Re: TDS 500 600 700 series calibration
I keep wondering about the actual use of the NVRAM on the control PCA in these scopes. I have been extracting the NVRAMS and reading them so I have a fair selection on the dumps. I have run the units without the NVRAM (except the ones that have the Timekeeper/NVRAM and they seem to function fine. However I have moved an initialized(cold start) Acquisition pca between units and the "initialized" status follows the Acq pca. I wonder if the cal data is really stored in the NVRAM. From looking at the dumps it looks to be used mostly for storing screen grabs.toggle quoted messageShow quoted text
Having said that I could be way off base
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From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Dan Fish
Sent: Sunday, February 3, 2019 8:56 PM
Subject: [TekScopes] TDS 500 600 700 series calibration
I used to calibrate the 500MHz scopes but got rid of the AT PC and GPIB card. Still have the TM500 series plugins in the equipment list. Recently bought a TDS 584 (1GHz) with a bad display, crinkled gel between color shutter and front glass. Fixed that by removing gel. Found I could pull a length of wire (jacketed) between the layers to separate for cleaning. After display fixed found that a previous owner had thrown #3 dip switch to skip processor tests at turn on. This masks the calibration failure due to Dallas NVROM battery run down. So I have a nice pristine 1GHz DSO brick. I do have ability to copy the NVROM and put in a fresh one.
Does anyone know if the calibration procedure and equipment list for the 1GHz scopes is the same as the one I am familiar with for the 500 MHz scopes? I need to make a decision to gear up again for calibration or just put it up for sale.