TB 9-4931-700-50
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Page
Voltage accuracy, regulation, and frequency
response (Model 746A).....................................
Distortion ..........................................................
Power supply (Model 745A)................................
Power supply (Model 746A)................................
Final procedure..................................................
SECTION I
IDENTIFICATION AND DESCRIPTION
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
prescribed by TM 38-750. DA Form 2416 must be annotated in accordance with TM 38-
750 for each 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).
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Output frequency range
Continuously adjustable from 10 Hz to 110 kHz in 4
decade ranges with 10% overlap
2% of setting
Frequency accuracy
0.3% and 0.3% with zero center dial
Error measurement range
0.51% of FS
Error measurement accuracy
(0.05% of setting + 10 V)
Distortion and noise
See footnote at end of table.
2
CHANGE 6
