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[email protected]> wrote: I did place a bid one of the Marconi instruments, but the highest bidder bid ?1 more than me. There's another on eBay UK, but that lacks a source, and the source is

Then you're lucky.? If you removed any of the RTV around the memory pins (it's noted on the layout), it's used to minimize leakage from the CMOS memory.? You may want to put it back. Harvey

Yes thanks, I have started the cal process and it seems to be happy. dan Sent: Monday, August 8, 2022 10:50 AM To: [email protected] Subject: Re: [Test Equipment Design &

The real problem with the meters is the battery damage.? Go partway through the calibration procedure (just very rough), and see if the processor will store the cal constants.? If so, you're

Thanks Eric – yep when I got it, there was battery gom all over that part of the board. I got it up and running, but this meter, as you may know, doesn’t just come up and work when the cal

Be on the lookout for a fluke 5200A and if possible the 5205 amplifier. These are currently my best AC standards in the lab. Also there is known issues on the DM5010 (battery damage on the processor

An obvious sample design to look at is https://dmmcheckplus.com/technical-information, at least to give some parameters to circumscribe what's done out there. I have not looked at the design close

I have a DM5010 that I would love to calibrate. The difficult items in the cal procedure are 190V and 700V at 200Hz. I have tried to string some standard 70V line audio transformers together and use

Thank you. I guess if one uses a fast sample and hold, the data acquisition could be done at a slower rate, as there's very little bandwidth of the signal. So there would be no need to sample at twice

If they are anything like my HP 4284A and 4285A Precision LCR meters, the uncertainty of Q is *extremely high* for a Q of 20 or more. *An example from the 4285A user manual* L = 220 nH (measured) f =

Marconi Instruments also made a well respected Q Meter (TF1245) along with accompanying Oscillators (TF1246 & 1247), they were not far behind Boonton in this and published their own booklets on Q

I seem to recall that most of the R&S LCR meters also measured Q, can't recall the tolerance on the measurement. 73 Jeff G8HUL

I built a Q meter based on the ring down method that used an atmel processor. It was originally in the Silicon Chip magazine but you need a subscription to see the back issues. It was republished in

A few ideas were presented by Lloyd Butler VK5BR (Revised 2004), on how a simple analogue Q meter (LF & HF to approx. 40MHz), could be realised and descriptions of design problems and resolutions. An

I have lots of equipment to do what I would call hobby level (non-NIST) equipment calibration. Perhaps quite a few of us can say the same but I think the one area of weakness for most of us is a

Hi: Stumbled on this Inductor Tester.? It hits the inductor with a pulse and by using a scope determines the frequency of the damped wave to get the inductance.? There are provisions for various

QDM. Idea is explained in the first article

I am not at home.When back I will give more details (catalog 1970 lf I remember)

Someone suggested Rohde and Schwarz made Q-meters, but a Google did not get me anything useful. I asked on an R&S group and got the following from someone. He gives the German name for the Q-meter (

I previously listed a video with a Ring down Q Meter, that was designed by a fellow in China and sold by mkmak222 on Ebay, he was down to six the last time I heard. The same fellow in China has