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Date
Re: Anyone tried using a CW syntesizer as frequency marker with 8510C?
HP8350B module has DC-FM capability. With an external PLL with correct settings, it can be locked use the AUX YIG signal from the back. However make it work with 8510 require some additional works, a
By Yue · #126571 ·
Re: HP 8662A Power up - overvoltage shutdown
Yes, current sense resistor is in spec. It¡¯s not the current foldback that is tripping the supply as far as I can tell. It¡¯s an over voltage on the linear supply input to the -40V rail.
By Tony · #126570 ·
Re: HP 8662A Power up - overvoltage shutdown
Yes, my belief was that UK mains voltage had 220V as the lower side and could go to 240V or more as you say. I don¡¯t think that is the circuit - I¡¯m referring to the A7A1 PCB circuit with three
By Tony · #126569 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi Tony In the UK the actual mains voltage is NOT 230VAC, it is frequently nearer to, if not over 250 VAC. When the UK harmonised with the EU 230VAC we did not change our mains voltage, just the
By george edmonds · #126568 ·
Re: first post - new home lab - tips on using HP/Agilent gear
Interesting.- thank you Mark. I don't mind DIY, if I had a schematic. I would appreciate a suggestion if we can convert it 50 ohm distribution. That's a resistor network at the end of the signal path
By Samudra N3RDX S21X · #126567 ·
Re: first post - new home lab - tips on using HP/Agilent gear
I found a very hiqh quality detailed breakdown video on YouTube.about *GE Interlogix? Kalatel?KTS-250-16* (my unit) https://youtu.be/PjFr5YfxfLE by W2AEW (2015)
By Samudra N3RDX S21X · #126566 ·
Re: first post - new home lab - tips on using HP/Agilent gear
Samudra, I did this with a KTS-250 (the smaller version, setup as 1 input x 8 outputs) and I changed everything to 50 Ohms... works great. Not sure you need to though. Have the schematic somewhere in
By Mark Bielman · #126565 ·
Re: HP 8662A Power up - overvoltage shutdown
I've done further checking. The machine is rated for use in the UK at 230V,and the main selector voltage switch is set correctly and the two fuses are rated correctly (2.5A and 0.5A). I checked the
By Tony · #126564 ·
Re: first post - new home lab - tips on using HP/Agilent gear
Thanks for the precise instructions - I will do that this coming weekend after another session of home renovations in the new place is complete. I'm bookmarking this.
By Samudra N3RDX S21X · #126563 ·
Re: first post - new home lab - tips on using HP/Agilent gear
Thank you Michael, yes, I think they are 75-ohm, so ¡­ at short distances (in the same rack) what can I do to match the 50-ohm interfaces with the test equipment. I bought this years ago, and
By Samudra N3RDX S21X · #126562 ·
Re: first post - new home lab - tips on using HP/Agilent gear
Oh, forgot about the need to terminate the _unused_ outputs, been a long time. I grew up with thick ethernet, CSMA/CD 10 Mbps, so should have remembered the water pipe flow paradigm. So, if we have GE
By Samudra N3RDX S21X · #126561 ·
Re: 53181A 3 GHz prescaler from China
Thanks for the input.? I ordered one from China.? I will see what happens.?? As Lothar said, it is worth $40 to take a chance.? I am sure they were all built off the same plans available on
By Tom B · #126560 ·
Re: HP 8662A Power up - overvoltage shutdown
My guess would be that something else in the control loop is faulty. Because it kind sounds like it is working ok in a steady state condition,?but not to transients. Or is conditionally stable. There
By EI2KU · #126559 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi Tony I should have said. the mains voltage sensors are VR1 and VR2.? Use ONLY a none grounded instrument such as a hand held DMM to make mesurements around them.? Use of Grounded instruments such
By george edmonds · #126558 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi Tony The overvoltage sensors are VR1 and VR2, has one gone faulty? G Edmonds
By george edmonds · #126557 ·
Re: HP 8662A Power up - overvoltage shutdown
A question or so: 1) is the equipment supposed to run at 230 VAC?? Are you in a region where you could get 240?? Is it specified for that? 2) any idea if it's a supply triggering this, or a general
By Harvey White · #126556 ·
Re: HP 8662A Power up - overvoltage shutdown
Digging a bit more I find that the PSU will start successfully at 220V AC and at 225V AC. But at 230V AC and above it throws and over-voltage error. Not quite sure where to take it now... Tony
By Tony · #126555 ·
Re: first post - new home lab - tips on using HP/Agilent gear
If I'm not mistaken, the designer of the 8671/8672 is (or at least was) on this mailing list. Perhaps he'll chime in. -Dave
By Dave McGuire · #126554 ·
Re: HP 8662A Power up - overvoltage shutdown
I have not measured it to be frank. But both of the above tests were with the variac set to 230V - either powering on the instrument and turning it up gradually, or otherwise setting the variac to
By Tony · #126553 ·
Re: HP 8662A Power up - overvoltage shutdown
Hi Tony What is your actual mains voltage? G Edmonds
By george edmonds · #126552 ·