HP 745a schematic
*TB 9-4931-700-50
CHANGE 6
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
AC VOLTAGE STANDARD,
HEWLETT-PACKARD MODEL 745A
AND HIGH VOLTAGE AMPLIFIER,
HEWLETT-PACKARD MODEL 746A
INCLUDING OPTIONS C90, C91, AND C93
Headquarters, Department of the Army, Washington, DC
11 September 2001
Approved for public release; distribution is unlimited.
TB 9-4931-700-50, 9 December 1977, is changed as follows:
1. Remove old pages and insert new pages as indicated below. New or changed
material is indicated by a vertical bar in the margin of the page.
Remove pages Insert pages
1 and 2 1 and 2
13 and 14 13 and 14
2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:
0121914
Distribution:
To be distributed in accordance with Std IDS No. RLC-1500, 11 May 1992, requirements
for calibration procedure TB 9-4931-700-50.
PIN NO: 009082-006
*TB 9-4931-700-50
Change 5
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
AC VOLTAGE STANDARD,
HEWLETT-PACKARD MODEL 745A
AND HIGH VOLTAGE AMPLIFIER,
HEWLETT-PACKARD MODEL 746A
INCLUDING OPTIONS C90, C91, AND C93
Headquarters, Department of the Army, Washington, DC
15 May 1989
TB 9-4931-700-50, 9 December 1977, is changed as follows:
1. Remove old pages and insert new pages as indicated below. New or changed
material is indicated by a vertical bar in the margin of the page.
Remove pages Insert pages
3 through 6 3 through 6
2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:
CARL E. VUONO
General, United States Army
Chief of Staff
Official:
WILLIAM J. MEEHAN ii
Brigadier General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with Std IDS No. RLC-1500, 25 January 1989.
PIN NO: 009082-005
*TB 9-4931-700-50
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
AC VOLTAGE STANDARD,
HEWLETT-PACKARD MODEL 745A
AND HIGH VOLTAGE AMPLIFIER,
HEWLETT-PACKARD MODEL 746A
INCLUDING OPTIONS C90, C91, AND C93
Headquarters, Department of the Army, Washington, DC
19 December 1988
TB 9-4931-700-50, 9 December 1977, is changed as follows:
Change 4
1. Remove old pages and insert new pages as indicated below. New or changed
material is indicated by a vertical bar in the margin of the page.
Remove pages Insert pages
4 and 5 4 and 5
2. File this change sheet in front of the publication for reference purposes.
By Order of the Secretary of the Army:
CARL E. VUONO
General, United States Army
Chief of Staff
Official:
WILLIAM J. MEEHAN ii
Major General, United States Army
The Adjutant General
Distributed:
To be distributed in accordance with STD IDS No. RLC-1500, 18 November 1987.
PIN NO: 009082-004
This is a REPRINT, including changes 1 through 3.
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*TB 9-4931-700-50
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
CALIBRATION PROCEDURE FOR
AC VOLTAGE STANDARD,
HEWLETT-PACKARD MODEL 745A
AND HIGH VOLTAGE AMPLIFIER,
HEWLETT-PACKARD MODEL 746A
INCLUDING OPTIONS C90, C91, AND C93
Headquarters, Department of the Army, Washington, DC
9 December 1977
REPORTING OF ERRORS
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: ls-
lp@redstone.army.mil or FAX 256-842-6546/DSN 788-6546.
Paragraph Page
SECTION I. IDENTIFICATION AND DESCRIPTION
Test instrument identification
Calibration data card, DA Form 2416
Calibration description................................
II. EQUIPMENT REQUIREMENTS
Equipment required ................................
Accessories required................................
III. PRELIMINARY OPERATIONS
Preliminary instructions................................
Equipment Setup................................
IV. CALIBRATION PROCESS
Frequency accuracy ................................
Error measurement................................
Voltage accuracy, regulation, and frequency
response (Model 745A) ................................
