93: ...f 10 the most significant digit will overflow the display A 10 overrange of the counter s display occurs without a change of range 3 4 3 3 Results are rounded to meaningful values in all measurement f...

Page 94: ...fting of digits NOTE 2 Measurements of frequency period ratio and check are averaged when these gate times are set SRS Store Display Resolution Command 3 4 4 2 Gate Time Storage Recall 3 4 4 2 1 Use k...

Page 95: ...rcuit may be delayed or held off when either the TI A B or TOTAL A by B function is selected The programmable delay range is 200 jus to 800 ms with the display rounded to the nearest 25 6 jus In the h...

Page 96: ...set normalized or scaled before display using stored constants X Y and or Z respectively The display indicates R X Y Z after enabling the math function Home state values for X Y and Z are 0 1 and 1 re...

Page 97: ...994 except totalize Resolution is improved by one display digit one decade Any number exceeding the display range will produce an Er 02 error message 3 4 9 2 100 AVG Function Enabling Disabling 3 4 9...

Page 98: ...a number from its register another number from the same decade must be stored 3 4 10 3 4 Numbers stored in the special function register are retained when the counter is switched to Standby mode and...

Page 99: ...Table 3 13 Special Functions SFs...

Page 100: ...s specified to 10 ns only Totalize B by A operates for one complete cycle of Input A NOTE 2 Special Functions 40 42 43 and 44 are available only in local operation Special Function 41 is selected auto...

Page 101: ...low of internal counters Numerical entry error e g number out of range or attempt to store trigger level in an auto triggered channel Programming error Basic Check mode error Relay Check Failure NOTE...

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Page 103: ...outputs are made via a standard 24 pin connector see Figure 4 1 on the rear panel Pin location signal line identification and GPIB operation comply with IEEE STD 488 1978 The GPIB provides interface c...

Page 104: ...Data Accepted 5 EOI End or Identify 9 IFC Interface Clear 10 SRQ Service Request 11 ATN Attention 17 REN Remote Enable 12 SHIELD 18 GND 6 19 GND 7 20 GND 8 21 GND 9 22 GND 10 23 GND 11 24 GND 5 and 17...

Page 105: ...bus lines are either input or output lines having the following characteristics Logic Levels 1 Low 8V 0 High 2 0 V Input Loading Each input one TTL load Output The output is capable of driving 15 inte...

Page 106: ...ice Trigger CO Controller El Open Collector Bus Drivers Applicable Capability Complete Capability Complete Capability Complete Capability Basic Talker Serial Poll Talk Only Mode Unaddress if MLA None...

Page 107: ...ines b NRFD when low it signifies that the instrument is not ready to accept information c NDAC when low it signifies that information is not accepted by the acceptor bus device 4 2 3 Interface these...

Page 108: ...transferred from the source to the acceptor 4 2 3 2 Refer to Figure 4 3 It shows the sequential relationship between the DAV NRFD and NDAC lines used to transfer data bytes Figure 4 4 shows the hands...

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Page 110: ...us device without interfering with them NOTE Only a total of 15 devices including the 1994 can reside on any single 488 bus 4 3 2 The counter is equipped with a rear panel switch bank enabling the use...

Page 111: ...aa 04 1 1 B 0 0 i D 0 1 0 i 0 i DD 1 aaaaaa 05 HSmm 1 0 D 1 0 mm 0 n 0 faaaaaa 06 Hi 1 B 0 0 1 0 0 MM 0 1 i aaaaas 07 G HI 1 B 0 0 1 i Bjj 0 1 0 1 0 0 0 h faaaaaa 08 H 1 0 0 1 0 0 0 0 i 0 1 0 0 1 laaa...

Page 112: ...Coat d DATA LINES D5 d4 3 d 2 D 1 ADDRESS 16 8 D 2 1 DECIMAL ADDRESS HI 5393333 93339 sjiai ttJ v i 39393 5393939 9399 i393999 5399333 5399339 3 5399399 U 1399933 5399939 899993 The Talk Only switch i...

Page 113: ...nd D7 4 3 7 The counter s GPIB address can be displayed in decimal form using key sequence SHIFT RECALL ADDR If the 1994 s bus address is changed the previous key sequence must be repeated to display...

