TB 9-6625-2190-35
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Digital Multimeter, AN/PSM-45A. TM 11-6625-3199-14 and Army
Specification No. 3002838 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. None.
hour, using dc and low frequency technique.
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).
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Dc voltage
Range: 0 to 1000 V in 5 ranges (5000 V using high voltage probe)
Accuracy: (0.1% of reading + 1 digit)
(1% of reading using high voltage probe)
Dc current
Range: 0 to 10 A in 5 ranges
Accuracy: (0.75% of reading + 2 digits)
Ac voltage
Range: 0 to 1000 V in 5 ranges
Accuracy: 20 to 40 Hz; (1.5% of reading + 5 digits)
40 Hz to 1 kHz; (0.5% of reading + 5 digits)
1 to 5 kHz; (5% of reading + 5 digits)
Ac current1
Range: 0 to 10 A in 5 ranges
Accuracy:
20 to 40 Hz; (2% of reading + 5 digits)
All ranges:
40 Hz to 1 kHz; (1.5% of reading + 5 digits)
Range: 0 Ω to 32 MΩ in 6 ranges
Accuracy: 320 Ω range; (0.3% of reading + 2 digits)
3.2 kΩ to 3.2 MΩ ranges; (0.25% of reading + 1 digit)
32 MΩ range; (1% of reading + 1 digit)
1Ac
current verified by dc current check because current measurements of ac and dc are made using same shunt resistor.