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I double checked my DC measurements for the cathode of CR502 and the emitter of Q502 and they were the same as above. Put a scope on pin 6 of U502, and there is minimal AC. 52 mV max. These are

Quick update on this one, mostly replying for completion. I located the suggested 2N4117A from Langrex here in the UK for a measly ?3.50 which was acceptable coin for this DMM. Arrived today. Did a

... as Ozan correctly says. Raymond

I assumed you were looking with a minimal amplitude AC signal. If incorrect, you're unnecessarily complicating things and making measurements with a DC meter essentially useless. Raymond

Thanks Jim.? I don''t know where to look for the input to the attenuator so I better start reading the manual.? Your diagnosis is what I hope is the problem, since repairing that may not be as

The 86200 is a entirely different architecture as the regular HP sensors , it is a diode based sensor that contains correction constants inside a EEPROM , if I remember they were based on the 85037

Hi. Apologies if I've asked this here before, but the grey cell doesn't recall doing so... I have two 86200B 50 Ohm 10 MHz to 3 GHz detector probe assemblies (with cables) that came with my slightly

--- DC voltages do not add up to correct values, are these voltages in a state where output also has a large AC signal on it? For example cathode of CR502 is at -9.446V, which is the same node as base

The combination of 3) and 4) would indicate Q502 has open base-emitter. Raymond

First red flag is the missing seal on the top screw which indicates someone been in there before . The phaselock message normally clears once the unit warms up but it could also be a indication of a

Hi Tom, Thanks for the datasheet. I saved it for next time. This time I got lucky - another one of those resistors was open. It was the same value as the one I replaced several years ago, so I still

I sounds like there may be a problem with the reverse power protection.? There are PIN diodes in series with zener diodes to ground in the protection circuit and it sounds like perhaps one of the

Hello Lothar and HAKE community I just got cables shipped to me, and planned to use a semi rigid microwave test cable for early check out between 8671b generator and 8566b spectrum analyzer. I had a

Hi Razvan, I don't have a schematic, but mine has an Artesyn NFN40-7608. The datasheet is here. https://datasheetspdf.com/pdf-file/454677/ETC/NFN40-7608/1 Is the standby light on, or do you get

According to the manual on the Keysight site, 08562-90124 should be a complete set of the 'latest' CLIPs. The CLIP for A4 2923A prefix should be 08562-90128. You'd have to ask Dave at Artek whether

Hi Richard Artek have the 08562-90124 CLIP. Hardy Fra: [email protected] [mailto:[email protected]] P? vegne af Richard Sendt: 30. maj 2022 13:07 Til:

Hi All I'm Looking for a HP service manual for the 8562A but not the one that seems commonly available (08562-90062 for serial number prefix 2913A) my serial number is 2923A, I'm looking at the log

Hey everyone, Is there any information out there on the power supply used in these units? Mine appears to have died (I can't measure any output), and I can't find the schematic in the CLIP files. The

Hi, While trying to fix my HP8662A I'm trying to work out if?it is missing an output attenuator relay drive cable - or not. There appear to be at least two attenuator configurations in these

With the offset is set to -2.00 Vdc, the output of U502 reads -13.240. 1) anode of CR501 = -7.891 Vdc 2) emitter of Q501 = -1.0263 Vdc 3) cathode of CR502 = -9.446 Vdc 4) emitter of Q502 = 1.0324 Vdc