Page 114: ...the 1994 s listen address REMOTE 715 c Verify that the REM LED lights d Test as shown below Action HP 85 Code Your Controller Send the device dependent command CK OUTPUT 715 CKn e Verify that the ADD...

Page 115: ...lights Operate the LOCAL key on the front panel and check that the REM LED remains lit b Test as shown below Action HP 85 Code Your Controller Send the REN command false LOCAL 7 c Verify that the REM...

Page 116: ...command CK OUTPUT 715 CK Prepare a store to receive a 21 byte data string DIM Z3 21 Send the 1994 s talk address Store the 21 byte data string in the prepared store ENTER 715 Z3 Display the contents...

Page 117: ...ace of the controller in binary form as variable STATUS 7 2 T Display the status of the SRQ line DISP SRQ BIT T 5 a Verify that the HP 85 display reads SRQ 1 the SRQ status bit is at logic 1 Confirm t...

Page 118: ...dent command TA Send the DCL command true CLEAR 7 a Verify that the function indicated on the front panel changes to FREQ A b Test as shown below Action HP 85 Code Your Controller Reset the 1994 to th...

Page 119: ...rify that the ADDR LED is turned off 4 5 INTERFACE MESSAGE REPERTOIRE and RESPONSE 4 5 1 Introduction 4 5 1 1 The 1994 is equipped with a standard GPIB interface designed to meet IEEE STD 488 1978 spe...

Page 120: ...remain under local control 4 5 2 4 Talk Addresses Other Devices 4 5 2 4 1 If the counter was previously addressed to talk then receives the talk address of another bus device the 1994 ceases to be a...

Page 121: ...es to the local control state A GTL command returns the counter to local control The decimal and hex equivalents are 17 and 11 respectively 4 5 3 6 Device Clear DCD 4 5 3 6 1 Same as the SDC command e...

Page 122: ...4 6 2 Talk Only Mode 4 6 2 1 To set the counter in this mode place the Talk Only switch of the GPIB switch bank in its logic l position The GPIB interface is now in the Talk Only mode and the settings...

Page 123: ...ands see Subsection 4 10 These commands are sent over the GPIB after the counter has been addressed to listen Completed measurement readings and counter status information are then read back over the...

Page 124: ...asurement sign or 4 Most significant digit 0 to 9 Bytes 4 to 5 Digit 0 to 9 or 15 will always 6 include 11 digits 7 and decimal point 8 Zeros are added 9 when necessary in 10 the more 11 significant 1...

Page 125: ...Z Delay Time DT Special Function SF Master Software Issue MS GPIB Software Issue GS Gate Time GT Memory Non Vol M 4 7 2 High Speed Data Output Mode 4 7 2 1 The 1994 provides a High Speed Output mode w...

Page 126: ...nter 7 T23 T22 T21 T20 T19 T18 T17 T16 Next most significant byte of Time counter 8 TT7 TT6 TT5 TT4 TT3 TT2 TT1 TTO Least significant byte of Start TEC counter 9 TP9 TP8 TT11 TT10 TT9 TT8 Most signifi...

Page 127: ...O Least significant byte of delay calibration Stop TEC counter 4 7 2 3 The Event and Time counters are 24 bit binary numbers while each of the TEC counters are 12 bit binary numbers The following symb...

Page 128: ...i P 0 6 f i j r I 1 t o 1 9 7 i r d b i i n 3 ft l I 8 5 n e x t I 9 5 w r t 700 11 f d 10 5 ft 9 3 m o d 1 6 2 5 6 ft C83 4 T 1 1 ft 9 1 1 6 i vi o d 1 6 4256 ft 183 4 1 2 ft 1 23 m o d 1 6 2 5 6 ft...

Page 129: ...9 STATUS BYTE 4 9 1 To inform the controller of its status the counter assembles and transmits a status message referred to as a status byte The controller generates a serial poll enable cycle to dete...

Page 130: ...d as follows Error 1 correct the difference in input freauencies or change the measurement mode Error 2 complete an in ranere measurement Error 3 complete an in ranee measurement Error 4 complete a va...

