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I just looked at the Op-Servs and as I remembered the E & EL are 10MHz and do 1mV FSD whereas the F & FL are 4MHz and do 100uV FSD. Both have a switchable 100KHz low pass, neither is much good about

I was assuming 600 ohms for audio.?JimSent from my Verizon, Samsung Galaxy smartphone

All HP-400 AC voltmeters have 10 Megohms input impedance: the solid-state E/EL, F/FL, and GL, and the older hollow-state D, H, and L, plus rack versions of the latter three. The solid-state voltmeters

Hmm. 600 ohms should be plenty low enough to keep it quiet at low ranges. There may very well be something wrong there. But if that input impedance spec were a megohm or more, well.. -Dave

Hi, thanks for a lot of information. I would like to know more about RT1: you say that is a 10 ohm NTC.But, the ID in one of sides is 0033. Do you now how I can get a similar one? Thanks in advance.

Right, and silly me, I jumped on the wrong thread, or the right thread with the wrong subject. Head-slap time! Jim

Someone else is doing this mod; I’m one of the followers hoping to put it in my 400EL. Jeremy Jeremy Nichols Sent from my iPad 6.

Sposed to be 600 ohms, I think. Yep, the needle moves with nothing connected. I bought this thing at the TRW swap meet back in 1992 or 1993. I haven't used it much, but it did help me verify my own

With nothing connected? Whats the input impedance of the 400E? -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Me, too. I have a 400E and just checked it after not having used it for some time. On the most sensitive range, -60 dB 0.001 V, the needle moves around a fair amount with open input BNC, and if that

Sure, it'll fit bc it's nothing more -- at this point, in my mind -- than a simple part-for-part swap. The BNC retrofit is a complete no brainer, complicated only by the need for a ground-isolated BNC

I'm interested to hear about the low noise mod you make and if it would fit into a 400E or 400EL since they have BNC input already.

I'm interested to hear about the low noise mod you make and if it would fit into a 400E or 400EL since they have BNC input already.

Ah-HA! Yes, THAT is the scumbag. I thought his drek was vomited upon the world in the 1970s, seems it was later, in 1983. At 80 years old, it hardly seems worth choking him now, though it sure is nice

Dave McGuire, I happen to know exactly who one of the two men is: https://en.wikipedia.org/wiki/Michael_C._Jensen Vladan

That would be good. I started such a thing about eight years ago, using MediaWiki, but it was overrun by spam pretty quickly so I shut it do

USERLOCK OFF par HPIB. On Monday, April 20, 2020, 08:55:34 PM GMT+2, Pierre-Fran?ois (f5bqp_pfm) <pfmonet@...> wrote: Hello, After a long period of non use of my MMS 70k I decided to use it

That's a lot of documentation. Most of the HP/Agilent/Keysight VXI manuals that I have were downloaded from Keysight's web site, and the Tektronix ones were obtained from Tektronix. Some of it has

I had my day with optimizing "done" software once, back in the late 70's. I was an intern with United States Railway Association, the creators of Conrail. I was part of the effort that was known as

This is exactly the root cause of the many reasons why I do not use commercial software if I can possibly avoid it. (which I almost always can) -Dave -- Dave McGuire, AK4HZ New Kensington, PA