*TB 9-6625-2127-35
SECTION I
IDENTIFICATION AND DESCRIPTION
2.
DA Form 2416 (Calibration Data Card)
1.
Test Instrument Identification. This bulletin
provides instructions for the calibration of Telephone
Test Set TA-885/U and Hewlett-Packard, Model 3555B.
a. Forms, records, and reports required or
The manufacturer's manual was used as the prime data
calibration personnel at all levels are described by TB
source in compiling these instructions. The equipment
750-25.
DA Form 2416 must be annotated in
being calibrated will be referred to as the TI (test
accordance with TB 750-25
for each calibration
instrument) throughout this bulletin.
performed.
b. Adjustments to be reported on DA Form
a.
Model Variations. None.
2416 are designated (R) at the end of the sentence in
which they appear. When adjustments are in tables, the
b. Time and Technique. The time required
(R) follows the designated adjustment. Report only
those adjustments made and designated with (R).
for this calibration is approximately 7 hours, using the dc
and low frequency technique.
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
parameters
specifications
Carrier level (30 Hz to 3 MHz)
Range: -61 dBm to +11 dBm
75 ohms unbalanced
Accuracy: +0.2 dB, 100 Hz to 600 kHz
0.5 dB, 30 Hz to 1 MHz
0.5 dB +10% of meter reading;
1 to 3 MHz
0.2 dB, 10 to 100 kHz
600 ohms balanced
0.5 dB, 1 to 150 kHz
0.2 dB, 10 to 300 kHz
135 ohms balanced
0.5 dB, 1 to 600 kHz
Voice level (20 Hz to 20 kHz)
Range: -80 dBm to +31 dBm
Accuracy: 0.2 dB, 40 Hz to 15 kHz (levels
greater than -60 dBm)
0.5 dB, 20 Hz to 20 kHz
Bridging loss
Voice level
Less than 0.3 dB at 1 kHz
Carrier level
Less than 0.05 dB at 10 kHz
SECTION II
EQUIPMENT REQUIREMENTS
issued with Secondary Transfer Calibration standards
4.
Set AN/GSM-286. Alternate items may be used by
specific equipment to be used in this calibration
the calibrating
procedure. This equipment is
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