Page 131: ...han one command is to be sent no delimiters are required If necessary commas spaces and semicolons may be included in the command strings for clarification without affecting counter operation 4 10 2 4...

Page 132: ...ytes 2 to 11 may have up to 9 digits and a decimal point The decimal point however is not essential After entry of 9 digits without a decimal point additional digits are ignored and a GPIB programming...

Page 133: ...ds for gate delay times 4 10 2 7 Table 4 11 presents the measurement function codes for the 1994 Table 4 11 Measurement Function Codes Function Code Frequency A FA Frequency B FB Frequency C FC Period...

Page 134: ...y SM RM 0 9 NOTE 1 Entered numbers will be rounded up before storage as follows a Trigger level XI to next multiple of 20 mV b Trigger level X10 to next multiple of 200 mV c Delay gate time to next mu...

Page 135: ...nship of gate time and display resolution in the 1994 4 10 2 10 The following tables complete the necessary GPIB commands for the 1994 Table 4 14 Input Control Codes Function Code FILTER Disable Enabl...

Page 136: ...ffer is updated at the end of each gate period If the buffer is being read out via the bus when the gate period ends updating is delayed until reading is complete NOTE 2 In single measurement mode the...

Page 137: ...call GPIB software issue Code RUT SRS RRS SLA RLA See NOTE 1 SLB RLB See NOTE 1 SMX RMX SMY RMY SMZ RMZ SDT RDT SGT RGT SM RM See NOTE 2 RSF RMS RGB NOTE 1 The manual trigger level is automatically sc...

Page 138: ...d from stores Table 419 Alphabetic List of Command Codes Code Command _ Code Command AAC A Channel AC coupling A Channel X10 attenuator NA 100 Average disabled AAD NW Negative pulse width A disabled P...

Page 139: ...ay time BNS B Channel ve slope SFD Special function disabled BPS B Channel ve slope SFE Special function enabled CK Check SGT Store gate time DD Delay disabled SLA Store trigger level A DE Delay enabl...

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Page 141: ...h them e g ICla Finally when it is necessary to identify a specific pin in an IC the reference designator with a suffix letter if necessary is followed by a hyphen and then the required pin number e g...

Page 142: ...and IRQ block handles instructions to switch to standby These instructions are received from the keyboard block and interrupt requests made by other systems RELAY CONTROL Figure 5 1 Simplified Overall...

Page 143: ...amplifiers in parallel can be selected 5 3 1 1 3 The channel amplifiers feature separate high frequency and low frequency paths The crossover frequency is nominally 5 kHz Signal filtering can be intro...

Page 144: ...to the output of the low frequency buffer and as a high pass filter to the output of the high frequency buffer The crossover frequency is 5 kHz 5 3 1 2 7 The signal at Q21 emitter is fed to the Schmi...

Page 145: ...utput is below the threshold the latch is set and the channel output is inhibited by the signal gate When the detector output goes above the threshold the low signal latch is armed and opens the signa...

Page 146: ...de too low for accurate counting 5 3 2 2 6 The logic level at the comparator output is inverted in ICl A and is fed via SK7 pin 14 to the D input pin 10 of the low signal latch IC41b shown on page 7 1...

Page 147: ...counting the clock pulses which occur while the gate is open This leads to timing errors at both ends of the gate time as shown The TEC circuit enhances the measurement accuracy by compensating for t...

Page 148: ...andard in use is made available at a socket on the rear paneL 5 3 3 2 Circuit Description 5 3 3 2 1 Refer the the schematic shown on page 7 11 5 3 3 2 2 Measured Signal Input 5 3 3 2 2 1 For all measu...

Page 149: ...at pin 6 and after inversion in IC29e to IC18 24 5 3 3 2 4 Microprocessor Clock and Timer 5 3 3 2 4 1 A 5 MHz clock signal for the microprocessor and the GPIB microprocessor if fitted is taken from I...

Page 150: ...l Description 5 3 4 1 1 A simplified diagram of the display block is given in Figure 5 6 The GPIB LEDs GATE LED Channels A and B TRIGGER LEDs and the STANDBY LED are held on or off by control signals...

