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"Bruce" <bruce@...> writes: I hadn't considered that first possibility. Thanks for the hint! I did at some point measure a short across the -10V rail, but I wasn't able to reproduce the

Hi from Canada I have a recently acquired LCR meter, the relatively compact 4261A. It seems to have a very quirky problem. When left overnight powered off then powered up next day it runs normally for

Update: I plugged in the instrument and left it long enough for the oven to warm up. I then powered it on. No error messages appeared and the instrument sweeps fine. I provided a few test signals to

I agree that providing an uncurrent limited -10v was a mistake. Some suggestions: 1) A loose part (screw, nut, washer) that found itself a place shorting the -10v seems likely 2) A cap failure - how

Thank you, Greg. I transposed the 3 and 8, so I gave info for -2803 diodes. Similar enough for most cases, probably, but ain't the same. Greatly appreciate the correction! As to the mismatch criteria,

Hello, I've got an HP 8566B that was functioning correctly. However, after moving to a new apartment, it stopped working. The first thing I did was to check the power rails. Sure enough, the -10V rail

Some years back I was involved in the repair of a lot of electronic musical instruments, and encountered this situation quite often. Worst one was a box that was meant to be hit with a drumstick! Very

<sholland@...> wrote: This has come up many times on the eevblog forum. You can search for threads about it there. For example:

Was using the wrong adapter which was also defective. /g/HP-Agilent-Keysight-equipment/message/121755

Without knowing, I was using a 75 Ohm N to BNC adapter which was ALSO defective. CAL routine is now successful.

I understand that bit. On the HP 3478A DMM replacing the battery without maintaining voltage in the circuit caused loss of calibration and you have an inaccurate meter. If I just remove and replace

Just some additional information The individual diodes for this pair are found under part number 5082-2303. H P crosses that diode directly to a 1N5167. 5082-2303 diode specifications: Minimum

Because control boards are same, it must be configured by switches at the A3 board. You can find proper settings there, at block diagrams (pages 49-51)

Thanks for the info i have the splitter switch coming from an HP8517 , i will open my HP8511 to see the control board. IW1EPY Gianni Da: [email protected]

Mike, could you explain how did you figure out that checksum bytes are at 0x48 and 0x7a ? Do you have any knowledge what thay represent ? Im preparing HW to get flash content from my 75412A and 75421A

Hi Joel, were you successful ? I have a very similar issue with a known working 8594E. I reset the default CAL, ran the CAL with -37Hz, but the CAL routine never finishes and stay stuck at "CAL: EMI

Hi group ! I will start by saying that I really messed up here. I hope I will find help. I noticed one day that my Analyzer was not reading the right amplitude in the 100Mhz range. It did read the

If anyone is looking for these, I have one of each. Heavy to ship but FEDEX isnt bad. I hate to scrap them out, but the displays in the 3330B are worth more to me than the unit is. I would also

This fellow specializes in the 8640 and he rebuilds the frequency range gear assemblies. I don’t have any connection with him except for buying a gear range assembly.

If the battery runs down it will eventually leak and ruin the scope or DMM. I suggest you replace it.