TB 9-6625-2343-40
R44 NOTCH FLTR
GAIN
R38 RMS SENS
AUDIO TRUE RMS
DETECTOR AND
A52
R47
NOTCH
RMS OFS
FILTER GAIN
Figure 15. A52 board.
(6) Press TI keys as listed in (a) and (b) below:
(a) DATA 30.0.
(b) DATA SPCL.
(7) Using a tee connector, connect audio analyzer OUTPUT
HI to
TI
MODULATION OUTPUT /AUDIO INPUT and multimeter INPUT.
(8) Set multimeter to read ac volts.
(9) Set audio analyzer for an output frequency of 2 kHz at a level of 3.9 V.
(10) Adjust A52R38 RMS SENS (fig.15) for a TI display equal to the indication of the
multimeter to the third decimal place. (R)
(11) Change audio analyzer output level to 100 mV.
(12) Press TI keys as listed in (a) and (b) below:
(a) MEASUREMENT S (shift).
(b) AUDIO DISTN.
(13) Adjust A52R44 NOTCH FLTR GAIN (fig. 15) for a TI display between 99.9 and 100.1%. (R)
(14) Change audio analyzer output frequency to 800 Hz.
(15) Press TI keys as listed in (a) and (b) below:
(a) BLUE.
(b) 400 Hz DISTN.
(16) TI indication should be greater than 98 percent.
(17) Reduce all outputs to minimum and disconnect equipment setup.
Power Reference
a. Performance Check
NOTE
The TEGAM IIA measuring system must be warmed up for at
least 2 hours and connected in standard configuration prior to
taking measurements.