TB 9-6625-152-24
Paragraph
Page
AF distortion and sinad meter...............................
AM modulation analyzer........................................
FM modulation analyzer ........................................
RF spectrum analyzer ............................................
RF power meter ......................................................
ADJUSTMENT PROCESS
Preliminary instructions ........................................
Audio generator output level .................................
Voltmeter and oscilloscope DC offsets...................
Voltmeter DC sensitivity........................................
SINAD/distortion meter .........................................
Microphone amplifier level gain ............................
Modulation meter AM ............................................
Modulation meter FM ............................................
Final procedure .......................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Radio Test Set, IFR Systems Inc., models 2947 and 2947A and Marconi model
2947. The manufacturers' manuals were used as the 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. Variations among models are described in text, tables, and
figures.
b. Time and Technique. The time required for this calibration is approximately 16
hours, using the dc and low frequency and microwave technique.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.