Explain™ Control Language > Library Routines > Instrument classes > class PSTAT

Description

Set the filter on the voltage-measuring channel.

This filter has no effect on potentiostat stability.

If the parameter passed by SetVchFilter() is a frequency in Hz, the potentiostat then selects the most appropriate filter-setting able to pass information corresponding to this frequency.

Gamry tip bulb

Do not use the No Filter setting (0) under normal circumstances. Use it exclusively for AC impedance measurements beyond 100 kHz.

Type

INSTANCE FUNCTION

Usage

FilterSet = Pstat.SetIchFilter(Freq)

Freq:

•The function argument Freq can be a REAL frequency. The filter is set so that frequency passes through the filter with less than 3 dB of attenuation.

•Alternatively, Freq can be an INDEX, BOOL, or a string constant that translates into an INDEX or BOOL. See the tables below.

FilterSet:

•The return value FilterSet is an INDEX or a BOOL. The tables below describe the return value. Note that the function does not return the REAL or string constant if one was used as the function’s argument.

Reference Family Filter Settings

String Constant	Value	-3 dB Frequency
PC5_FilterOff	0	No filter. Passes maximum EIS frequency.
PC5_FilterFast	1	200 kHz filter.
PC5_FilterNorm	2	1 kHz filter.
PC5_FilterSlow	3	5 Hz filter.
PC5_FilterGnd	FALSE	0.0 Hz. Filter output is a DC 0.0 V.

Interface Family Filter Settings