also don't forget there is a whole group dedicated to ESR meters at... https://groups.io/g/ESR-Meters-North ... of course, there hasn't been any posts for almost 6 months.

You guessed right as regards the 485, Tom. A quick scan of the 485 Service Manual brings up the following: Where test equipment for checking and adjusting is specified, a "Dual Input Cable" is

Arlington, Virginia. What are you interested in? Reddy

My guess (and it’s only that) is that they designed it to be enough better than any DUT that you wouldn’t ever worry about the fixturing. A good stress test, e.g, would be CMRR measurements at the

Why not build one? Glenn -- ----------------------------------------------------------------------- Glenn Little ARRL Technical Specialist QCWA LM 28417 Amateur Callsign: WB4UIV

OK I can understand that. But if the parameters are able to be so loose then why is this calibration fixture specified for so many different types of modules and scopes. 465 non B, 465B, 485, 7a26,

I was in the middle of composing a reply when Raymond's post popped up. He's absolutely right. There is absolutely no need to be so fussy about matching physical/electrical lengths to the degree you

Yep, that's what I wrote earlier - "chip selects that were apparently also mask programmable". The 2316 in U430 is code at address 0x0000 whereas the other 2316 chip is the character generator and as

The HP (Vector) Network Analyzers such as the HP 8754 use cables that are matched in both electrical phase and amplitude, perhaps you can find a set or even just a pair of these cables and use them. I

There is no model in the 4xx 'scope series, much less a 7A22, that would require length matching to a maximum of 0.1". The 7A22 is a LF amplifier with a maximum bandwidth of 1 MHz, the fastest

I need this calibration fixture or something like it to calibrate a 7A22 and some 400 series scopes. This fixture is a BNC Y cable the important part is the Y side of the cable is matched length to

Thank you Siggi, I have been busy today, but I will have time to work on the scope tomorrow morning and I hope I can fix it after studying this new thread. Roger

Great job, Bill! That beast is one of the more jam-packed PIs of the series. I know what a PITA it can be to work on, so way to hang in there! --Cheers Tom -- Prof. Thomas H. Lee Allen Ctr., Rm.

Whew. After replacing the ps caps, voltages ok but various functions didn't. Function, that is. Put in the mica washer, all better. Yep, it was there for a reason, that reason obviously to correct a

Bonjour a tous: Have a blown 2465B PSU, a late SN with many nice options. Had a line startup/transistor driver issue, in debugging, have blown the main switch transistors and driver parts. I

Yup, the 2215A uses an op-amp bias loop to get away from the older arrangement that required a JFET matched pair. The ~30mA max IDSS figure I quoted is from looking at the schematic. The current

I don't know about the 2215A, but the other 2200s use an opamp. The opamp (JFET input type) provides the DC/LF path.It's overall DC-balanced by the feedback, so the JFET bias is taken care of. It has

Hey Roger, This message (https://groups.io/g/TekScopes/message/118061) has a discussion of how the 1.36/-1.25V references are developed. This does also involve a MUX and a S&H, so those are also

And lots of interesting Tek and HP free items at the bottom. have a look around and scope out (no pun intended) all the stuff we have added for you this

Gentlemen, I have followed this discussion with great interest. However, I have always had difficulty understanding how to design for optimum bias for a FET source follower. In this application, the