TB 9-6625-2049-35
8
(a)
50 Hz
.
(b)
ENTRY AMPTD
.
(c)
10
VOLT
.
(13) Set audio analyzer to measure distortion in dB. Audio analyzer indication will
be
≤
-65 dB.
(14) Perform (15) through (19) below for option 002 only
.
(15) Connect equipment as shown in figure 1 and set resistance standard to 470
Ω
.
Figure 1. Harmonic distortion - equipment setup.
(16) Press keys and enter values using
DATA
keys as listed in (a) through (e) below:
(a)
SIGNAL
on.
(b)
ENTRY FREQ
.
(c)
25
kHz
.
(d)
ENTRY AMPTD
.
(e)
40
VOLT
.
(17) Adjust spectrum analyzer controls to display 25 kHz fundamental and at least
four harmonics. All harmonics will be at least 65 dB below fundamental.
(18) Press
ENTRY FREQ
key and enter
190
kHz
using
DATA
keys. Adjust
spectrum analyzer controls to display 190 kHz fundamental and at least four harmonics.
All harmonics will be at least 60 dB below fundamental.
(19) Enter
1
MHz
using
DATA
keys. Adjust spectrum analyzer controls to display 1
MHz fundamental and at least four harmonics. All harmonics will be at least 40 dB below
fundamental.
b. Adjustment
. No adjustments can be made.
