TB 9-6625-2119-35
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Multimeter, AN/USM-451 (Ballantine, Model 9632M). The manufacturer's
manual and TM 11-6625-2953-14 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. Some of the earlier models have a twist wire capacitor instead
of a screw type for the 200 V ac frequency compensation adjustment C52 and the 2 V ac
b. Time and Technique. The time
required for this
calibration is
approximately 1
hour 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. 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.
Test instrument
parameters
Performance specifications
Dc voltage
Range: 0 to +1000 V in 5 ranges
Accuracy: (0.2% of reading +1 LSD)
Ac voltage
Range: 0 to 1000 V in 5 ranges
Accuracy: 200 mV, 2, 20, and 200 V ranges, 40 to 420 Hz (0.5% of reading +5
LSD); 200 mV, 2, 20, and 200 V ranges, 420 Hz to 1 kHz (2% of reading
+5 LSD); 200 mV, 2, 20, and 200 V ranges, 420 Hz to 10 kHz (1% of
reading +5 LSD); 1000 V range, 40 to 420 Hz (2% of reading +5 LSD),
420 Hz to 1 kHz; (3.75% of reading +5 LSD)
Dc current
Range: 0 to 10 A in 6 ranges
Accuracy: 200 A range, (1% of reading +1 LSD); 2, 20, 200, 2000 mA and 10 A
ranges, (0.75% of reading +1 LSD)
Ac current1
Range: 0 to 10 A in 6 ranges
Accuracy: 200 A range, 40 to 420 Hz +(3.5% of reading +5 LSD), 420 Hz to 1 kHz
(5% of reading +5 LSD); 2,20, 200, 2000 mA and 10 A ranges, 40 to 420
Hz (1.5% of reading +5 LSD), 420 Hz to 1 kHz (4% of reading +5 LSC)
Range: 0 to 20 MΩ in 6 ranges
Accuracy: 200 Ω, 2 Ω, 20 Ω, 200 Ω, and 2000 kΩ ranges (0.5% of reading +1 LSD);
20 MΩ range, (1% of reading +2 LSD)
1Ac
current verified when dc current and ac voltage checks are performed.