HP (Hewlett-Packard) 5345A, 5345AOPT12, E28 User Manual

*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

You can help improve this publication. If you find any mistakes or if you know of a
way to improve the procedure, please let us know. Mail your letter or DA Form 2028
to: Commander, U. S. Army Aviation and Missile Command, ATTN: AMSAM-MMC­MA-NP, Redstone Arsenal, AL 35898-5230. A reply will be furnished to you. You may
also send in your comments electronically to our e-mail address:

[e-mail] or FAX [phone]/DSN 788-6546.

SECTION I. IDENTIFICATION AND DESCRIPTION Paragraph Page

Test instrument identification ............................ 1 2

Forms, records, and reports............................... 2 2

Calibration description....................................... 3 2

II. EQUIPMENT IDENTIFICATION

Equipment required ........................................... 4 3

Accessories required.......................................... 5 3

III. CALIBRATION PROCESS

Preliminary instructions.................................... 6 4

Equipment setup................................................ 7 4

Time base stability ............................................. 8 5

Sensitivity.......................................................... 9 6

A12 Interface I/O................................................ 10 8

Power supply ..................................................... 11 9

Final procedure.................................................. 12 12

__________
This bulletin supersedes TB 9-6625-1996-35, dated 13 November 1985.

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 within the text.

b. Time and Technique. The time required for this calibration is approximately 2

hours, using the dc and low frequency technique.

2. Forms, Records, and Reports.

a. Forms, records and reports required for calibration personnel at all levels are
prescribed by TB 750-25.

b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables, the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).

3. Calibration Description. TI parameters and performance applications which
pertain to this calibration are in table 1.

Table 1. Calibration Description

Test instrument parameters Performance specifications

Time base:

Channel A and B sensitivity: Separate inputs:

A12 interface I/O Range: -2 to +2 V dc

Frequency: 10 MHz
Aging rate (after 24 hour warmup): < 5 x 10
Line voltage variation
(for 10% variation): <1 x 10

25 mV rms: dc to 500 MHz (dc coupled)

Common inputs:
50 mV rms: dc to 400 MHz (dc coupled)

Accuracy: ±0.0005 V dc

-10

15 minutes after change

-10

per day

2

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 use specifications listed in table 2. The accuracies listed in table 2
provide a four-to-one ratio between the standard and TI.

5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure. The following peculiar accessories are also required for this
calibration: Adapter, SMC jack to BNC plug, Hewlett-Packard Model 1250-0831;
Extender Boards, 10-terminal circuit board extenders (05345-60201 and 05345-60202);
and Extender Cable, Hewlett-Packard Model 05345-60205.

Table 2. Minimum Specifications of Equipment Required

Common name

AUTOTRANSFORMER Range: 105 to 125 V ac

FUNCTION GENERATOR Range: 10 Hz to 30 MHz

FREQUENCY DIFFERENCE
METER

MULTIMETER Range: -2 to +2 Vdc

OSCILLOSCOPE Bandwidth: 100 MHz

SIGNAL GENERATOR Range: 30 to 500 MHz

TIME/FREQUENCY
WORKSTATION

Minimum use specifications

Accuracy: ±1%

Amplitude: 0 to 40 mV rms
Accuracy: ±3% (±1.5 dB)
Range: 10 MHz
Resolution: 1 part in 10

Accuracy: ±0.000125%
Range: 0 to ± 15 V dc
Accuracy: ±0.03%

Sensitivity: 50 mV/div
Sweep rate: 10 ns/div
Accuracy: ±3%

Amplitude: 0 to 40 mV rms
Accuracy: ±3% (±1.5 dB)
Frequency: 10 MHz
Accuracy: 1.25 parts in 10

-10

per day

-10

per day

Manufacturer and model

(part number)
General Radio, Type
W10MT3AS3 (7910809) or
Ridge, Model 9020A (9020A)
or Ridge, Model 9020F (9020F)
(SG-1288/G)

3.7 to 12.4 GHz, Hewlett­Packard, Model 537A
(7910718-2)
Hewlett-Packard, Model
3458A (3458A)

Tektronix, Type 2465BOPT46
(2465BOPT46)

(SG-1207/U)

Autek Systems Corp. Model
620 (MIS-38946)

3

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, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manual for this TI.

d. Unless otherwise specified, all controls and control settings refer to the TI.

7. Equipment Setup
WARNING

HIGH VOLTAGE is used or exposed during the performance
of this calibration. DEATH ON CONTACT may result if
personnel fail to observe safety precautions. REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.

a. Remove protective cover from TI only when necessary to make adjustments.
Replace cover after completing the adjustments.

b. Connect TI rear panel DIGITAL BUS 1.0 LOAD to controller GPIB0 (opt 12
only).

c. Connect TI to autotransformer, connect autotransformer to a 115 V ac source and
adjust for 115 V ac output.

d. Set POWER switch to ON and allow at least 1 hour for stabilization. If TI has
been disconnected from line power for more than 24 hours, allow at least 24 hours for
warmup before beginning calibration.

e. Set TI rear panel INT STD/EXT STD switch to INT STD and INTERNAL/EXT
ARM/EXT GATE switch to INTERNAL (OPT 12 only).

f. Position controls as listed in (1) through (10) below:
(1) FUNCTION switch to FREQ A.

(2) GATE TIME switch to 100 ms.
(3) DISPLAY POSITION switch to AUTO.

4

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 Ω .
(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 FREQ STD OUTPUT 10 MHz (rear panel) to frequency

difference meter SIG INPUT.
(3) Adjust A18 FREQ ADJ (fig. 1) for minimum difference indication on frequency

difference meter.

Figure 1. Test instrument - top view.

(4) Allow at least 24 hours for stabilization. Frequency difference meter
indication will remain within 5 parts in 10

-10

.

(5) Adjust autotransformer output to 105 V and allow 15 minutes for
stabilization. Verify that TI oscillator drift is less than 1 part in 10

-10

.

(6) Adjust autotransformer output to 125 V and allow 15 minutes for
stabilization. Verify that TI oscillator drift is less than 1 part in 10

-10 .

(7) Adjust autotransformer output to 115 V.

b. Adjustments. No further adjustments can be made.

5