Page 151: ...DI6 are controlled by the display driver IC3 Numeric indicators Dll to DI4 are controlled by IC4 5 3 4 2 2 Display data is stored in memory within IC3 and IC4 To change the data the microprocessor put...

Page 152: ...coding is complete Data transfer is initiated by the KEYBOARD ENABLE signal from the microprocessor 5 3 5 1 2 The 32 keys are divided into two 16 key matrices When a key is pressed its position is enc...

Page 153: ...EXTEND line indicates which matrix contains the key that is pressed The inputs to IC2 are normally held at logic 1 so that SK2 pin 9 is at logic 1 If a key in the extended matrix column lines connecte...

Page 154: ...holds them on an 8 bit address bus to free the multiplexed bus for data 5 3 6 1 2 Two latches fed from port B of the microprocessor are used to maintain voltage levels on the instrument control lines...

Page 155: ...lines AO to A7 Lines BO to B7 are now free for use as a data bus 5 3 6 2 4 Address Decoding 5 3 6 2 4 1 The levels on address lines A6 to A12 are decoded in IC21 to provide the following outputs a MCC...

Page 156: ...by signal from the keyboard block sets the standby IRQ latch The latch outputs provide the standby IRQ and a standby flag for the microprocessor The standby IRQ output also clocks the standby ON OFF l...

Page 157: ...to provide the GPIB reset 5 3 7 2 2 2 If there is a reduction in the 5V STANDBY supply due to the instrument being switched off or to power failure the potential across R217 falls The potential at Q2...

Page 158: ...C121 IC32b and D28 disables the microprocessor interrupt input and holds the GPIB microprocessor reset line low via Q29c while the 5V power supply to R220 is switched off On return from standby Cl 21...

Page 159: ...tors IC3 and IC4 The common terminals of these regulators are held at approximately 0 7V and 0 7V by diodes D13 and D14 5 3 5 2 4 Regulated supplies at 5V are provided by two discrete component regula...

Page 160: ...Figure 5 11 Figure 5 11 Internal Frequency Standard Block Diagram 5 3 9 1 2 The 10 MHz signal is passed to the measurement block via a buffer IC2 on the motherboard 5 3 9 1 3 Signals from an external...

Page 161: ...39 3 5 3 10 GPIB Interface 5 3 10 1 Introduction 5 3 10 1 1 The GPIB interface is a self contained microprocessor controlled system It handles the transfer of data between its internal memory and the...

Page 162: ...rupt request to the microprocessor 5 3 10 4 2 IC17B is in the reset state giving a logic 1 at IC18 12 Since IC12 27 is at logic 1 when the GPIA is addressed to talk IC18 13 is also at logic 1 The resu...

Page 163: ...0 of the data bus is transferred to IC16B 5 and forms the ready for data RFD signal to the instrument s microprocessor 5 3 10 6 4 The instrument s microprocessor enables and addresses IC3 to give an...

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Page 165: ...red test equipment is provided in Table 6 1 on the next page Equipment needed for specific procedures is indicated at the beginning of each set of instructions 3 Particular models of specific equipmen...

Page 166: ...el of 20 mV to 6V Racal 5001 4 Signal Generator 10 kHz to 1 3 GHz Racal 9087 5 Audio Generator Frequency range of 10 Hz to 5 kHz output level of 30 mV into 50 ohms Racal 9083 6 Pulse Generator Single...

Page 167: ...ch towards the rear panel and lift off The bottom cover slides off in the same manner 6 To replace the covers reverse the above procedure Ensure that the tongues of the covers fit under the edges of t...

Page 168: ...osed by removing the rear corner feet 4 Ease the rear panel away from the counter disconnecting the BNC mounting board assembly from the motherboard at PL19 and PL2Q 5 Remove the nut and crinkle washe...

Page 169: ...e 6 2 are those special function numbers for use during maintenance and calibration Check mode must be selected TABLE 6 2 Diagnostic Special Functions Function Number Function 70 Basic 10 MHZ check de...

