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Hello, recently I bought a 7B85. It has most functions working but two problems: bad timebase selector and unstable delta time. This post is about the first problem: the readout was giving wrong

Hi team, A while ago I acquired and fixed a dead 2220 scope and was recently looking for (and found) the Wavestar software to grab waveform data. When I got home I spotted that my scope only has the

Mike Your initial problem sounds like a TRIGGER setting or problem with the trigger..start there and make sure you have the trigger adjusted properly Dave

Hi Ken, The oscillator circuit is not a kind of Baron von Münchhausen. No way that leakage from the HV side could pull the primary input voltage continuously to a higher voltage than the unloaded

I have a probe 6046, which doesn't work. The amplifier is ok, but in the probe the Q224 becomes very hot. All voltages are ok. There is a N-FET Q123 IFC1025, which I can't find anywhere. Who can help

Some (most?) DMMs have MOVs to protect the input of the meter. The spark might have been the MOV trying to save your meter. Get yourself a proper HV probe soon if you like working on this stuff. The

My meter has a DC 1000V range, but I have seen readings today go up to 1900V. I think I figured that the sparking during measurement was due to my bouncing fingertips when approaching the junction to

That makes sense. I knew it wasn't a problem, but couldn't figure out what it was. Thanks!

Matt, "Dumb" is not the word; "inexperienced" or "ignorant" (ie, lacking the specific knowledge) is something we all are in the beginning. Then we take it apart and we become experts! Dave (once

The TK601 should be the thermal cutout. I don't have a 503 but in my 55x and 56x scopes it is a small metal object, roughly the diameter of a quarter, usually bolted to the chassis in the area of the

Here are the measurements I took on my T620 with power off and everything still connected: Red to Blue (primary) = 3.7 Ohms Red to ground = 310 kOhms Blue to ground = 320 kOhms HV1 to ground = 202

Tom- That's a great idea. Thanks for sharing it. Phil

Interesting. ?I am going to guess there is either an overvoltage protector across the terminals of your meter, and 500V is well above the threshold. ?If it's rated for more than 500V, it shouldn't

_____i just got back in town a few days ago and picked up my tek 2232 from the post office. it works okay with a few issues, _____the first problem i notice is that when looking at lower frequencies,

Thanks a bunch Dan! I'm pretty sure it was my meter that caused the spark on the 500V, as I tried it again to make sure (that's when the fuse blew). I did stop and check the fuses in my meter but they

Howdy Ken, ? I am one of those relatively recent posters about the RM503. ?For the record, mine is still down while I work on a coil winder to wind myself a new T620 transformer coil. ? From what

You can eek a little more out of it by connecting it as an auto transformer. That will add the output signal to the input and give a bit more than 4X the FG output. Tom

Tom, David and All- Your points are all well taken and a little scrounging in the junk box yielded an audio isolation transformer of 50:500 ohm, a turns ratio of about 3.3 to 1. With the function

Hi all - I recently turned on my Tek RM503 scope after giving it a couple year break. No trace appeared. Since I hadn't used it in a while, my first thought was to get rid of it on Craigslist. I don't

Use a small power transformer to step up the output of your function generator. Most will work into the KHz range. Even better would be to use an audio transformer or you could wind a transformer