开云体育

Hello everyone! I have been wanting to get my 535A into calibration, but according to the manual I need an EP53A gain set adapter which I will also use with my 533A and my 545A when the time comes. However, I am not finding much information about these units. Does anyone have a schematic or even know if one could be made from scratch? Or is there a way to work around needing this gain set adapter? I looked in the forums and I did not find anything about it. I did find a pdf file on 013-0005-00 and in the parts list very few parts with a .1uf 400V capacitor and a 220K 1/2W resistor and a lug.

Please help as I would like to get my 535A into service! Thanks so much!

Brenda

I doubt that you will ever find a EP53A. Look for a TU-7 which is the EP53A and a pulser combined to cal the 535/545 scopes. Actually the TU-7 works for most 500 series scopes. How many plugins do you have for your 535? The TU-7 is used to standardize the gain of the 535 mainframe as well as adjust the risetime response of the 500 series scopes. So if you only have 1 plugin you can just set the gain of the plugin as outlined in the manual for the plugin and everything will be just fine. If you have more than 1 plugin then just pick one as the "standard" and then adjust the others gain to match. Read the description of the TU-7 on . This will give you a better idea of what this plugin does.
The TU-7 is really only necessary if you have multiple plugins being used with many 500 series scopes.
Bill

Hello everyone! I have actually managed to find a EP53A! It's in very nice condition other than some of the "fingers" are a little black. I was able to take this apart as I wanted to make sure that the capacitors and the resistor was still good and within tolerance. There were 2 .1uf capacitors marked GOOD-ALL, and I was able to test them for leakage with my version of Mr. Carlson's capacitor leakage tester. The value was also well within tolerance. The 220K resistor is another story. That resistor is way out of tolerance which was 10% at 299K, so that must be replaced. I have looked at previous posts and have gotten myself all confused about types of resistors to use. I do have 220K 1/2W resistors that are carbon film, would these be okay to use?