Products > Test Equipment
Hewlett Packard 522B counter
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MaxFrister:
I recently picked up an new project, a Hewlett Packard 522B counter.   



So far I've given it a good cleaning and tested the 49 vacuum tubes.  Waiting on new caps and NOS tubes.
bd139:
Very cool. Interested to see how your refurb goes  :-+
AVGresponding:
Up to 200V pk-pk trigger!   :o
edpalmer42:
This is one of the very few cases where HP rebadged another company's product.  This is an EPUT (Event per Unit Time) meter from Beckman/Berkeley.  I had one long ago.  I think mine had 6 digits.

Ed
MaxFrister:


Basic specs:

Measures: Frequency, period, time interval measurement, ratio, total events
Introduced: 1953
Original price, $900 — approx. $10k in today’s dollars


Frequency measurement: 10cps to 150kcps (cycles per second, hertz has not been invented yet).
Time interval: 10uS to 27.8 hours
Includes self check

49 Vacuum tubes
Based upon AC-4A/B counter modules
Power required 260Watts
Weight 45lbs in the “portable” case

Ovenized crystal oscillator.
Stability: 10ppm per week, can be standardized to WWV (if only it still existed).
Accuracy: +/-1 count + stability

Input required +/-0.2V to 100V, positive or negative triggering.
Input: direct coupled, 1M ohm impedance shunted by 50uuF (the picofarad had not been invented).

Can provide an overflow count to allow more than 5 digits of counting
Can provide 90V to power a photo tube
With an optional circuit, can provide output for a plotter or printer


This particular unit was manufactured circa 1956 and the last cal was in 1971. 


Manual:
http://ftb.ko4bb.com/manuals/24.113.155.190/HP_522B_Frequency_Counter_Service_Manual.pdf

Manual for AC-4A/B counter modules:
http://www.hparchive.com/Manuals/HP-AC-4A-4B-Manual.pdf

HP Journal Article: Sept/Oct 1953:
http://www.hparchive.com/Manuals/HP-523B-Manual.pdf

1954 catalog entry: 
http://www.hparchive.com/Catalogs/HP-Catalog-1956-10-Revised.pdf


Related machine: 523B:
http://www.hparchive.com/Manuals/HP-523B-Manual.pdf

Related machine, HP 524B (Circa 1952):
http://www.hparchive.com/Manuals/HP-523B-Manual.pdf


HP Journal Article HP 524B, March/April 1954:
http://www.hparchive.com/Manuals/HP-523B-Manual.pdf
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