The HP AC-4A Decade Counters
The HP AC-4A Decade Counters
| High Resolution Picture of the HP AC-4A |
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| Click-Here for High-Resolution Display of this picture |
| A HP 521C Frequency Counter with Display Made of 5 x AC-4 Modules |
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| Click-Here for High-Resolution Display of this picture |
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| Closeup of a HP 524D Frequency Counter, measuring a 13,912,396 Hertz signal The HP 524D Counter Display was Made of eight AC-4 Decade Counters |
First Appearance of the AC-4A Decade Counters
in the 1955 Catalog
It is interesting to note that the AC-4 module is the first occurence of a sub-assembly of an instrument offered for sale by HP to their customers. Thus, the first HP OEM product.
| Page 60 of the 1955 Catalog |
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