__________
*This bulletin supersedes TB 9-4931-700-60, 6 October 1976. CHANGE 6
1 2
2 2
3 2
4 3
5 3
6 6
7 7
8 7
9 12
10 14
TB 9-4931-700-50
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Paragraph Page
Voltage accuracy, regulation, and frequency
response (Model 746A) ................................
Distortion ................................
Power supply (Model 745A)
Power supply (Model 746A)
Final procedure................................
11 20
12 26
13 28
14 30
15 31
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Ac Voltage Standard, Hewlett-Packard Model 745A and High Voltage
Amplifier, Hewlett-Packard Model 746A including Options C90, C91, and C93. The
manufacturer's instruction manuals were used as the prime data source in compiling
these instructions. The equipment being calibrated will be referred to as the TI (test
instrument) throughout this bulletin.
a. Model Variations. There are no variations among models which affect the
calibration of the TI. The C90 option adds slides to the instrument. The C91 option
adds a blower to the instrument. The C93 option adds slides and a blower to the
instrument.
b. Time and Technique . The time required for this calibration is approximately 8
hours, using the dc (direct current) and low frequency technique.
2. Calibration Data Card, DA Form 2416
a. Forms, records, and reports required for calibration personnel at all levels arc
prescribed by TM 38-750. DA Form 2416 must be annotated in accordance with TM 38750 for ea ch calibration performed.
b. Adjustments to be reported on DA Form 2416 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 specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters Performance specifications
Output frequency range Continuously adjustable from 10 Hz to 110 kHz in 4
decade ranges with 10% overlap
Frequency accuracy ±2% of setting
Error measurement range ±0.3% and ±0.3% with zero center dial
Error measurement accuracy ±0.51% of FS
Distortion and noise (0.05% of setting + 10 µ V)
See footnote at end of table.
CHANGE 6 2
TB 9-4931-700-50
Table 1. Calibration Description - Continued.
Test Instrument Parameters Performance Specifications
Line regulation ±0.001% of setting change in output voltage for a 10%
change in line voltage (included in accuracy
specifications)
Voltage stability 1 mV to 100 V: short term; ±0.002% of setting for 24
hrs. 1000 V: short term; ±0.005% of setting for 24
hrs
50 Hz to 20
kHz
1 -mV 10-mV, and 100-mV
ranges
50 Hz to 20
Output
voltage
50 Hz to 20
1
Combined accuracy and load regulation.
1-V, 10-V, and 100-V ranges 20 to 50 Hz
1000-V range
20 to 50 Hz
and
20 to 110 kHz
10 to 20 Hz
kHz
and
20 to 110 kHz
10 to 20 Hz
kHz
20 to 50 Hz
and
20 to 50 kHz
10 to 20 Hz
50 to 110 kHz
±(0.04% of setting +0.002% of range
+ 10µ V)1
±(0.07% of setting +0.005% of range
+50µ V)
±(0.22% of setting +0.005% of range
+50µ V)
±(0.032% of setting +0.002% of
range +10µ V)
±(0.062% of setting +0.005% of
range +50µ V)
±(0.212% of setting +0.005% of
range +50µ V)
±0.04% of setting
±0.08% of setting
±(0.2% of setting +0.005% of range)
±0.15% of setting
SECTION II
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment used in this
calibration procedure. This equipment is issued with Secondary Reference Standards
Calibration Set NSN 4931-00-621-7878 and is to be used in performing this procedure.
Alternate items may be used by the calibrating activity when the equipment listed in
table 2 is not available. 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 standa rd and TI
5. Accessories Required. The accessories listed in table 3 are issued as indicated in
paragraph 4 above and are to be used in this calibration procedure. When necessary,
these items may be substituted by equivalent items unless specifically prohibited.
3
TB 9-4931-700-50
Table 2. Minimum Specifications of Equipment Required
Item
A1 AC/DC VOLTMETER
A2 AUTOTRANSFORMER
A3 DECADE RESISTOR Range: 22 to 3010 ohms Biddle Gray, Model 601147-1
A4 DISTORTION
A5 FREQUENCY
A6 LOAD (CALIBRATOR
A7 OSCILLOSCOPE Sensitivity: 0.01 to 20 V/cm
A8 RATION
A9 THERMAL TRANSFER
A10 VARIABLE
1
Combined accuracy of A1 and A9: ±0.0087%.
