TB 9-6625-2208-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Digital Multimeter, MIS-28709D (Beckman, Model 310) and Caterpillar,
Model 6V7070. The manufacturers' manuals and/or technical manuals 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.
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. 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 in table 1.
Test instrument
parameters
Performance specifications
Dc voltage
Range: 0 to 1500 V in 5 ranges
Accuracy: (0.25% of reading + 1 digit)
Dc current
Range: 0 to 10 A in 6 ranges
Accuracy: 0 to 2 A ( 0.75% of reading + 1 digit)
10 A ( 1.5% of reading + 1 digit)
Ac voltage
Range: 0 to 1000 V in 5 ranges
310
Accuracy: All ranges, 45 Hz to 2 kHz (0.75% of reading + 3 digits)
All ranges, 2 kHz to 5 kHz (1.5% of reading + 5 digits)
All ranges, 5 kHz to 10 kHz (2.5% of reading + 9 digits)
6V7070
Range: 0 to 1000 V in 5 ranges
Accuracy: 200mV, 2V, 20V, 45 Hz to 5 kHz (0.75% of reading + 3 digits)
200V, 45 Hz to 1 kHz (0.75% of reading + 3 digits)
1000V, 45 Hz to 500 Hz (0.75% of reading + 3 digits)
1000V, 500 Hz to 1 kHz (1.5% of reading + 5 digits)
Ac current1
Range: 0 to 10 A in 6 ranges
Accuracy: 0 to 2 A, 45 Hz to 2 kHz (1.5% of reading + 3 digits)
10 A range, 45 Hz to 400 Hz (2.0% of reading + 3 digits)
Range: 0 to 20 M in 6 ranges
Accuracy: 200 to 2 M
(0.5% of reading + 1 digit)
20 M range (1.5% of reading + 1 digit)
1Ac
current specifications are for information only (not checked in this procedure).