[AMRadio] [Glowbugs] Re: [AWA] Tek 535/545 vertical amp calibration question

Larry Szendrei ne1s at securespeed.us
Wed Nov 1 07:25:36 EDT 2017

On 10/28/17 12:26 PM, Michael Hanz wrote:
> Just make one - it seems pretty simple: 
> https://groups.io/g/TekScopes/topic/951626?p=,,,20,0,0,0::,,,0,0,0,951626
> On 10/28/2017 9:41 AM, Larry Szendrei ne1s at securespeed.us 
> [antiquewirelessassociation] wrote:
>> I wonder if anyone has any tips for how to calibrate the vertical
>> amplifier on a Tektronics 535 and/or 545 oscilloscope without the EP53A
>> Gain Set Adaptor called for in the manuals' procedure?

A final note on this topic that may prove helpful to anyone who needs to 
calibrate the vertical amp on one of these fine old, but beastly, 

Using the information in the link that Mike provided (see above), I was 
able to take one channel of a spare, unused type CA dual-trace plug-in I 
had and convert it to calibrate the vertical amps in both my 535A and 
RM45 'scopes. One input of the plug-in now bypasses its amplifier and 
accepts a signal from the internal calibrator to set the sensitivity of 
the mainframe vertical amplifier to 100mv/cm. After calibrating the 
mainframe amp I calibrated the plug-ins (two more type CAs and one type 
K). After (and despite) the repair/maintenance dose to the scopes, which 
in the case of the RM45 was quite extensive, the calibrations weren't 
that far off.


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