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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 470Ω.
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.