Hi,
So I've had Rigol DM3058e for just a little while, purchased it to measure photodiode current from 10uA to 10mA.
I discovered a bug that would cause the range switching relay to bang back and forth incessantly and contacted Rigol. After making a video of the issue, sending in my unit on their dime, and RMA guy verifying that yes he sees this same issue on their office unit, he talked to engineering and they said it's not a BUG, it's meant to work that way.
Well here's how to reproduce it, please try it on DM30XX and report if you also see it.
Set Rigol DMM into
DC Current measurement mode, Auto Range, Filter ON.
Provide constant current of 2.0mA
Increase current by 0.1mA
At 2.4mA you should start hearing relay banging and the current measurement will fail
Continue to increase current by 0.1mA
At 3.8mA the relay banging will stop and the DMM will read the value properly again.
This cannot be reproduced if your Filter is set to OFF or if you're not using Auto Ranging!
What this means is that 2.4-3.8mA cannot be measured in this configuration, making this equipment unusable when you need to use both 2mA and 20mA ranges in filtered and auto ranging mode because you don't know what the current is going to be and require averaged precision measurements.
So, would you buy a DMM that had a broken Auto Ranging and the manufacturer was telling you it's not a bug?
Link to video:
https://youtu.be/6Uf7gT3Mml0