Pico Dev Kit Data Discontinuities

Question

Hello, I am using the emStat Pico Dev kit and have issues with jumps in the data on the 2nd WE in bipotentiostat configuration. The jumps regularly occur in the data of WE2 at certain voltages when performing a voltage sweep on WE1. WE2 has a constant bias voltage. The size of the jump varies with measured current and ranges from 200nA to 4uA. I have used other Pico dev kits and have not seen this issue. Is there any way of correcting this sort of issue with a manual calibration? I have tried the auto calibration, which has not resolved the issue. 
 The attached image shows the discontinuities in the data of i(WE2) vs E(WE1) at 0V and ~0.35V.

Hielke@PalmSens · Accepted Answer

Hi BNapier, 
 There is a firmware bug we have recently found, where the bipot channel can be 1 DAC LSB off. This would cause a LSB step as the WE1 passes through 0V, and another step as WE1 passes WE2 internally, but when this happens is not that obvious on the outside. This will be fixed in the next firmware release. 
 Luckily, I already have a build with this fix available: 
 EmStatPico_firmware_v1305_598d4b4f_bipot_DAC_fix.zip 
 Kind regards, Hielke)