Common Name
(DIFFERENTIAL
VOLTMETER)
(VARIABLE POWER
TRANSFORMER)
ANALYZER
(SPECTRUM
ANALYZER)
COUNTER
(ELECTRONIC
DIGITAL COUNTER)
LOAD)
TRANSFORMER (AC
RATIO STANDARD)
STANDARD
CAPACITOR
(VARIABLE
CAPACITANCE
STANDARD)
Item
B1 ADAPTER (POWER ADAPTER) 2 to 2-wire isolation plug (7912356)
B2 ADAPTER (ELECTRICAL PLUG
CONNECTOR)
B3 ADAPTER (CONNECTOR
ADAPTER)
B4 ADAPTER (TIP JACK
ASSEMBLY)
B5 CABLE (RF CABLE ASSEMBLY) 30-in., RG -58( )/U with BNC plug terminations
B6 CABLE (RF CABLE ASSEMBLY) 36-in., RG -58( )/U with BNC plug to alligator clips
Common Name
(Official Nomenclature)
Minimum Use
Specifications
Range: 0.002 to 1850 V dc
Accuracy: 1
Capability: Use as null detector
Range: 105 to 125 V ac
Accuracy: ±1%
Range: 10 Hz to 100 kHz
Accuracy: Measure less than
.06% (Must have amplifier
capability)
Range: 9.8 Hz to 119 kHz
Accuracy: ±0.5%
Range: 2200 ohms
Accuracy: ±5%
Sweeptime: 2 ms to 10 ms/cm
Capability: Divide to 7 places
Accuracy: ±0.0085%
Range: 1 to 100 V dc 1 to 100 V
ac
Accuracy: 1
Range: 100 and 200 pF General Radio, Model 1422D
Table 3. Accessories Required
(Part Number)
Double banana plug to BNC jack terminations
(7907592)
Double banana jack to phone plug adapter (7907566)
GR plug to binding posts 874Q2 (874Q2)
(7907467)
(7909410)
Manufacturer and Model
(Part Number)
John Fluke, Models
887ABAN (887 ABAN) and
80E10 (80E10)
General Radio, Model
W10MT3AS3 (7910809)
(7910328)
Hewlett-Packard, Model
334A (7911957)
Systron-Donner, Model
1037M (7910823) w/Timer
Interval Unit, Model 1926A
(7910824)
MIRCOM, Model SKA-4850-
101
Tektronix, Model RM561A
(7910655-2) w/3A6 plug-in
(7911441-1) and 3B4
(7912040-1)
Gertsch, Model 1000
(7907060-1)
Ballantine Laboratories,
Model 1600A (MIS-10554-
2)
(8579475)
Description
4
B7 CABLE1 (RF CABLE
ASSEMBLY)
TB 9-4931-700-50
30-in., RG -58( )/U with double banana plug
terminations (7907470)
5
TB 9-4931-700-50
Table 3. Accessories Required - Continued.
Item
B8 CABLE (TEST LEAD) 36-in., RG -58( )/U with BNC plug and double banana
B9 HOOK-UP WIRE (ELECTRICAL
POWER CABLE)
B10 ISOLATION BOX (ADAPTER
BOX)
B11 PROBE Tektronix, Type 010-0128-00 (010-0128-00)
1
Three required.
Common Name
(Official Nomenclature)
Description (Part Number)
plug terminations (7907471)
Shielded pair No. 18 AWG, solid copper (MIS-10312)
Double banana jack terminals (SKD4850-3)
SECTION III
PRELIMINARY OPERATIO NS
6. Preliminary Instructions
a. The instructions outlined in this section are preparatory to the calibration
process. Personnel should become familiar with the entire procedure before beginning
the calibration.
b. Items of equipment used in this procedure are referenced within the text by
common name and item identification number as listed in tables 2 and 3. For the
identification of equipment referenced by item numbers prefixed with A, see table 2, and
for prefix B, see table 3.
