SECTION 1
INTRODUCTION AND DESCRIPTION
1.1 This procedure describes the calibration of digital voltmeters (DVMs) or digital multimeters (DMMs), and includes
instruments having multifunction capability of measuring dc voltage, ac voltage, and resistance. Instruments that can be
calibrated using this procedure include, but are not limited to the items listed in Appendix A.
1.2 This procedure omits the calibration of the DMM 10
and 100
resistance ranges, and calibrates the other resistance
ranges to +0.2%. It omits calibration of the voltage ratio functions. Affix special calibration labels (NAVMAT form 4355/7A
or 4355/8A) as applicable. The instrument being calibrated is referred to herein as the TI (Test Instrument).
1.3 In the event that the user requires the calibration of the TI to a greater accuracy than that stated in Table 1, or requires
calibration of the functions that this procedure omits, the TI must be submitted to a Navy calibration facility that can calibrate
these functions to the required accuracy. It should be noted that a review of Navy usage of DVMs/DMMs reveals very limited
use of the functions that this procedure omits. It is anticipated that the requirements for such calibrations will be similarly
limited.
1.4 All comments concerning this procedure should be directed to Navy Measurement Science Directorate, Naval Warfare
Assessment Station, P.O. Box 5000, Corona, CA 92878–5000.
1.5 This procedure includes tests of essential performance parameters only. Any malfunction noticed during calibration,
whether specifically tested for or not, should be corrected.
1.6 Each plug in unit must be used with the TI with which it is calibrated. The plug in unit should be tagged, “For use with
(mfr) model, serial # only. If used with another TI, the system may not operate within the
prescribed tolerance.”
NOTE
This procedure describes the calibration of the TI up to 50 kHz. If the measurement capability of the TI is
greater than 50 kHz, affix a special calibration label stating: This TI has been calibrated up to 50 kHz only.
Table 1. Calibration Description
Performance
Specifications
TI
Characteristics
Test
Method
Direct voltage
measurements
Ranges:
V: 0 to 999
V
Tolerance:
6
V
1, 10, 100, and 1000 V:
Tolerance:
0.009% of range
100 mV:
Tolerance:
0.09% of range
10 mV range: No capability
Sensitivity: One least significant
digit (LSD) for a TI having a
lowest range resolution of
100
V, 10
V or 1
V;
otherwise sensitivity is not tested.
The TI indication is
compared to the calibrator
V dc output.
NAVAIR 17–20VQ–05
1
