TB 9-6625-2289-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Electronic Voltmeter, AN/URM-145B and AN/URM-145C (ME-247C/U).
TM-11-6625-524-14-2 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. Variations among models are indicated in text.
b. Time and Technique. The time required for this calibration is approximately 4
hours, 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
Performance specifications1
Range
Test instrument
Voltage range
accuracy
(FS)
response
parameters
(V)
10%
.003 to 3V
20 kHz to 100 MHz
5%
AN/URM-145C (ME-247C/U)
100
to 400 MHz
15%
20 kHz to 100 MHz
.001
10%
100
to 400 MHz
1Verified
to 100 MHz for all systems codes except COO; for COO, verify to 400 MHz.
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration Standards
Set AN/GSM-287 or AN/GSM-705. Alternate items may be used by the calibrating activity. 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 listed
and TI.
