Products > Test Equipment
Hewlett Packard 522B counter
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MaxFrister:
Here is a picture of the bottom of the instrument. The object on the right is a delay line.

MaxFrister:
It was a bit of a challenge to find room for the replacement caps:

MaxFrister:
Here's a pic of the high-tech selenium rectifier:

Cubdriver:
What's that towards the rear on the right side of the chassis underside picture - a stack of doorknob caps, or a tapped coil?  Despite having one for several years now I have never opened and looked at the underside.

Great pictures, too!   :-+

-Pat
MaxFrister:
That's the delay line, DL101.  Ten sections of 60mH and 68pF each.

It's part of the reset circuit.  According to the manual:

"The pulse to the Signal Gate is delayed twenty microseconds by Delay Line DL101 to give the counter circuits time to reset and stabilize before they receive the new signals."
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