Page 170: ...tput pins on the rear panel 21 Special Function 77 Special function 77 continuously tests the relays associated with Channel A input X1 X10 attenuators 50fl lMf2 input impedance DC AC coupling FILTER...

Page 171: ...FLOWCHARTS Introduction 24 Refer to Fig 6 1 A F and 6 2 for main counter and GPIB troubleshooting flowcharts They are designed to facilitate the user in tracing specific 1994 faults and failures to th...

Page 172: ...6 8 Figure 6 1 Fault Finding Flowchart Part 1...

Page 173: ...FROM PREVIOUS PAGE Figure 6 1 Fault Finding Flowchart Part 1 Cont d...

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Page 175: ...FROMPREVtOUSPAGE T GO TO NEXT PAGE Figure 6 1 Fault Finding Flowchart Part 3...

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Page 177: ...E SPECIAL FUNCTION 78 WAIT 10 SECONDS REPLACE FILTER RELAY CHECK OPERATION OF CHANNEL A X1 X10 RELAY SELECT FREQ A FUNCTION NNECT 10 MHz STD OUTPUT SOCKET TO CHANNEL A INPUT SOCKET SELECT RESOLUTION O...

Page 178: ...FROM PREVIOUS PAGE GO TO NEXT PAGE 6 14 Figure 6 1 Fault Finding Flowchart Part 5...

Page 179: ...FROM PREVIOUS PAGE Figure 6 1 Fault Finding Flowchart Part 5 Cont d 6 15...

Page 180: ...TO IS CONNECT GRIB CONTROLLER CONNECT BUS ANALYZER SET TO SINGLE STEP CONNECT INT STO OUT TO INPUT A ENTER AND RUN 10 OIM AS 301 20 ENTER 715 AS 30 OISP AS 40 ENO TRACE SIGNAL FROM IC9 9 TO INOICATOR...

Page 181: ...HECK THAT AODR INDICATOR LIGHTS AND OSCILLOSCOPE DISPLAYS WAVEFORM SHOWN RELEASE BUS ANALYZER FROM SINGLE STEP ALLOW CONTROLLER TO RUN PROGRAM CHECK THAT CONTROLLER DISPLAYS FA 00 1 0 OOOOOOO 06 INSTR...

Page 182: ...LINES BETWEEN SK3 AND IC12 REFER TO READING FROM THE BUS IN SECTION 5 ENTER AND RUN 10 ABORTIO 7 20 GOTO 10 MONITOR IC12 21 USING THE OSCILLOSCOPE CHECK THAT OSCILLOSCOPE SHOWS CORRECT WAVEFORM GO TO...

Page 183: ...9 ADDR INDICATOR OUT UNIT NOT RESPONDING TO IFC CHANGE IC1 2 ENTER ANO RUN 10 CONTROL 7 16 129 20 SEND 7 MTA DATA FA EOS LISTEN 15 30 GOTO 20 MONITOR IC12 21 USING THE OSCILLOSCOPE CHECK THAT OSCILLO...

Page 184: ...NTER TO BE OPERATED WITH COVERS REMOVED DANGEROUS AC VOLTAGES ARE EXPOSED UNDER THESE CONDITIONS Input A System 27 Required test equipment includes a signal generator see Table 6 1 Item 4 28 First set...

Page 185: ...key five times until 00000000 is displayed NOTE Disregard any noisy readings that may be experienced 3 Turn on the RF output of the signal generator 4 Increase the generator s output to 13 mV r m s 5...

Page 186: ...ive times until 000 is displayed 4 Connect the test equipment as shown in Fig 6 6 SIGNAL GENERATOR 10 MHz STD OUT EXT STD INPUT COUNTER RF ABC O O 0 Fig 6 6 Connections for Input B System Adjustment 5...

Page 187: ...display is just stable showing 100 000000 E 6 0 000001 E 6 6 Reduce the generator s output to 7 mV r m s Verify that the GATE LED stops flashing If flashing continues repeat steps 4 through 6 7 Turn o...

Page 188: ...the test equipment Internal Frequency Standard Routine Calibration 38 Required test equipment includes a frequency standard see Table 6 1 Item 1 NOTE If either Option 04 A or 04E ovenized frequency st...

