Hi everyone,
I want to measure the performance of an isolated DC-DC converter.
Please see attached file......
Voltage at the input and the output (Vin+, Vin-, Vout+, Vout-) of the converter are sensed by NI9205.
Current at the input and the output (Iin+, Iin-, Iout+, Iout-) are also measured by NI9205
using 2 current sensors (1 milli Ohm resistors).
10 kOhm resisters are bias-resistor connected to the COM port.
The each measurement are performed by "dfferential mode".
I actually confirmed that the test circuit work well or not.
But the values were incorrect immediately after the converter started up!
Could you tell me why NI9205 showed incorrecd value and the solution?
Is it EMC problem...?
Thank you