TB 9-5915-214-35
10. Stopband Attenuation
NOTE
If TI covers have been removed, the covers need to be re-
installed to minimize outside distortion.
a. Performance Check
(1) Connect calibrator to INPUT CH 1.
(2) Connect true rms voltmeter to OUTPUT CH 1 using 6 kHz high-pass filter.
(3) Press TYPE parameter key until CUTOFF FREQUENCY display indicates bu.
(4) Press INPUT(db) ’ and OUTPUT GAIN(db) ’ control keys until displays
indicate 00.
(5) Press MODE parameter key until CUTOFF FREQUENCY display indicates h.P.
(6) Press corresponding keys as listed in (a) through (c) below and verify CUTOFF
FREQUENCY indicates 1.000.
(a) 1 data entry key.
(b) KILO parameter key.
(c) FREQ parameter key.
(7) Adjust calibrator for a 20 kHz, 3 V output and reference true rms voltmeter to 0 dB.
(8) Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.
(9) If true rms voltmeter does not indicate 80 dB or less, perform b below.
(10) Repeat technique of (1) through (9) above for CH 2.
b. Adjustments. Perform adjustments as indicated in Section IV if not previously
performed.
11. Noise Level
NOTE
If TI covers have been removed, the covers need to be re-
installed to minimize outside distortion.
a. Performance Check
(1) Short INPUT CH 1.
(2) Press INPUT(db) ’ and OUTPUT GAIN(db) ’ control keys until displays
indicate 00.
(3) Press MODE parameter key until CUTOFF FREQUENCY display indicates L.P.
(4) Press TYPE parameter key until CUTOFF FREQUENCY display indicates bu.
(5) Press corresponding keys as listed in (a) through (c) below and verify CUTOFF
FREQUENCY indicates 2.000.
(a) 2 data entry key.