HP 3320A Operating And Service Manual page 162

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NOTE 1: TP may be removed and a jack (-hp- Part No.1 250·1 1951
mounted in its place. A cable can be routed from this jack to the
3320A/B rear panel. This will provide an input to the varicaps for a
de voltage to control the frequency of the 20 MHz reference
oscillator.
NOTE 2: Test point voltages measured with -hp-180A Oscilloscope
using 10:1 probe.
DC voltages measured with high input resistance, low capacitance
voltmeter (-hp- 412AI.
NOTE 3: DC voltages measured with no EXT. FREQ REF applied.
A7TP1.
>
6 V
pop
when unlocked, see Reference Oscillator
Adjustment procedure. Section V.