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*TB 9-6625-1996-35
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
FREQUENCY COUNTER
HEWLETT-PACKARD
MODELS 5345A, 5345A/E28 AND 5345AOPT12
Headquarters, Department of the Army, Washington, DC
25 June 2001
Approved for public release; distribution is unlimited
REPORTING OF ERRORS AND RECOMMENDED IMPROVEMENTS
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TB 9-6625-1996-35 SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Frequency Counter, Hewlett-Packard, Models 5345A, 5345A/E28 and 5345AOPT12. The manufacturer's manuals were used as the prime data sources in compiling these instructions. The equipment being calibrated will be referred to as the TI (test instrument) throughout this bulletin. a. Model Variations. Differences among models are listed
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TB 9-6625-1996-35 SECTION II EQUIPMENT REQUIREMENTS 4. Equipment Required. Table 2 identifies the specific equipment to be used in this calibration procedure. This equipment is issued with Secondary Transfer Calibration Standards Set AN/GSM-287 or AN/GSM-705. Alternate items may be used by the calibrating activity. The items selected must be verified to perform satisfactorily prior to use and must bear evidence of current calibration. The equipment must meet or exceed the minimum us
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TB 9-6625-1996-35 SECTION III CALIBRATION PROCESS 6. Preliminary Instructions a. The instruction outlined in paragraphs 6 and 7 are preparatory to the calibration process. Personnel should become familiar with the entire bulletin before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name as listed in table 2. c. Unless otherwise specified, verify the result of each test and, whenever the test requirement is not met,
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TB 9-6625-1996-35 (4) SAMPLE RATE control fully ccw. (5) CHANNEL A and B LEVEL controls to PRESET. (6) CHANNEL A and B SLOPE switches to + (positive). (7) CHANNEL A and B input impedance switches to 50 W. (8) CHANNEL A and B ATTEN switches to X1. (9) CHANNEL A and B AC-DC switches to DC. (10) CHECK-COM A-SEP switch to SEP. 8. Time Base Stability a. Performance Check (1) Connect time/frequency workstation OUTPUT 1 MHz to frequency difference meter REF INPUT. (2) Connect TI
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TB 9-6625-1996-35 9. Sensitivity a. Performance Check (1) Set function generator as listed in (a) through (c) below: (a) Output Type to UnBalanced 600 (b) Function to Sine Wave. (b) Frequency to 10 Hz. (c) Amplitude to 1 mV. (2) Position TI controls as listed in (a) through (f) below: (a) CHANNEL A LEVEL control to PRESET. (b) CHANNEL A SLOPE switch to +. (c) CHANNEL A 50W/1MW switch to 50W. (d) CHANNEL A ATTEN X1/X10 switch to X1. (e) CHANNEL A AC/DC switch to DC. (f)
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TB 9-6625-1996-35 b. Adjustments (1) Substitute signal generator for function generator. (2) Connect signal generator RF OUTPUT connector to TI CHANNEL A input. (3) Connect signal generator EXT REF INPUT connector (rear panel) to TI FREQ STD OUTPUT 10 MHz connector (rear panel). (4) Extend front panel display assembly using extender cable 05345-60205. Disconnect CHAN A P1 caple from A9 J1 CHA (CHAN B P2 cable to A9 J2 CH B for CHANNEL B) and connect A9 J1 CH A (A9 J2 CH B for CHAN
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TB 9-6625-1996-35 (10) Repeat (8) and (9) above as required to compensate for interaction. (11) Disconnect oscilloscope and signal generator from TI, reinstall TI from panel, and reconnect CHAN A P1 cable to A9 J1 CH A and CHAN B P2 cable to A9 J2 CH B. (12) Replace TI covers. 10. A12 Interface I/O a. Performance Check NOTE This option can only be calibrated in an automated mode. The TI must be connected to a controller with a properly configured GPIB IEEE interface card. NOTE I
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TB 9-6625-1996-35 A:00I1 CHAN A TRIG LEVEL 1.9995 2.0005 b2 B000I1 CHAN B TRIG LEVEL -2.0005 -1.9995 b3 B:00I1 CHAN B TRIG LEVEL 1.9995 2.0005 b4 b. Adjustments NOTE Remove top cover to make adjustments, then replace top cover before repeating (a) above. (1) Adjust A12 pot A (R69) (fig. 3) for a –2.0000 ± 0.0005 V dc multimeter indication (R). (2) Adjust A12 pot B (R74) (fig. 3) for a 2.0000 ± 0.0005 V dc multimeter indication (R). (3) Adjust A12 pot D (R86) (fig. 3) for a –2.0
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TB 9-6625-1996-35 a. Performance Check (1) Mount circuit board A6 (fig. 1) on extender boards. (2) Connect multimeter between A6TP6 and + 5 V RET (fig. 4). If multimeter does not indicate between 4.98 and 5.02 V dc, perform b(1) below. (3) Connect multimeter between A6TP3 and - 5.2 V RET (fig. 4). If multimeter does not indicate between -5.18 and -5.22 V, perform b(2) below. (4) Replace circuit board A6 in TI and mount circuit board A7 (fig. 1) on extender boards. (5) Connect mu
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TB 9-6625-1996-35 R18 R24 +15V RET TP7 TP2 A7 CIRCUIT BOARD S/N 1428A -15V RET TP3 R19 R29 +5V RET TP6 -5.2 V RET A6 CIRCUIT BOARD R16 R17 TP3 TP1 -15V RET +15V RET A7 CIRCUIT BOARD S/N 1808 Figure 4. Power supply circuit boards. 11
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TB 9-6625-1996-35 12. Final Procedure a. Deenergize and disconnect all equipment. b. Annotate and affix DA label/form in accordance with TB 750-25. 12
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TB 9-6625-1996-35 By Order of the Secretary of the Army: 011 6212 Distribution: To be distributed in accordance with IDN 342172, requirements for calibration procedure TB 9-6625-1996-35. PIN: 046669-000
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