TB 9-6625-127-24
Test instrument
OFS
Limits (mV DC)
(mV)
Min
Max
795
783
807
500
491
509
100
95
105
(14) Set TI OFS to 0 V and disconnect equipment setup.
b. Adjustments. Complete all performance checks through paragraph 15 for as found
a. Performance Check
(1) Connect TI OUTPUT to audio analyzer INPUT HIGH using a 50 Ω feedthrough
termination.
(2) Set TI controls as listed in (a) through (e) below:
(a) MODE (Input) to NORM.
(b) Function to Sine.
(c) DTY to 50%.
(d) Frequency to 1 kHz.
(e) AMP to 8 V.
(3) Configure audio analyzer for distortion measurement.
If audio analyzer
indication is not <1%, perform b below.
(4) Set TI frequency to 50 kHz. If audio analyzer indication is not <1%, perform b
below.
(5) Set TI frequency to 100 kHz. If audio analyzer indication is not <1%, perform b
below.
(6) Set TI output to minimum and disconnect equipment setup.
(7) Connect TI OUTPUT to spectrum analyzer INPUT.
(8) Set TI frequency to 600 kHz and AMP to 8 V.
(9) Configure spectrum analyzer to view fundamental frequency and first three
harmonics.
(10) Adjust spectrum analyzer controls to place peak of fundamental frequency at a
convenient reference point. If the difference between fundamental frequency peak and
peaks of each harmonic is not at least 40 dBc, perform b below.
(11) Set TI frequency to 1 MHz and AMP to 8 V.
(12) Configure spectrum analyzer to view fundamental frequency and first three
harmonics.
(13) Adjust spectrum analyzer controls to place peak of fundamental frequency at a
convenient reference point. If the difference between fundamental frequency peak and
peaks of each harmonic is not at least 34 dBc, perform b below.