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That is pretty bad. An ovenized crystal oscillator should be able to do at least 10^-7. – Mike Mike B. Feher, N4FS 89 Arnold Blvd. Howell NJ 07731 908-902-3831 Sent: Sunday, May 25, 2025 1:04 PM To:

It might be simpler to put a 100M ohm resistor in series with the high input on the 34401A in the High Z mode. Your 17.8V reading will now be 8.9V well inside the 10V limit for the 10V, 100M ohm

?Marko, The system may have been set up to use two sources and it’s looking for the second source. Try: Instrument State <Recall><More><Factory Preset> Regards, Steve

Hi, I've some HP specans just obtained as BER items from a local space communication site. The first one I'm looking at is an HP8561E, it powers on OK and the display is bright but the text is jittery

Got my hands on a 50GHz 8510C with test set and source, everything mounted in a mobile rack with a pullout table. When I switch it on, it says "caution: system bus address error", but them it proceeds

*Actually measuring again with a counter I come up with 10.000447* *Not to say my equipment is perfectly accurate.*

Hey there Raymond, I've done a little futzing with the power supply and the input amp on my 8902, so I'm happy to try and help where I can. I think you might get more traction on the group if you

Are you saying 4.999756 is in error?

I have been downloading files with "wget" for many years, but never used the "-c" option (I guess as long as one just downloads "regular" size files, it doesn't matter that much). It worked like a

Why is the 5 MHz in error, while the 10 MHz is correct?

Tony, If you have or can borrow one, the Fluke 8840A does High-Z up to 20Vdc. --John Gord

Thanks, Jim & Charles - Appreciate it. Where I find myself is that the 8402B manual says to look at a voltage that is around 17.8 Vdc above the -30V rail (Section 5-7 in the manual) - This pushes my

Hi, the 34401A can do >10 GΩ input R but only on the 10V and below ranges: Blue Button (Menu) On/Off (Down arrow) (Right arrow) Enter See pages 27 and 53 of the manual (well the year 2000 version

Try using the 34401A in hi-Z (high impedance) mode, Tony. I had to do that once about 10 or 15 years ago when measuring voltage in a low current circuit. Got weird results until I switched it to hi-Z

Hey All, I'm looking at an 8402B calibrator, and the manual says that the measurements need to be done with a floating DMM that has a greater than 100Mohm input impedance. The manual says to use an HP

Forgot to add the Block Diagram.

I have been troubleshooting my Network Analyzer using the E8356A, E8357A , E8358A Service Guide June 2004. This 8357 has an upgraded 700 MHz CPU. After reading and Option 015. My problem is Phase Lock

To anyone with HP 8902A expertise, My HP 8902A is in need of repair and some expert advice would be most helpful. Before going into details, I would like to hear from someone who is willing to assist.

I had given him this info offline. Nice to see you here Philip. -Dave (group owner) -- Dave McGuire, AK4HZ New Kensington, PA

I'm not a group manager, but since you have posted a message, I am pretty sure you have now joined the group. Welcome. You may want to select subscriptions on the left side of the web page, an adjust