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Hi Razvan, thanks also for the service note. I have an E4407B, I had not noticed that it was the same second converter. Yves

Comments are based on a scan of 00141-90914, 141T mainframe S/P 1615A, printed June 1976, file downloaded from BAMA. The positive side of C6 varies with mains voltage. If the regulator is working,

Yves, thanks for the info about the 2nd converter After having installed the one bought on the bay I checked the original one on the bench and it seems to work normally I'm starting to suspect the

Sounds good to me. Mike Sent: Friday, September 13, 2024 3:01 PM To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment] HP 141T Power Supply Help Needed Dave, The

Dave, The schematic for the HP 141T shows all voltages referenced to ground.? If that is the case, you know the voltage at the positive side of C6.? It is listed as 5.9VDC.? So you can infer that

Greetings, I have an 8510 VNA system running well with an 8515A S-parameter test set. I'm trying to convert a spare 8511A (sampler only box) into an 8513A T/R test set. That should just involve adding

Make sure you also replace the gas voltage reference (used in low serial number instruments) with a zener. My favorite is a TL431 plus a 60V-80V zener to stay within the TL431's max rating. The zener

Dave, Yes the sockets have caused intermittent connections. The sockets are form Keystone Electronics P/N 4608 which are still available. It appears that the brass contacts get annealed over time and

Take care with taking voltage measurements around the 141T PSU -12.6V regulator. It is not "ground referenced" at the input.? It is essentially a floating Positive regulator with it's Positive output

Hello Yves, This second converter assembly is also used in the 8563E and also ESA E4407B spectrum analyzers. In fact I think it is common for all 6.5/13.5/26.5GHz versions. Mine had failed in the

Hi Adri, A friend of mine had a faulty 8595E, the problem comes from the option card 130. But I took the opportunity to look at the second converter, so here are some details on this module. Regards

That's Thermocouple, to be precise. Jim Ford, Laguna Hills, California, USA? Yahoo Mail: Search, Organize, Conquer

Thank you for the suggestion. Unfortunately key-down power-up still gives a blank display so it looks like it may be a power supply fault.

On the A7A3 board in the 8663A? Sig Generator there is a heat sink with a slot that holds a thermal coupler. The slot is filled with thermal compound. Underneath the TC and the heat sink was a square

I can’t remember if this was implemented in the firmware, but sometimes the “key-down” power-up would clear some of the boondoggles and get the display back. Basically from a power-off state,

I don't know if the 546xx family of scopes suffers this problem, but the 545xx family has a battery maintaining the cal data and clock. When the battery dies, you get a short lived message on the

Bill, CR1 and CR2 are mounted on the heat sink at the lower right side of the unit. These are stud mounted diodes. The anodes of these are connected to the power transformer with 2 heavy white wires.

Finally got this thing back on my bench and a little free time.? ?Assuming CR1 and CR2 are in the back left of the case near the diode board, I see about 17v here both on the AC and DC sides.? ?

Thanks, I’m having the same thought.

*The restoration of the HP 85662A was a bit more complicated.* In this case, both panels of the instrument were missing, along with the board covers and even the cover for the high-voltage module.