TB 9-6625-150-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Megohmmeter Fluke, model, 1520. The manufacturers' manuals were 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
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. When adjustments are in tables the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
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
Voltage
Range:
0 to 600 V dc
0 to 600 V ac, (50/60 Hz)
Accuracy: (2% of rdg + 2 cnts)
0 to 40 Ω
Lo-Ohms
Range:
0.1 to 40 Ω (2% of rdg + 2 cnts)
Accuracy:
0 to 4 kΩ
Range:
Accuracy:
(2% of rdg + 2 cnts)
0 to 4000 MΩ
Insulation Resistance
Range:
0.25 to 100 MΩ (2% of rdg + 2 cnts)
Accuracy:
100 to 4000 MΩ (10% of rdg + 2 cnts + 1% of rdg per 1000 MΩ)
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GMS-286; AN/GSM-287; or AN/GSM-440. Alternate items may be used
by the calibrating activity when the equipment listed in table 2 is not available. The items
selected must be verified to perform satisfactorily prior to use and must bear evidence of
current calibration. The equipment must meet or exceed the minimum use specifications
standard and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the
equipment selected is shown in parentheses.