TB 9-6625-2316-35
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Telephone Cable Test Set (TCTS), AN/GTM-12. The manufacturer's manual
and TM 11-6625-3292-40 were used as 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 4
hours, using the dc and low frequency and microwave techniques.
2. Forms, Records, and Reports
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
Range: <20Ω per 250 ft. of cable; maximum of <160Ω for 2000 ft.
Accuracy: 2.0%
Insulation
Range: >100 kΩ
Accuracy: 2.0%
Range: >10 MΩ
Accuracy: 3.0%
Crosstalk
Range: <-25 dB
Accuracy: 2.0%
SECTION II
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286. 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
standard and TI.
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