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You can do most of the vertical and horizontal calibration with a function generator and good AC voltmeter.

Hi everybody, This little post to share my last experience with an old SC501 TM500 oscilloscope. I haven’t used it for 3 or 4 years and when I switched it on, no power and a nice smell of baked

So often scope problems are in the power supply, I thought the zener was there, and then possibly THE reference for everything. The fancy TC-zeners are seldom needed elsewhere. My fault for not

Oh, now this is becoming a problem, Jim. You mean head out to the auction sites and start looking around for calibration equipment??? I will blame you for the lightness of my wallet if this goes any

should work fine… the pic is nice….. this zener controlled the pull-up current in the final horz stage, it’s not super critical, it will just change the gain slightly, you may not need a

Great to hear ed. Glad I am OK. Thanks for the education David. I'm also glad I just purchased 200 zener 6.2 v diodes for $4 usd. I will probably never be in this situation again waiting for this

VR4341 sets the output current of both output current sources via their base voltages which biases the output transistors so it is a reference application instead of a clamp or level shift. The value

No problem then - I just didn't know where in the scope this discussion was about. Your part choice should be just fine. Ed

Hello Mike, Mark, thanks for your friendly advice. I have cleaned my local DNS resolver cache and can access http://www.i9t.net/ now through my regular ISP now. Sorry for being a pest. Should have

Hi Ed. the zener is VR4341, Tek part No. 152-0166-00. I'm not sure if the zener is used as a reference voltage. I believe it is part of the horizontal amp circuit and bridges the two balanced

Hello Keith, a few friendly hints included below. Good luck, Magnus * Yes, you can operate the so-called acquisition unit alias the lower part without the display unit. But you need to carefully

Hakan, Thank you for your help. I put my card in the 2a mode and edited the adj700.bat file. I removed the NI drivers from config.sys I am now able to run the software. Many thanks !!!

Someone here may have mentioned the issue of TC-zeners already, but if not, you should be aware of the details. Is this zener spot used as the reference for the whole power supply, or is it elsewhere

Magnus, Try accessing using dotted decimal notation your local DNS may be the culprit. Regards, Mike

Good Day, wow, it *does* work when I tried it through a US-based VPN... I have printed the content as PDF for my own reference. It does *not* work when accessing it thru a German/EU ISP! Any

Hi Ed. Thanks for the email. That is a neat trick with the NPN transistor, but I only see this as a temporary fix. I ordered a 1n5234B zener as a replacement from Mouser and will install it next week

I think you can consider the transistor B-E reverse breakdown to replace a zener diode as a permanent fix if necessary, if the circuit seems to work properly, but there are no specifications that you

Ok. I uploaded the file of the Frankenstein zener. Please no comments on the sloppy solder job. I had some trouble getting the original zener out of the board. I plan to clean it all up when I install

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the TekScopes group. File : /TEK 465B woes/IMG_3867.JPG Uploaded by :

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the TekScopes group. File : /TEK 465B woes/IMG_3837.JPG Uploaded by :