Forum - Recent Threads

KEL103 SCPI Programmers Manual

rpmarchand — Wed, 06 Jan 2021 14:06:38 GMT

Hello Element14,

I'm trying to track down either a copy of the Programmer's Manual for either of the following electronic loads below. i have tried to find them on the manufacturer's website but without much luck. does someone on here have them?

- Korad KEL103 Programmer's Manual

- Multicomp Pro MP710259 US

Even if there was a list of SCPI commands somewhere that would be fine. i found some good help on github but it's not complete. Specifically i'm trying to automate setting the resistance value of the load in CR mode and not having much luck.

thanks!

RE: KEL103 SCPI Programmers Manual

Gert_Lauritsen — Thu, 25 Sep 2025 14:09:52 GMT

Just mad a wrapper for it github.com/.../KE103

RE: KEL103 SCPI Programmers Manual

genebren — Sat, 25 Sep 2021 01:55:07 GMT

The multicomp DC loads are very similar to other products on the market (like the Kel103). I did find some communication protocols manuals from a similar model (very likely the same protocol). Here is a link to the site with the manuals.

https://www.distrelec.biz/en/electronic-dc-load-120v-30a-300w-rnd-lab-rnd-320-kel103/p/30126024

There is a download for "Communication Commands with Computer.pdf" which looks like what you may have been looking for.

RE: KEL103 SCPI Programmers Manual

fmilburn — Wed, 14 Apr 2021 15:14:47 GMT

Thanks for the information Michael. The instrument is currently on sale but I found the old thread you referred to and think I’ll pass.

RE: KEL103 SCPI Programmers Manual

michaelkellett — Wed, 14 Apr 2021 09:09:58 GMT

I did a search (Google and others) and can find no reference anywhere to a programming manual.

Without it the instrument is almost worthless.

I'm utterly amazed that Farnell/Avnet.Newark aren't on to this - having a range of Multicomp "Pro" instruments without the basic support is not good at all.

It might be worth trying to talk to the product manager for the instrument - pleae let us know if you do get anywhere.

I've avoided buying any of this range of parts, despite the low prices, because of the problmes with documentation.

Of course R & S, Keysight and Keithley have it easily locatable and downloadable on the web. Rigol aren't too bad but there are things missing from their docs (like port address for SCPI over LAN).

RE: KEL103 SCPI Programmers Manual

fmilburn — Wed, 14 Apr 2021 00:10:09 GMT

Hello,

I am interested in the MP710259 and am curious if you found a document with the SCPI commands.

Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

meera_hussien — Wed, 12 Aug 2020 09:01:59 GMT

Hi,

Recently I bought Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker. But the transformer was no longer there(i guess that's why they sell it for a very cheap price). I try contacting the Huntron if by any chance i can buy a new transformer. Unfortunately, they no longer support the model I bought. Has anyone worked with this model before?

[View:/resized-image/__size/717x538/__key/communityserver-discussions-components-files/63/contentimage_5F00_141667.jpg:717:538]

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

michaelkellett — Wed, 12 Aug 2020 20:59:23 GMT

You could make a replacement for T3 !

It looks like a typical scope type mains transformer.

You need to find out what the secondary high voltage winding is meant to deliver, careful reading of the serivece manual can get you there.

The same winding makes 340V rectified and uses a voltage multiplier to make the 1350V HT.

The AC voltage on the winding will be 240V.

This will be hard to find, so I suggest you use 2 x 230V primary to 6.3V secondary type transformers. Wire them mains : 6.3:6.3:230V, you can take the fillament voltage from the mid point and the HT from the second transformer.

If you use torroidal transformers you can tune the ratios by adding turns to one of the 6.3V windings, the first if your outputs are too low and the second if too high.

You can easily add turns by winding some insulated wire around the outside (going through the hole of course,).

I would be happy doing all this but if you don't have some experience with working with 1.3kV, fully understand what I'm getting at, and have some test gear (meter and scope with high voltage probes) then best leave it.

Hope this helps, good luck.

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

meera_hussien — Wed, 12 Aug 2020 19:52:44 GMT

Hi Shabaz,

I manage to find the same schematic. As you have mentioned, the missing transformer is the T3 transformer and it is quite hard to find the replacement. Maybe i need to find another solution to solve this problem.

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

meera_hussien — Wed, 12 Aug 2020 19:45:26 GMT

I manage to find the schematic online. And it looks like i am missing the main transformer.

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

meera_hussien — Wed, 12 Aug 2020 19:43:27 GMT

I have found the schematic. Based on that, it seems like the device is missing the main transformer.

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

shabaz — Wed, 12 Aug 2020 18:47:39 GMT

Hi Mohamed,

There's a PDF service manual here, circuit diagram is below since it's doubtful anyone will claim a copyright on this it is four decades* old.

Hopefully it's T2 which is missing, since that's easiest to find a replacement for. T1 could be replaced experimentally (maybe winding your own), and T3 would be hard to find (high voltage plus a low voltage secondary) although something could be adapted, a lot of effort perhaps, but definitely looks like fun!

* I like this 1980's ad.. apparently, in 2021, people will still be using tapes : )

https://www.youtube.com/watch?v=uU75D5rZ_I8

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

DAB — Wed, 12 Aug 2020 18:14:17 GMT

See if they can provide you with a schematic.

There could be a lot of potential in this item and a lot of fun to see if you can repair and use.

DAB

RE: Huntron Tracker HTR 1005B-1 Pulse Generator/Signal Tracer Component Checker

michaelkellett — Wed, 12 Aug 2020 15:42:10 GMT

It probably isn't worth fixing to use for its original purpose - it might be fun to play with.