Page 189: ...on 04E 10 3 7 Turn off the counter and disconnect the test equipment OVERALL SPECIFICATION CHECK Introduction 40 Satisfactory completion of the following performance verification procedures PVPs will...

Page 190: ...equipment as shown Fig 6 9 A Verify that the EXT STD LED lights SIGNAL GENERATOR 10 MHz STD OUT EXT STD INPUT COUNTER RF J ABC O 0 o Fig 6 9A Connections for Input A Sensitivity PVP D 3 Set in turn t...

Page 191: ...its 20 mV 10 Hz 3 Digits 20 mV 3 For each selected frequency determine the minimum input level to the counter that provides stable counting Verify that these minimum levels do not exceed those shown i...

Page 192: ...E 6 6 A Input B Sensitivity D Counter Resolution Signal Level 100 MHz 8 digits 10 MHz 7 digits 100 kHz 5 digits 5 For each selected frequency determine the minimum input level to the counter that prov...

Page 193: ...e table 4 Press the key sequence 2 0_ SHIFT STORE SF shift SF 5 Turn off and disconnect the test equipment Input C Sensitivity PVP Option 41 only 49 Required equipment includes a signal generator and...

Page 194: ...ncludes a signal generator see Table 6 1 Item 4 52 Complete the following procedure 1 Connect the signal generator output to the EXT STD INPUT socket on the rear panel of the counter 2 Set the signal...

Page 195: ...ee Table 6 1 Item 4 56 Complete the following procedure 1 Connect the signal generator as shown in Fig 6 13 Fig 6 13 Connections for Minimum Time Interval PVP 2 Select 50 ohms on Input A function TI A...

Page 196: ...ator to provide a single 300 jus positive going pulse with a low level of G 8V and a high level of 2 8V TTL limit levels 5 Press the key sequence a 6 SHIFT STORE SF SHIFT SF 6 Verify that the instrume...

Page 197: ...veform of approximately 12V peak to peak with a frequency of 2 Hz 4 Select the CHECK function 5 Press the key sequence 0 6 SHIFT STORE SF SHIFT SF 6 Verify that Input A and B TRIG LEDs are flashing an...

Page 198: ...cope probe to the TRIGGER LEVEL B OUTPUT pin and verify that the multimeter indicates 5V 60 mV For Inputs A and B press the key sequence TRIG LEVEL 1 TRIG LEVEL Verify that the multimeter indicates 0V...

Page 199: ...elect function FREQ A Verify that 00000000 is displayed If Option 04E is installed press the RESOLUTION kev until 000000000 is displayed y 2 Connect the test equipment as shown in Fig 6 18 Fig 6 18 Co...

Page 200: ......

Page 201: ...Schematic GPIB 7_ 18 401762 PCB Assy BNC WWW 7 22 431762 Schematic BNC Option 404395 Option 01 Rear Input Assembly 7 24 404392 Option 04A Oscillator Assembly 7 25 404397 Oven Oscillator 7 26 404384 O...

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Page 206: ...PLCS 7 6...

Page 207: ...21793 431730...

Page 208: ...CIRCUIT SI OE 7 8...

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Page 211: ...32i59...

Page 212: ...4 32t5 9...

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Page 214: ...PC8 ASSY DISPLAY...

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Page 219: ...74LSSS7 21793 431760...

Page 220: ...21793 M3J760...

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Page 222: ...PCB ASSY BNC...

Page 223: ...NSTALLED _ 2 c Q i 1 tM O O z O N i 1 O in tp ji c t 1 W o 7 23...

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Page 225: ...OSC ASSY OPTION 04...

Page 226: ......

Page 227: ......

Page 228: ...OSCILLATCP A...

Page 229: ...24 REF 7 29...

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Page 233: ...7 33...

Page 234: ...21793 404389...

Page 235: ...OE...

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Page 237: ...8 19 404392 Option 04A Oscillator 8 19 404397 Oscillator Assy 8 20 404384 Option 04 E Oscillator 8 20 404386 Oscillator Assy 8 21 404691 Cable Assy Oscillator 8 21 404399 Option 10 Reference Frequency...

Page 238: ......

