[Test-Equipment] Simple DC Voltage Standard?

[Barry]

I appreciate all the input.  I plan to get a couple of the standards chips (5V and 10V) and put together my own board.  It's certainly simple enough.

No, I didn't like the idea of using a battery, but it was about all I could come up with.

Thanks again guys,

Barry - N4BUQ


 On Mon 28/02/11  9:47 PM , "Gary Schafer" garyschafer at comcast.net sent:
> I evaluated one of Joe's boards a few years ago and they are not bad.
> Theydo change with supply voltage and especially ambient temperature. You
> haveto pay close attention to air currents in the room and need a stable
> roomtemperature. But that is only if you are getting down into the low
> millivolts calibration range. 
> 
> I have an HP3456A DVM and a Fluke transfer standard, both of which are
> pretty stable for comparison purposes.
> 
> But for a small DVM calibration or an analog meter they will be fine and
> youdon't have to worry about temperature.
> 
> The cheapest way to go is to buy one of the voltage reference chips
> fromMouser and build it on a small board. It only takes a couple of
> resistorsand a cap. It is best to feed it from a small regulated supply. The AD587
> isone chip. They are only a few dollars and come in different voltages.
> Rightout of the box without any trim pot attached they will be plenty close
> enough for an analog meter calibration.
> 
> Short of that I would use your fluke DVM to calibrate the 410 against.
> 
> I, like Eric have also measured 1.5 volt AA batteries and find new ones
> tobe in the 1.6 volt range.
> 
> If I remember right the calibration procedure for the old heathkit vtvm
> wasto use a 1.5 volt battery as a reference at 1.5 volt. That was a C cell
> andthey may be closer to 1.5 volts but I haven't checked any in a long
> time.
> 73
> Gary  K4FMX