info? Micro Instruments memory voltmeter

From: Joe <>
Date: Thu Aug 8 07:03:01 2002

At 05:59 PM 8/7/02 -0700, you wrote:
>Joe wrote:
>> I picked up an intersting gadget today. It's a model 5203C Memory Voltmeter made by Micro Instruments. It has a four digit Nixie tube display and appears capture and display + or - DC or AC peak voltages. Does anyone know anything about these? It has two zero adjustments, among other things I'm trying to figure out exactly what they do. Neither of them seems to "zero" the meter in the normal manner.
>Does it affect the readings as you change the zero setting?
>After all these years, perhaps the components have drifted
>out of tolerance far enough that it doesn't zero anymore?

  Both Zero adjustments seems to have little or no effect on the zero readings but they have a large effect on the display when you're measuring a signal. IOW they seems to control gain more than zero. It appears that one controls the displayed value for the negative measurements and the other controls the display for the positive measurements but there is a lot of interaction between them.

>> Also what does "Narrow band" and "wide Band" mean? Changing the setting doesn't change the voltage range so has to be for something else.
>A guess, but a pretty safe one, would be that the AC mode
>response might extend up quite a ways and the "narrow-band"
>setting is to limit its sensitivity to AC noise for
>measuring slow-moving AC voltages like powerline AC volts.

  You're probably right. As guess as to what the cut off frequencies are?

Received on Thu Aug 08 2002 - 07:03:01 BST

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