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Qw3rtzuiop/33120a-option-001

External reference frequency option for the HP/Agilent/Keysight 33120a arbitrary function generator

33120a-option-001

External reference frequency option for the HP/Agilent/Keysight 33120a arbitrary function generator

The calibration can fail with "value range" error. I solved it by repeating the calibration 86 multiple times changing the readout frequency in small and bigger steps.

The ocxo is a used Vectron C4550A1-0213 (10 MHz, 5V).

3d Render of the PCB
Kicad 3d render pic of the rev. 1 PCB.

installed pcb

The PCB is mounted on the side. You need to drill holes into the metal to mount the PCB. The pics show the rev. 0 with two bodge wires.

installed pcb

Suitable isolated BNC jacks are Amphenol 112252.

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Created March 8, 2024
Updated May 7, 2025
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