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It almost seems like the display is in a test mode. This first pic shows the 0-10V ramp of the first band sweep, the second pic shows the ramp voltage for each of the separate bands B, C, D, E, but

The reason the efficiency also suffers with a blip at about 40-60 MHz is that some of the incident RF from a 1mW reference source will end up in the 2.7R damper resistor via the resonant path to R1.

Here's the schematic of the early 478A sensor. You can see there is a 460pF capacitor C3? in series with a 2.7R damping resistor R1. I've added some extra detail to show that there is a short red

In the last few weeks, I've had my old HP 432A power meter on the bench along with its 478A thermistor sensor. I normally only use it about once a year to check the 1mW (50 MHz) reference on another

I am seeking replacements or substitutes for these caps: C10?? HP p/n 0180-1852 x2 C14?? HP p/n 0180-1888 x2 C20?? HP p/n 0180-1851 x2 I have tried a variety of cobbled together solutions and

Hi Jeremy, Nice thread on old stuf I hardly ever use. But now I got encouraged to do some tests as well. You certainly discovered that Appendix II of the O/S Manual of the HP432A gives instructions to

Hi folks, I have converted my HP83711B signal generator into an HP83712B and have added options. See here how I did it:

Hi all, I have a HP8757A scalar network analyzer with a display problem which has appeared after some 6 months of no use. It was previously working just fine, with a HP8350B sweep generator and the

Hi Nick, That is a computer power supply not really related to this test equipment group. Have a websearch adding "lithium charger" they are popular with people charging big lithiums and some of their

I have started a new folder and uploaded all I have New folder E 3610,1,2 A Paul Sent: 16 May 2025 17:18 To: [email protected] Subject: Re: [HP-Agilent-Keysight-equipment]

This seems to have the correct schematic and parts list...

You didn't specify which version of the schematic you had. I have 5959-5304? Edition 6 , October 2007.? Is this earlier than what you have? The document does not have a detailed component list, and

I have checked the A3A8 board as indicated in the service manual and the results seem ok. The first photo shows the result with the "A" band selected. The second photo with the high band (Instrument

I need a replacement or substitute for A1C19 (0180-2991), Sprague 67D398H020JL5A.? Mine let go in spectacular fashion, magic smoke, magic goo, pungent atmosphere. Thanks -- Joe White KW4YW

Hi to all, I am looking for a modification for the following PSU to ioncrease the voltage to 13.8V , any ideas? HP DPS-1400CB A PWS 1400W HSTNS-PD43 754383-001 DL360 G9 DL380 G9 LFF Thank you all Nick

Hi all, I have a Tek 5L4N plugin for the 5000-series scope frames which was designed to be a log audio spectrum analyzer.? it will sweep log from 20 Hz to 25 kHz, linear from 100 Hz to 100 kHz with a

AFAIK the 141/855X system never had any log frequency sweep capability. It was a lot back then just to get linear and sometimes frequency-stabilized operation. More modern SA gear had more

I had a similar problem with my 3582A: both channels showed OVERLOAD and no response. The solution was incredibly simple, some buttons on the front panel were bad (I suspected it might be the buttons

Hi, I'm currently repairing an early HP branded model E3611A DC Power Supply to give to a friend, but the schematic from the usual online sources is for later models that differ in some parts (notably

On Thu, 15 May 2025, Wolfgang Schraml via groups.io wrote: I've just downloaded the entire thing. No problems encountered. > Thanks. I'll give that a try. > > Wolfgang > >