19.10 MHz Reference Adjustment (Option 003)
2.Set the frequency counter controls as follows:
FUNCTION/DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .FREQ A INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A:
X10 ATTN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF (DC coupled) 5002 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OFF (1 MR input impedance)
AUTO TRIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ON 100 kHz FILTER A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF INT/EXT switch (rear panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EXT
3.On the HP 5334A/B Frequency Counter, select a 1 second gate time by pressing IGATE (iJ 1[GATE). Offset th e d’rsp ayed frequency by
MATH [SELECT/ENTER) [CHX/EEX) Ilo) ICHS/EEX) @ (SELECT/ENTER) (SELECT/ENTER). The
frequency counter should now display the difference between the frequency of the INPUT A signal and 10.0 MHz with a displayed resolution of 0.010 Hz (10 mHz).
4.Locate the FREQ ADJ control on the HP 8560A. This control is accessible through the center deck of the spectrum analyzer. See Figure
5.Remove the dust cap screw.
6.Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO for a frequency counter indication of 0.00 Hz.
7.On the HP 5334A/B Frequency Counter, select a 10 second gate time by pressing (GATE] Ilo] (GATE]. The frequency counter should now display the difference between the frequency of the INPUT A signal and 10.0 MHz with a resolution of 0.001 Hz (1 mHz).
8.Wait at least 2 gate periods for the frequency counter to stabilize, and then adjust the FREQ ADJ control on the A21 OCXO for a stable frequency counter indication of 0.000 fO.O1O Hz.
9.Replace the dust cap screw on the A21 OCXO.