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If I am correct in a quick interpretation in the service manual the power switching comes from MOSFETs located on the processor board which distribute the power to the remainder of the instrument.

Attilio, I use Pete Millett's software.? It is no where near an Audio Precision GUI but I credit Pete and am thankful for his effort in providing this for all 8903B

Sorry for a bit OT. Before I waste my time advertising on the test-equip-trader; would anyone be interested in waveguide items? WR90 (10GHz), some lower frequency, some higher (25GHz? I will have to

Sorry for a bit OT. Before I waste my time advertising on the test-equip-trader; would anyone be interested in waveguide items? WR90 (10GHz), some lower frequency, some higher (25GHz? I will have to

Agree w/Greg on the poor service manual. No schematics! You need to investigate the "soft start" circuit. There should be a standby supply voltage present for that to work. This repair video talks

the battery is 3v.https://youtu.be/KV6pEl5kAUw I measured the battery connected and the device is not connected to the 220 v sector. my device a month ago works well I was on vacation when I came back

Thank you so much Radu, I have already downloaded Agilent VEE version 9 and version 15 libraries and installed them on my PC. I also downloaded Pete Millett's four programs for HP8903B. I don't know

Hi Dave, Your belief is correct. GW Pickard’s patent 836531 shows an early version of what later became the standard diode symbol. The anode and cathode assignments happened later — initially, it

Well I pulled the cover off and unsoldered on lead from the switch.? Sure enough it was open.? I hit it with some deoxit from the top where there was a grove going in and worked it a bit and it

My apologies. I May have misunderstood your issue. I was thinking about the internal battery option for use of the instrument without any mains power applied. The 2.9V you measured most likely

OK, we have replaced the diode in our 8471A, and learned a few things along the way. In my preceding descriptions, I had Anode and Cathode reversed (for the standard Negative Output model). It is

I have a E4418B power meter that uses the E9287A battery. It is a 12V battery. Does your meter use the same?? Part number and normal voltage should be printed on a label on it.?? If yours is the

I get a hint the op may not be very familiar with digital logic, so I need to mention the idea of inverted logic values where true is low or ground. The data sheet or schematic shows this as a bubble

The scope came with A.02.08 firmware which I believe is the latest. ?Updated my old scope with this firmware and it works fine. ?If I get time tomorrow I’ll upload the firmware images to the files

The following photos have been uploaded to the 8471A Internals ( /g/HP-Agilent-Keysight-equipment/album?id=272489 ) album of the [email protected] group. *

I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and

Atilio, You may also want to look into Pete Millett's software - http://www.pmillett.com/hp_8903_software.htm. No affiliation, but wanted to save you the time to search. You'll also need a HPIB/GPIB

This analyzer has not 4400 hours but 6278 and does have the original display tube. Price 1550 Euro Payment through paypal. best regards Peter

PIC would do it if the PIC had A/D converters. Looks as if the PC utility is the way to go.? No sense duplicating work unless you need something different. Good luck with how it works. Harvey

For sale is one of Hp's top models. It goes from 9khz to 26.5Ghz. It is synthezised controlled analyzer and measuring / counting frequency down to 1 Hz resolution. It is an A model that has a