TB 9-6625-172-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Ground Tester, Fluke, Model 1630. The manufacturer's manual was 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
Performance specifications
parameters
Accuracy1
Ground loop resistance
Range
0.025 to 0.250 Ω
(1.5 % rdg + 0.02 Ω)
0.250 to 1.000 Ω
(1.5% rdg + 0.05 Ω)
1.000 to 9.999 Ω
(1.5% rdg + 0.1 Ω)
10.00 to 50.00 Ω
(1.5% rdg + 0.3 Ω)
50.00 to 99.99 Ω
(1.5% rdg + 0.5 Ω)
100.0 to 200.0 Ω
(3.0% rdg + 1.0 Ω)
200.1 to 400.0 Ω
(5.0% rdg + 5.0 Ω)
400.0 to 600.0 Ω
(10.0% rdg + 10.0 Ω)
600.0 to 1500.0 Ω
20.0%
Accuracy2
Ground leakage current
Range
0.300 to 1.000 mA
(2.0% rdg + 0.05 mA)
1.00 to 10.00 mA
(2.0% rdg + 0.03 mA)
10.0 to 100.0 mA
(2.0% rdg + 0.3 mA)
100 to 1000 mA
(2.0% rdg + 3.0 mA)
0.200 to 4.000 A
(2.0% rdg + 0.03 A)
4.00 to 35.00 A
(2.0% rdg + 0.03 A)
Loop resistance with no inductance, external field <200 A/m, external electrical field <1 V/m, conductor centered.
1
Autorange 50/60 Hz, true rms, crest factor (CF) <3.5.
2
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
