TB 9-6625-121-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for the
calibration of Digital Multimeter, Fluke, Model 787 Process 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 1000 V dc
Accuracy: (0.1% of rdg +1 dgt)
Ac voltage
Range: 0 - 1000 V ac
Frequency Range: 45 Hz to 500 Hz
Range: 400 mV through 1000 V
Accuracy: 45 to 50 Hz, (1.2% of rdg + 4 dgts);
Range: 400 mV
Accuracy: 50 to 60 Hz, (0.7% of rdg + 4 dgts);
Range: 4 through 1000 V
Accuracy: 50 to 60 Hz, (0.7% of rdg + 2 dgts);
Range: 400 mV through 1000 V
Accuracy: 60 to 200 Hz, (1.2% of rdg + 4 dgts);
200 to 500 Hz, (7.0% of rdg + 4 dgts)
DC current
Range: 0 to 1 A dc
Accuracy 30 mA range, (0.05% of rdg + 2 dgts);
1 A range, (0.2% of rdg + 2 dgts)
AC current
Range: 0 to 1 A ac, 45 Hz - 2 kHz
Accuracy: (1.0% of rdg + 2 digits)
DC current output
Range: 0 or 4 to 20 mA dc with over range to 24 mA dc
20 mA span
Accuracy: 0.05% of span
Range: 0 to 40 MΩ
Accuracy: 400 Ω range; (0.2% of rdg + 2 digits)
4 kΩ through 400 kΩ ranges; (0.2% of rdg +1 digits)
4 MΩ range; (0.35% of rdg + 3 digits)
40 MΩ range; (2.5% of rdg + 3 digits)
Frequency
Range: 0.01 Hz to 19.999 kHz
Accuracy: (0.005% of rdg + 1 digits)