Page 239: ...VO UJ 4 00 0 UJ CM ro X CM ro 1 to VO VO C vo X UJ vo X Q_ Q 0 3 UJ CX QC OVO to w Q C7 UJ ce ro O CM CM O H ce UJ G 4 X 0 40 QC UJ X 1 QC H VO z z N f 0 s 5 g O o 00 QC tO O tr 3 0 cr CM r n O V to...

Page 240: ...04391 CHASSIS ASSEMBLY CONT O...

Page 241: ...404426 MQTHt BBOARD PCB ASSY 4 404426 WTMERBGARD PCS ASSY CONT 0...

Page 242: ...hanged 5 93 8 6...

Page 243: ...CO CO o re O NT s s CO a o CO 3 id co u u u X CO X X V CL z 2 St co o o Cd O O CO ON r NT o Ui OS 3 X id U id 5 co co QQ d X Ui as 3 X Ui it o CO o CO k CO o p 3 ifc o o CO 2p o CO o it O d o CO VJ12...

Page 244: ...eg eg ro eg eg VO X rs s P s ro i r z VO UJ ro PSw ro wo J rs Z ro P s ro vO r rs z VO DM74LS74N SN74LS10N z 3 VO mJ r fs vO z UJ CO X o 7 o o ro O o 2 8 O T u VO u ro f s S ro rg y O ro f S ro r o ro...

Page 245: ...404426 MOTHERBOARD PC8 ASSY CONT D 404426 MOTHERBOARD PCB ASSY COKT D...

Page 246: ...S rr 5 in M X v 25 v in 25 i 2S S Si 5 V 2 a i 4 s X 5 X g 28 X 5 VO af 3 X s 3 X CO X 5 28 SO X 1 i S o i r 8 4 o CM i 4 8 5 8 5 s X O 1C o p _7 X a n s o o 04 s 8 U1 s s S 8 8 X o a 2 Q a Q 2 3 a a...

Page 247: ...404426 MOTHERBOARD PCB ASSY COKT D 4 404426 MOTHERBOARD PCB ASSY CGHT O...

Page 248: ......

Page 249: ...o o QC 4 1 v ro no ro ro ro ro ro ro i o 04 O 8 O O 8 rO 8 4 o o ro 8 ro i 8 o ao 8 8 ro 8 8 O o 8 4 u 04 04 04 OJ si 04 04 Un w X 40 8 S3 04 ro UJ s i UJ s fN u s cr UJ o w S a 04 J g 3 Lrt a X i 7 0...

Page 250: ......

Page 251: ...a s m rn O c n r i I m sO o r m 1 r CO o M r 3 8 CM m 8 M cn 03 o CM rn 00 o XJ lO o 3 CM 03 O o CM U o o CM u O 3 3 U3 O o CM Lrt O 3 CM un O 3 CM l 1 o 3 CM lT o o CM JJ o 3 CM CO d o CM o S CM o U...

Page 252: ...eg CM C 4 r J oa Nj C J Cvjjcg 04 04 C J i C Ni 04 N N N N N N fti N i i N l 2 2i5iSSi22fl 3 53S3S3SS 5sj553aa5SS531553533g55 333313 s S2 5 M5 o is is is is is is is is is ia o is is o is 333 3333333...

Page 253: ...08005a RES NETWORK CERMET 15K 10R9R 11 236 750 101 R15K...

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Page 256: ...404384 OPT 04E OSCltUlOR 8 20...

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Page 259: ...19 1164 REFERENCE FREQUENCY MULTIPLIER ASSY CONT 0 2 404S98 OPTION 41 CHANNEL...

Page 260: ...8 24 8 o 8 8 8 3 N SJNN M V4 5 5 5 8 8 8 8 i N M N N f 3 8 8 8888888 0 v g g g N N w M 2 S s 21 1801 CAP CHIP 10 NF 50V 20 95275 VJ1206V103HXA...

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Page 263: ...Number 1 Describe in detail the problem and symptoms you are having Please include all set up details such as input output levels frequencies waveform details etc 2 If problem is occurring when unit...

Page 264: ......

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Racal Instruments 1994, Service Manual

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