Recent Posts

1

Beginners / Re: FLUKE 189, 289, 789

« Last post by coromonadalix on Today at 01:55:34 am »

1st   dont mix  the 187 189   with the 287 289 series  they are not built the same

if by miracle they share the same protocol  ... that's another thing, i dont catch what you mean by real protocol ??    they are defined in the following

a better google search  give this
https://www.uniteng.com/neildocs/facilities/Fluke289_remote_spec28X.pdf

or

visual studio  you see the commands
https://www.vbforums.com/showthread.php?835765-VS-2010-How-do-I-talk-to-a-Fluke-289-DMM

http://craftsman-hambs.blogspot.com/2010/02/fluke-189289-dmm-connect-to-computer.html

2

Test Equipment / Re: Tek 2465 Horizontal Sweep Issue

« Last post by kellymcdonald78 on Today at 01:49:03 am »

Brilliant idea using the scope itself on pin 18 (scope, heal thyself). I’m not seeing any change in voltage on pin 18 (I checked at variety of timing settings). Not seeing any change on pin 9 of U735 either,  which should be the  A sweep from U-700. I get a near constant -1.24 volts here. Tried swapping U700 and U900 again but no change

3

Test Equipment / Re: Fluke 8842A multimeter stuck in remote mode

« Last post by J-R on Today at 01:42:58 am »

Does the unit have a GPIB interface installed?  You could try removing it as a test.
Local button does nothing?
What happens if you try the full self-test?

4

Test Equipment / HP 3585a Spectrum Analyser throws "Calibration Error 17" error

« Last post by timshoe on Today at 01:37:55 am »

I just got an HP 3585a from a fellow Ham because it quit working and he was tired of lugging an 88 lb door stop around. After a couple days work, I tracked down the problem to a shorted tantalum cap on the A26 board that was pulling down the 15v supply. The unit seems to work well now except that it keeps trying to do a calibrate every few minutes and throws a "Calibration Error 17". I went through the manuals and found the error code, but not much information on what causes it.

Has anyone seen this problem and fixed it? I searched the web with no joy.
Thank you.
Tim

5

Beginners / Re: Oscilloscope recommendation

« Last post by BillyO on Today at 01:32:11 am »

"good examples about four channels coming handy for automotive work"

While I'm not an auto tech, I have seen many automotive oscilloscopes that have 8 channels.  Like this from Hantek: https://www.hantek.com/products/detail/13170

I think Pico have them too.  Others too.

Must be a reason for it.

[.FileFunction]

6

KiCad / Re: How can I design this THT footprint?

« Last post by Doctorandus_P on Today at 01:28:48 am »

I had a look at the Gerber X2 standard.

Apparently there is a .FileFunction  for Plated routing. It's also possible to specify a depth (between which layers) or PTH.

Plated,i,j,(PTH|Blind|Buried) [,<label>]

Plated drill/rout data, span from copper layer i to layer j. The from/to order is not significant. The (PTH|Blind|Buried) field is mandatory. The label is optional. If present it must take one of the following values: Drill, Rout or Mixed


But as far as I know, there is no direct support in KiCad. I guess you can draw it on a user layer, and then modify the .FileFunction with a text editor, but this is clearly not optimal. I also have doubts about general support of the more exotic features of the Gerber format by PCB manufacturers.

7

Test Equipment / Fluke 8842A multimeter stuck in remote mode

« Last post by raymond008 on Today at 01:27:32 am »

Hi,
I recently got a fluke 8842A bench top multimeter.
Somehow, it get stuck in 'Remote' mode with no other digital display.
Does it means it failed to power up reset or it is actually locked to 'Remote' operation only?
Any hint?
Thanks.

8

Beginners / Re: Oscilloscope recommendation

« Last post by tatel on Today at 01:26:56 am »

Wondering about good examples about four channels coming handy, I guess there will be some.

One example that immediately comes to mind is power efficiency measurements:  you would need to measure voltage and current on both the input and the output, so 4 channels would be needed.

You are right, of course. My bad: I should have said "good examples about four channels coming handy for automotive work" So far it's clear to me that, for automotive work, CAN decoding isn't strictly necessary; and that, while 1-channel oscilloscope is enough to do most of the tasks, there's at least one case when having a 2-channel oscilloscope comes handy. Then I was wondering about a case where more than 2 channels would be "needed". Since there are 4-channels automotive oscilloscopes for sale, one would think there's a motive for that.

9

Test Equipment / Re: Fluke 8060A Somewhat Functional

« Last post by J-R on Today at 01:25:42 am »

My first thought is check the 1K fusible resistor R2.

Beyond that, I would suggest checking every function and range since then you will have a really good idea of which part of the schematic is the likely culprit.

10

Beginners / Re: A not too expensive DC Power Supply

« Last post by IanB on Today at 01:19:15 am »

Your question is still shrouded in mystery, confusion, and obfuscation.

Think they are looking for a +/-100V 1A PSU for said opamp.
So either one unit or two 100V units that can be strung together.

Seems quite dangerous.

Still not clear whether they want a lab power supply to do experiments on the bench, or whether they want a fixed power supply module to incorporate in a project?

How hard would it be to say something like: "I am designing a project to do X, and to that end I am planning to include this op amp, manufacturer/part no. Y, and to power my project I will need an off-the-shelf DC power supply module that can provide +/- 100 V at up to 1 A. Any suggestions about where to look for such a module?"

Then at least some reasonable answers might be forthcoming.

But as you say, working as a (presumably) beginner on a project using such dangerous voltages is a recipe for an early demise.