Which transformer is missing, mains or signal.

Have you found a service manual for it ?

RE: BK1103A Switch Help

Gough Lui — Wed, 21 Nov 2018 23:29:35 GMT

It's always a nice feeling when you can fix something without having to crack out the soldering iron and actually do any surgery. Preserves the original look and feel as well, while making sure things don't go to waste before they absolutely have failed.

- Gough

RE: BK1103A Switch Help

kas.lewis — Wed, 21 Nov 2018 22:39:55 GMT

I ended up with two different contact cleaners after talking with a few vendors at the Sensor Midwest/SMTA show in Chicago last month. After using the cleaner from ACL Staticide and working the switches a bit the issue seems to be resolved. I'm very impressed how the cleaner was able to penetrate the switch as I didnt think I could get anything between the housing and the "lid" of the switch. I used an xacto blade to get a slight opening and sprayed what I could inside. I can now get all the buttons to respond correctly.

I hope this is helpful to others who may have the same issue.

FYI I believe you can request samples non their website if its just a small amount needed.

Kas

RE: BK1103A Switch Help

korn — Sun, 14 Oct 2018 19:38:21 GMT

for guitar amps I like to use a cleaner that clearly states "leaves no residue" to flood the switches and controls.

then work them out, clicking or turning many times..

then give a second wash and a blast of compressed air before I go back and carefully hit each switch with a cleaner that says "lubricant"

here are my favorites...

RE: BK1103A Switch Help

jw0752 — Sun, 14 Oct 2018 16:13:35 GMT

Hi Kas,

I have seen in the past where switches similar to these have a release that allows the internal contacts to slide out to the front. This made it easy to clean the wipers and internal contacts with a small brush. If I remember correctly it involved pushing the spring out of the way and lifting a pin. There are so many varieties and I can not see from your picture if these are the same or not.

John

BK1103A Switch Help

kas.lewis — Fri, 12 Oct 2018 17:54:26 GMT

I recently bought a second hand function generator and after checking it out it all appears to work well except for some of the switches. I was therefore hoping someone may be able to help me identify the make and model of the used switches. If I can replace them then I will have a perfectly good function generator, well minus the calibration (1993...)

[View:/resized-image/__size/1200x900/__key/communityserver-discussions-components-files/63/contentimage_5F00_103107.jpg:1200:900]

This is a picture of the switch I 'm looking to replace. It's a six pin switch and appears that the upper and lower center are the two poles and the outer terminals are the four throws.

[View:/resized-image/__size/1200x900/__key/communityserver-discussions-components-files/63/contentimage_5F00_103108.jpg:1200:900]

The function generator in question, awaiting its repairs.

Thanks

Kas

RE: BK1103A Switch Help

mcb1 — Sun, 14 Oct 2018 11:03:52 GMT

kas.lewis

From what I recall of these switches, the rear is open.

If you can desolder them from the board, you have some other options, but I think you can try the squirt the heck out of them first.

As Gough Lui said, you can simply squirt contact cleaner into them and then operate them several times.

This will quickly show if the switch is the issue, or if something else is the cause.

Contact cleaner tends to clean but leave the surface dry, and it is better to have a film on the surfaces that protects them.

Electrolube make some products that apply a coating that is electrically conductive.

I couldn;t find it on the nz element14 website but thi is what I was thinking https://www.electrolube.co.nz/products/contact-lubricants/eml/contact_cleaner_lubricants/

Apart from the mains switch, these switches are unlikely to be carrying any current so you're safe from the excess becoming conductive and causing other issues.

They may have a mechanical interlock, which might need some greasing with a suitable plastic lubricant.

I tend to use CRC 808 Silicon Spray now as it is a dry lubricant so therefore doesn't attract dust.

It apparently works well on car door seals as well.

Mark

RE: BK1103A Switch Help

Gough Lui — Sun, 14 Oct 2018 09:21:20 GMT

Well, some contact cleaner is pretty "volatile", and liquidy, so you can just soak the whole switch assembly through the cracks while pushing the switch continuously so the contacts "rub" away any of the oxide. You can spray through open cracks if you can find any ... excess eventually evaporates.

This can work, although I've found on some older switches, can be a little temporary as well.

- Gough

RE: BK1103A Switch Help

kas.lewis — Sun, 14 Oct 2018 09:17:46 GMT

mcb1,

I was wondering about cleaning out the old switches and that in some ways would be the best solution. The question I had was how to go about opening them without damaging them. In some ways I don't have much to loose on the other hand it sort of kinda works... (Read as chicken). That might just be the best bet. I'll look into this option when get a few minutes of downtime.

Kas

RE: BK1103A Switch Help

mcb1 — Sun, 14 Oct 2018 05:58:58 GMT

I'm wondering if a good clean and lube won't bring back the switches to their former glory.

It's entirely likely that the contacts that were uncovered have suffered from oxidation, and with cleaning and manipulation might bring them back.

A further spray of a lubrication type compound will ensure they remain in good condition.

Mark

RE: BK1103A Switch Help

Gough Lui — Sun, 14 Oct 2018 01:51:14 GMT

kas.lewis - I can't find an exact replacement - but going through my local element14 site, there seems to be a few "compatible" looking candidates (minus the support legs). Suggest you verify the voltage/current requirements, and distance between button flange and PCB pins, and footprint of the switch to ensure it can fit:

Your local suppliers may have a bigger variety of DPDT push-button solder-type switches, and there may be a chance of finding an exact replacement.

- Gough

RE: BK1103A Switch Help

kas.lewis — Sun, 14 Oct 2018 00:55:26 GMT

updated

Thank you,

Kas