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SG503: Difference between revisions
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The frequency counter is built from a 10131 ECL prescaler followed by 7490 TTL BCD counters and 7-segment decoders (display not multiplexed). | The frequency counter is built from a 10131 ECL prescaler followed by 7490 TTL BCD counters and 7-segment decoders (display not multiplexed). | ||
==Links== | |||
* [http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_500/SG503.htm SG503 @ amplifier.cd] (German) including measurements of cable influence (1 m Belden H-155 as replacement for original cable) | |||
==Pictures== | ==Pictures== | ||