TB 9-6695-288-35
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) Connect spectrum analyzer to TI front panel MONITOR connector.
(2) Connect oscillator to TI front panel DISTORTION ANALYZER connector.
(3) Position TI controls as listed in (a) through (e) below:
(a) FUNCTION switch to INPUT LEVEL.
(b) FREQUENCY switches to 1.0 x 1K.
(c) METER RESPONSE switch to NORMAL.
(d) METER INPUT RANGE switch to 3 V.
(e) DISTORTION RANGE switch to 0 dB.
(4) Adjust oscillator frequency to 1 kHz and output level to obtain TI meter
indication of 0 dB.
(5) Adjust spectrum analyzer range to +10dB, sweep time to 20 Sec, and sweep to
CONT.
(6) Adjust spectrum analyzer control knob to peak the marker amplitude and the
frequency control for a 1-kHz center frequency. After a few sweeps, press SINGLE. Record
spectrum analyzer dB indication.
(7)
Set FUNCTION switch to DISTORTION.
(8) Adjust DISTORTION RANGE control for an upscale reading or until TI
reaches -80 dB.
(9) Add DISTORTION RANGE switch setting and spectrum analyzer dB
indication of center frequency. Total dB change will be greater than 100 dB below
indication recorded in (6) above.
(10) If fundamental rejection is not >-100 dB, perform b below.
(11) Adjust spectrum analyzer to observe amplitude of second harmonic of center
frequency.
(12) Add DISTORTION RANGE switch setting and spectrum analyzer dB
indication. Subtract this value from indication recorded in (6) above and record.
(13) Adjust spectrum analyzer to observe amplitude of third harmonic of center
frequency.
(14) Add DISTORTION RANGE switch setting and spectrum analyzer dB
indication. Subtract this value from indication recorded in (6) above and record.
(15) Calculate the induced harmonic distortion using figure 4.
14 CHANGE 1
