TB 9-6625-2288-35
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Electronic Voltmeters, AN/URM-145D (ME-247D/U) (Millivac Instruments,
Model MV-828A). 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.
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).
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications 1
Voltage ranges
Range accuracy
Frequency response
(V)
(FS)
AN/URM-145D (ME-247D/U)
.003 to 3
5%
20 kHz to
200 MHz
10%
200
to
400 MHz
(Millivac Instruments, Model
.001
10%
20 kHz to
200 MHz
MV-828A)
15%
200
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
to-one ratio between the standard and TI.
usage accessories issued as indicated in paragraph 4 above and are not listed in this
calibration procedure.
