TB 9-6625-111-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Digital Multimeter, Fluke, Model 78 Automotive Meter. The manufacturer's
manual was used as the prime data source 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 300 V dc
Range:
400 mV
Accuracy: (0.3% of rdg +5 digits)
Range:
4000 mV to 300 V
Accuracy: (0.3% of rdg +1 digit)
AC voltage
Range:
0-500 V ac
Frequency Range: 45 Hz to 1 kHz
Range:
0 to 500 V
Accuracy: (2.5% of rdg +2 digits)
DC Current
Range:
0 to 10 A dc
Range:
4 A dc
Accuracy: (1% of rdg + 5 digits)
Range:
10 A dc
Accuracy: (1% of rdg + 2 digits)
AC Current
Range:
0 to 10 A ac 45 Hz-1 kHz
Accuracy: (2.5% of rdg + 2 digits)
Range:
0 to 40 MΩ
400 Ω range
Range:
Accuracy: (0.5% of rdg + 2 digits)
4 kΩ through 4 MΩ ranges
Range:
Accuracy: (0.5% of rdg +1 digit)
40 MΩ range
Range:
Accuracy: (1% of rdg + 3 digits)