Help with strange gould DP9010 differential probe needed :-)

[RobertD]

Hello,

I recently purchased this Gould DP9010 differential probe along with a Gould oscilloscope. Unfortunately, I didn't receive any documentation. Does anyone recognize this device? The manufacturer appears to be "Koeth Elektronik," as shown in the picture. However, I can't find anything about it online. I'm particularly interested in the frequency and maximum input voltage.

What's especially confusing me is that it says "input +/- 30V" at the top and "+/- 1000V max" at the bottom. Which is correct?

[Momchilo]

Here you will find some info on page 977: https://www.worldradiohistory.com/UK/Wireless-World/90s/Electronics-World-1996-12-S-OCR.pdf

So it is not a "real" probe but an amplifier where you can connect passive probes without ground connection.

[RobertD]

Thank you very much. So i can connect 1:10 probes and will be able to directly measure my home 230V ac plug?

[Momchilo]

This is a little bit above the input limit.
If it's 240V, which is very often the case, you're already over the limit by 4V.
At 340Vp with a 10:1 probe, the voltage at the probe input would be 34V.

So be careful!

[RobertD]

  eure. It has been late. So my math skills dissapeared. I just wanted to make sure that two divider  probes will work in General.