Figure 1. Adjustment locations - bottom view.

TB-9-6625-1947-35 Test Oscillator Hewlett-Packard Models 654A Manual
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TB 9-6625-1947-35

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(2) Connect audio analyzer or spectrum analyzer to TI UNBAL output, using 50 Ω

feed-through termination.

(3) Position controls as listed in (a) through (d) below:

(a) FREQUENCY RANGE switch to X1K.

(b) FREQUENCY dial fully cw.

(d) AMPLITUDE control fully ccw.

(4) Adjust A2R3 (fig. 1) for a -350 mV indication on multimeter (R).

(5) Adjust A2R4 (fig. 1) for minimum distortion on audio analyzer, or at least -46 dB

on the spectrum analyzer (R).

(6) Rotate FREQUENCY dial fully ccw.

(7) Alternately adjust S2C2 and S2C8 (fig. 2) until frequency counter indicates 10.2

kHz and multimeter indicates between -340 and -360 mV (R).