开云体育

Hi, years ago I experienced drift in my 7904 and it was caused by one of the vertical channel switch ICs on board A7. After exchanging the board the drift was no more. G?ran [Non-text portions of

Hi Ancel, I have a question about this latest version. I looked at the pictures and the edge launched SMA connector looks "odd" on two accounts: 1) As near as I can tell the PC board must be about

Hi all, I still have several dozen BFR 90 here, NOS, original Siemens. If someone is interested in building this generator.... Regards, Jochen DH6FAZ Am 03.04.2016 um 09:32 schrieb 'Craig Sawyers'

Maybe the X is the "capacitors expired" indicator, or maybe if the caps were that bad, some glitching in the supplies confused the brain into turning it on sometimes. Ed

Yes, the 130 is quite a nice LC meter. I got one a few years ago, and found it to be in very close (<1-2% about as good as I could resolve on the meter) agreement with some pretty good reference caps,

There are other suitable RF transistors from NXP among others. HP's semiconductor division is part of Avago and their schottky diodes are readily available and inexpensive. Transistor base-emitter

I had a tough time finding the original NBS article so I always ask if someone needs me to host it for them now.

What ROM version is installed in your scope? I wonder if the X is an early calibration option as I found reference to a circle in the 2230 manual which I have also never actually seen. Good to hear

Was the "vertical channel switch" an IC, or a whole board that you swapped? Ed

Recently I acquired a type 130 L-C meter, date codes 1963. Accuracy seemed still quite good, judged with some length of coax as capacitors. Next I calibrated the meter using only a 0.2% 300pF

I have replaced all the Sangamo 840mic 12V electrolytics and the 2220 is now working perfectly. 7 of the 9 caps were bulging, so definitely on their way out. Thanks for all your comments.

When making low level measurements, do a sanity check by applying the probe tip to the same location as the ground clip and then to a ground near the measurement location. If the noise still shows

Ed, This seems to be a very mild version of a problem on my 7904 about a year ago, mine would drift a whole screen height, sometimes slowly and sometimes in a few seconds. Same symptom of trace and

Hi Mike, Thanks for the confirmation and suggestions. I may do the same. The scope works, but having that kind of noise on the rails doesn't make me very happy (regardless of whether the scope

Barry, I found the same sort of thing on my 2465BCT. Everything was within specification, but there was a lot of noise that was not power line related. There was / is one which does have some power

I finally got a chance to get back into the 2465B. Voltages are as close as my Fluke 25 (old style 25) will measure. 10.00 shows 9.99 so not sure if that's the meter (it isn't calibrated) but assume

Hey again y'all, I got myself a copy of "IEEE-488/1987", the IEEE-488.1 standard , and read through the HPIB tutorial another couple of times. The standard seems to fill in the gaps I was missing -

#@@%^ I thought it was fixed, but no. After a few more hours it continued to randomly drift up and down, and I saw it jump once. I could no longer blame the CRT pin - the trace was solid with

and 2N3501S

try 2N3495