Pstat.SetAchFilter()

Type: INSTANCE FUNCTION

Purpose: Pstat.SetAchFilter() sets the two-pole Butterworth low-pass filter on the auxillary measuring channel.

If the parameter passed by SetAchFilter is a frequency in Hz, the driver then selects the most appropriate filter setting able to pass information corresponding to this frequency.

NOTE: Do not use the No Filter setting (0) under normal circumstances. It is to be used exclusively for AC impedance measurements beyond 100 kHz.

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, BOOLEAN, or a string constant that translates into an INDEX or BOOLEAN. See the tables below.

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

String	Constant Value	–3 dB Frequency
PC5_FilterOff	0	No filter. Passes maximum EIS frequency.
PC5_FilterFast	1	200 kHz filter
PC5_FilterMedFast	2	10 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.

FilterSet

The return value FilterSet is an INDEX or a BOOLEAN. The tables above 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.