oscillation when working as current source

[vthielen]

Hello,

On my device, the output current becomes unstable when I configure the device as current source and short circuit the output to ground. This happens on both channels. The amplitude of the oscillation increases as the set current goes from +200 to -200 mA. I included an output file below (channel 2 set to -100 mA and shorted to ground). Is this a problem with my device only (and can I trade it for a new one?) Or do I need to make some changes in the feedback loop frequency characteristics? I saw that there is a digital potentiometer in the loop as well: can it be fixed in software?

Kind Regards,

Bart

0A_Voltage,0A_Current,0B_Voltage,0B_Current
+0.1543,+0.0004,+0.0117,-0.1114
+0.1525,+0.0005,+0.0268,-0.1365
+0.1503,+0.0004,+0.0320,-0.1475
+0.1485,+0.0004,+0.0000,-0.1254
+0.1492,+0.0004,+0.0000,-0.0944
+0.1513,+0.0005,+0.0000,-0.0747
+0.1530,+0.0005,+0.0000,-0.0837
+0.1522,+0.0004,+0.0009,-0.1078
+0.1495,+0.0005,+0.0300,-0.1331
+0.1484,+0.0004,+0.0427,-0.1482
+0.1466,+0.0005,+0.0000,-0.1303
+0.1486,+0.0003,+0.0000,-0.0990
+0.1512,+0.0004,+0.0000,-0.0763
+0.1546,+0.0003,+0.0000,-0.0802
....