Always measures 2.892V on the Fluke regardless of sleep mode, or scale set.
Auto mode is OFF
Above Fluke measurements were obtained while OLED was not inserted.
OLED inserted, and Fluke disconnected: Powered up on mA scale. Immediately reports OVERLOAD ~3254 mA. It then proceeds to slowly count down the mA, dropping about 250mA a minute. When switching DUT between sleep, and deep sleep the displayed voltage flicks around the bottom digit and then settles down to the old value.
If I set it into AUTO mode the nA and uA LEDs flicker at about 20Hz. If I switch auto-mode off and set mA mode, then it starts counting up from zero mA to 75mA. Moving to deep-sleep mode there ought to be a 1000x drop off, but it sticks around 70mA,
I like the potential of this device because I don't need to haul out all my gear to do a simple current check.
Obviously I have done something dumb, but I can't figure it out.
Please throw me a line somebody.
Sorry to be a nuisance.
Maybe a separate thread for this specific behavior which is different than what @shivams describes, but it really sounds very abnormal, never seen anything like this, especially the slowly counting up/down.
My first question would be: Did it always do this, from the very beginning?
Anyway, let's assume MANUAL mode only, with no OLED (although it should make no difference with OLED), and DMM on output. Upon power up, it should range to MA, and read typically <0.05mV with nothing attached.
If you say that it OVERLOADS in manual MA mode, that is definitely not normal, unless you're truly overloading it (3A+). it should be <0.05mV on the output.
The auto-ranging flicker could be because of temporary burden voltage during lower range overload+switching (that takes several milliseconds, and if your DUT cannot handle it, it will brown out), to avoid this you can add a diode to clamp the inputs and limit the burden voltage to the diode drop, until ranging-up is complete.
Also depending when you bought it, there are firmware updates which I recommend updating to, which can help solve some issues, particularly with auto-ranging, but not with damaged/defective opamps. The OLED readings are coming directly from the opamps output, so if the output is behaving erratically, the OLED readings will also be erratic/invalid.
If it's of any value:I spend quite a bit of time to test each unit, and ensure they are within claimed limits and:
- auto-ranging and hysteresis works going from nA all the way to mA
- offset is "0" with no DUT in all ranges
- all other functions work
- unit is powered on multiple times to check for various things and do measurements, no way it would work once then act weird later
- this ensures you should have a functional unit that does not do weird stuff when you first turn it on
What I can offer:- if we can't find a solution here (forum support), you have the option to return for me to inspect, hopefully find what's going on, and depending on what I find I will offer to repair or replace the unit.