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The HP 8620A Sweep Oscillator is a general purpose CW and Sweep Oscillator, which with various RF Plug-In's (see HP 86200 Series RF Plug-Ins for details) operates over the range 10MHz to 18GHz. This unit was bought on eBay as part of a job lot and was not complete. I have not yet found a Manual for the 'A' version for download.

Front view of incomplete 8620A
Rear view of incomplete 8620A
Top view with covers removed
Bottom view with covers removed
The 'A' version is obviously older than the HP 8620C Sweep Oscillator and the main difference externally is the 'Start' and 'Stop' push-buttons. With the 8620C they are 'Full Sweep' and 'Marker Sweep'. Control knobs are missing and the power switch has no lens or bulb. The 'Mode' and 'Trigger' switches are both broken.

March 2010

Surprisingly on powering-up this unit with a Variac all seemed ok. The power supply provided all the correct voltage rails and the Sweep Out was the correct ramp or voltage level in Sweep, ΔF, CW, CW Vernier and Stop modes.

As I already have 2 tested 8620C Sweep Oscillators, I decided to dismantle this unit for parts. Hopefully these spares may help to keep another unit working. For details see HP 8620A Parts.

August 2019 
All the 8407A & 8410C based Network Analyser System, including the 8620A Parts, has now been Sold.