WARNING
HIGH VOLTAGE is used during the performance of this
calibration. DEATH ON CONTACT may result if personnel
fail to observe safety precautions.
NOTE
Unless otherwise specified, verify the results 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, TM 9-4931-700-14/1, and TM 94931-700-14-2 for this TI.
NOTE
Unless otherwise specified, all controls and control settings
refer to the TI.
6
TB 9-4931-700-50
7. Equipment Setup
a. Connect TI to autotransformer (A2).
b. Connect autotransformer to 115-volt ac (alternating current) and adjust its output
control to obtain a 115-volt output.
c. Set LINE switches to ON and allow 1 hour for equipment to warm-up and
stabilize.
SECTION III
CALIBRATION PROCESS
NOTE
When indications specified in paragraphs 8, 9, 10, or 12 are
not within tolerance, perform the power supply check in
paragraph 13 prior to making adjustments. After
adjustments are made, repeat paragraphs 8, 9, 10, and 12. If
indications specified in paragraph 11 are not within
tolerance, the power supply check in paragraph 14 prior to
making adjustments. Do not perform power supply checks if
all other parameters are within tolerance.
8. Frequency Accuracy
a. Performance Check
(1) Connect TI front panel output to input of frequency counter (A5), using cable
(B8).
(2) Position TI controls as listed in (a) through (d) below:
(a) Press FREQUENCY RANGE X10 pushbutton.
(b) Adjust FREQUENCY control to obtain FREQ scale indication of 1.
(c) Press VOLTAGE RANGE 1V pushbutton.
(d) Set voltage controls to obtain indication of 1.000000 V.
(3) If frequency counter does not indicate between 98.0392 and 102.041 ins
(milliseconds), perform b below.
(4) Repeat technique of (2) and (3) above , using settings and indications listed in
table 4
7
TB 9-4931-700-50
Test Instrument Frequency Counter Indications
Frequency FREQUENCY RANGE
Settings Switch Setting Minimum Maximum
2 49.0196 ms 51.0204 ms
3 32.6797 ms 34.0136 ms
5 X10 19.6078 ms 20.4082 ms
7 14.0056 ms 14.5773 ms
10 9.8039 ms 10.2041 ms
1 9.80392 ms 10.2041 ms
2 4.90196 ms 5.10204 ms
3 X100 3.26797 ms 3.40136 ms
5 1.96078 ms 2.04082 ms
7 1.40056 ms 1.45773 ms
10 980 Hz 1020 Hz
1 980 Hz 1020 Hz
2 1960 Hz 2040 Hz
3 X1K 2940 Hz 3060 Hz
5 4900 Hz 5100 Hz
7 6860 Hz 7140 Hz
10 9.8 kHz 10.2 kHz
1 9.8 kHz 10.2 kHz
2 19.6 kHz 20.4 kHz
3 X10K 29.4 kHz 30.6 kHz
5 49.0 kHz 51.0 kHz
7 68.6 kHz 71.4 kHz
10 98.0 kHz 102.0 kHz
b. Adjustments
Table 4. Frequency Accuracy
(1) Press FREQUENCY RANGE X10K pushbutton and adjust FREQUENCY
control for FREQ scale indication of 1.0.
(2) Adjust A12C2 (fig. 1) to obtain indication of 10.000 kHz (kilohertz) on
frequency counter (R).
(3) Adjust FREQUENCY control slowly clockwise while observing frequency
counter indication. If frequency increases, proceed to b(6) below. If frequency
decreases, proceed to b(4) below.
(4) Repeat (1) above.
(5) While observing frequency counter indication, adjust A12C2 (fig. 1) to obtain a
second 10 kHz output frequency (R). If a second 10 kHz cannot be obtained by adjusting
A12C2, readjust A12C2 to obtain original 10 kHz frequency. While observing frequency
counter indication, adjust A12L1 (fig. 1) in direction that causes output to decrease and
pass through 0 (zero) Hz (hertz) and increase to 10 kHz. Adjust A12L1 to obtain
indication of 10.000 kHz on frequency counter (R).
8
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