Products > Test Equipment
Phillips/Fluke PM3394 Combiscope Help
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AutogolazzoJr:
Hey, a few months ago I bought a used Phillips pm3394 200mhz combiscope (for 130 USD, good deal) and have some questions on it.
1. How to use the z-mod input on the back?
2. I'm not sure if it is a pm3394A or pm3394B. How can I tell?
3. When the oscilloscope turns on, the traces don't appear in the center of the screen. Once the instrument warms up (The software won't say "warming up" anymore when the autocal is pressed) the traces gradually move towards the center of the screen and align. What is wrong here? Is this normal?
Thanks to anyone who gives an answer!
AutogolazzoJr:
Bump
ArthurDent:
This may or may not help but the 287 page service manual is available as a free download. It doesn't look like it tells you much about the operation.

http://elektrotanya.com/fluke_pm3370a_3380a_3382a_3384a_3390a_3392a_3394a_sm.pdf/download.html
wn1fju:
1) The Z-mod input is used to (dynamically) vary the intensity of the trace.  I have never found an occasion to use it, but if you google "oscilloscope
z-modulation," I'm sure others have.

2) Doesn't the label above the CRT tell you whether it is a PM3394A or PM3394B.  My "B" model is clearly marked, and besides, the "B" model also says
"25 GS/s repetitive sampling," unlike the "A" model.

3) My PM3390B (2-channel variant) also exhibits a baseline shift of about 2 minor ticks upon startup and returns to the center in about 10 minutes.  Must
just be the nature of the beast.
AutogolazzoJr:
Thank you! I got the z mod working by applying about a volt of dc to the back bnc connector. My oscilloscope says phillips on it, not fluke, so I'm not sure what model it is. It doesn't say A or B on it. I'm glad that the shift of 2 ticks is fine, and not a problem. Once again, thanks a ton.
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