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| AM503 current probe DC drift? |
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| coppercone2:
How does the drift characteristic of a AM503 amplifier look like? I left one on an hour and then plugged some current probes in and zeroed it to some microvolts on a scope. After about an hour drifted 2.5mA and 3mA I think they can use a potentiometer replacement. Does anyone know what a spec is? I know their not for low currents like this but I just wanna know if there is some kinda drift spec. set to DC coupling with high bandwidth and lowest resolution on the 15A probes. |
| coppercone2:
5.5 and 3.5ma offset now. I wonder if tis baking out humidity from the basement maybe. it keeps rising. I wonder if it will hit a rail eventually or stabilize. |
| coppercone2:
it seemed to stabilize nicely that would allow for short term measurements in the 100's of uA range eventually after a long time if you let it sit for like 4 hours. Now I am trying the P6042. This was mega drifty at startup. I think it has a lower noise floor then the AM503, but maybe more really low frequency noise. After I cleaned the probe it seemed to work better, that was dirty enough for a blackened q-tip. Will play with it for a while and see what it does. |
| coppercone2:
similarly, a P6042, has floated by 3.5mA (50mV/div) on the lowest setting since the last post, when zeroed with the front panel. |
| coppercone2:
I am starting to think its temperature based. I left the P6042 connected ot scope overnight and when I woke up it was very near 0 where I wanted it.. and it was a flat line for a while. When I opened the door to let some fresh air in, started dancing all over the place but before bed it was offset to 3.5mA. When I woke up it was approx 0, and after over shooting to 1mA it dropped down to -250uA. So it seems after a while it stays in the 1mA region. |
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