TB 9-6625-166-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Multimeters, Extech Models 380224. The manufacturers' 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. None.
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. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
DC voltage
Range:
0 to 600 V dc
2, 20, 200, 600 V dc
Accuracy: (1.2% of rdg +1 dgts)
AC voltage
Ranges:
0 to 600 V ac
Ranges:
200 and 600 V ac
Accuracy: (2.0% of rdg 4 dgts) (50 Hz to 500 Hz)
200 , 2, 20, 200 k , 2 M , 20 M , and 200 M /2 G
Ranges:
200 thru 2000 k rngs, (1% rdg + 4 dgts);
20 M rng, (2% rdg + 4 dgts);
200 and 2000 M rngs,(5% rdg + 10 dgts)
Range:
10 to 100 kHz
Accuracy:
(0.5% of rdg + 2 dgts)
20/200/2000 μF, 20 mF
Range:
Accuracy:
(4.0% of rdg +10 d)
10 399.9
Range:
Accuracy:
(1.5% of rdg 2 dgts)
Temperature
Range:
-20 to 400 C; -4 to 752 F
Accuracy:
(2% rdg + 2 C); (2% rdg + 4 F)
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286; AN/GSM-287; or AN/GSM-440. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio
cannot be met, the actual accuracy of the equipment selected is shown in parentheses.
