"Too_Many_Tools" wrote in message
s.com...


** Groper alert !

I have a well stocked test bench at home containing a range of analog,
digital and RF test equipment as I am sure most of you also do.

Well the question I have is how do you handle the calibration of your
equipment? What do you use for calibration standards for resistance,
voltage, current and frequency?


** A few 0.1% precision resistors does the first job for DMMs.

A Natsemi " LH0070 " 10.000 volt ( +/- 0.02% ) voltage reference IC with
0.1 % resistor divider chain giving 1.000 & 0.1000 volts for the DC volts
ranges DMMs and scopes does the second.

For AC volts, a scope screen with internal graticule is used to establish
the p-p amplitude of a sine wave - then it can be used to check then AC
ranges DMMs etc - to a 1% accuracy.

A 12MHz crystal oscillator ( 11.99993 MHz @ 25C ) checks the DFM -
calibrated using an off air standard frequency transmission picked up on a
scanner.



........ Phil