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Siglent SDM3045X mA current measurement - weird behaviour
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ahope:
My Siglent 3045X is behaving odd when measuring  < 600mA.

I was trying to measure current consumption of an STM32F030K6 when I discovered some behaviour. Instead of the expected 3-6 mA current, it displayed about 10% of that - 5-800 uA.
I started to investigate. My two other multimeters showed the expected 3-6 mA, so I was starting to worry my siglent was totally out of spec.
Using my bench supply and a test setup with the 3045X, the current display on the bench supply and a handheld multimeter and a load I started testing from 3A down.
All meters were in agreement until I went below 600mA - then the 3045X would switch from the 6A scale to 600mA scale. This is where the really weird thing happens.
It will show the correct value, say 0.053 A, then switch to the 600mA scale and show 53.4 mA for about a second, then I hear a relay click and suddenly the display will be 6.58 mA.
Playing around and switching scale manually this is totally repeatable for small currents below a few hundred mA. The 600mA and lower scales will show values about 1/10 of actual current. The 6 and 10A scales are ok.

What is really freaking me out is that when manually changing scales down, it will show the correct value and scale for a second before a relay kicks in and ruins everything.

Anyone have any idea what is happening and how to fix?

The meter is a bit over a year old. A few months ago I blew the internal 10A fuse which I replaced myself. Otherwise the meter has been sitting on my bench since new.


tautech:

--- Quote from: ahope on November 04, 2018, 03:02:29 pm ---My Siglent 3045X is behaving odd when measuring  < 600mA.

The meter is a bit over a year old.

--- End quote ---
Welcome to the forum.

Since then there has been a firmware update to V5.01.01.03.
Can you confirm the firmware version you're running ?
ahope:
The firmware version was one of the first things I checked. I am running the latest  5.1.1.3. I was hoping for something more recent, its over a year old.

It could be firmware - in fact, it does look like it could be a firmware bug since it first displays the correct range and value before kicking in that relay and ruining everything.

But still looking for a resolution..
tautech:

--- Quote from: ahope on November 04, 2018, 07:25:25 pm ---The firmware version was one of the first things I checked. I am running the latest  5.1.1.3. I was hoping for something more recent, its over a year old.

It could be firmware - in fact, it does look like it could be a firmware bug since it first displays the correct range and value before kicking in that relay and ruining everything.

But still looking for a resolution..

--- End quote ---
OK, I'll shoot your findings through to tech support. Might take a day or so for an answer.
ahope:
Thanks. This one has me totally baffled.
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