BNC 1105 Universal Counter - Manual (Page 128)

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Sets or queries the state of the low-pass filter.
Return
A single ASCII-encoded byte. 0 means OFF and 1 means ON.
Note
This will be set to OFF after *RST command
:INPut[1|2]:FILTer[:LPASs]:FREQuency?
Queries the cut-off frequency of the low-pass filter.
Return
Numeric data transferred as ASCII bytes in format with six
significant digits.
A value of 100E+3 is returned.
:INPut[1|2]:IMPedance [OHM]
Sets or queries the input impedance. It is either 50Ω or 1MΩ.
Return
Numeric data transferred as ASCII bytes in format with six
significant digits.
Note
The input impedance will be set to 1E6 OHM after *RST command.
:INPut3:COUPling?
Queries the channel 3 input coupling.
Return
A sequence of ASCII-encoded bytes:AC.
:INPut3:IMPedance?
Queries the channel 3 input impedance.
Return