TB 9-6625-2353-35
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Digital Multimeter, AN/PSM-45 and (Simpson, Model 467) and Simpson,
Model 467E. The manufacturers' manuals or TMs 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. Variations among models are described in text, tables, and
figures.
b. Time and Technique. The time required for this calibration is approximately
1 hour, using the 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
0 to 1000 V in 5 ranges w/probe 5000 V
Range:
(0.1% of input +1 count) probe 5%
Accuracy:
Ac voltage
Range:
0 to 750 V in 5 ranges w/probe 0-5000 V
200 mV, 2, 20, and 200 V ranges, 20 to 40 Hz, (1.5% of input +5
Accuracy:
counts); 40 Hz to 1 kHz, (0.5% of input +5 counts); 1 to 5 kHz, (5% of
input +5 counts) 750 V range, 20 to 40 Hz, (1.5% of input +5 counts);
40 to 400 Hz, (0.5% of input +5 counts) probe 5%1
Dc current
0 to 2000 mA in 5 ranges. 10 A w/shunt
Range:
200 A, 2 and 20 mA ranges, (0.5% of input +1 count)
Accuracy:
200 and 2000 mA ranges, 10 A w/shunt (0.75% of input +1 count)
.25% for shunt
Ac current2
0 to 2000 mA in 5 ranges. 10 A w/shunt
Range:
200 A, 2 and 20 mA ranges, (0.5% of input +1 count)
Accuracy:
200 and 2000 mA ranges, 10 A w/shunt (0.75% of input +1 count)
.25% for shunt
0 to 20 MΩ in 6 ranges
Range:
200Ω, 2, 20, 200, and 2000 kΩ, (0.25% of input +1 count)
Accuracy:
20 MΩ, (1% of input +1 count)
Probe not calibrated on Ac.
1
Ac current verified by dc current check because current measurements of ac and dc are made using same shunt resistor.
2
