[time-nuts] HP-531xx counter calibrator boards

[Mark Sims]

The PCB's for the new (and hopefully improved) time interval calibrator board have shipped.  They should be here early next week.   

The boards can do the Offset, Gain, and Fine time interval calibration steps in the HP 531xx calibration menu and replace the unobtainium HP-59999-J06 time interval calibrator and high dollar signal generator.   You would still need a precise 10 Mhz source to calibrate the OCXO reference.  If your counter uses only the ultra-crappy the standard reference... you don't need bother messing with calibration ;-)

As per the HP application note, you can also use it to figure out systemic channel errors in other counters.