INPut{1|2}:IMPedance
Syntax
INPut[{1|2}]:IMPedance {<impedance> | MINimum | MAXimum | DEFault}
INPut[{1|2}]:IMPedance? [{MINimum | MAXimum | DEFault}]
Description
This command selects whether the input channel is terminated in 50 ohms or 1 Mohm.
Parameters
Name Type Range of Values Default Value
<impedance> Numeric 50 or 1.0E6
MIN = 50
MAX = 1.0E6
1.0E6
Remarks
l INPut or INPut1 refers to channel 1; INPut2 to channel 2.
l Specifying any value less than or equal to 75 ohms selects 50 ohms, above 75 ohms selects 1 Mohm.
l When 50 ohms is selected, the maximum input voltage allowed is ±5.125 V. If the input voltage
exceeds ~±10 Vpk, which would damage the 50 ohm terminator, a protection relay will open, changing
the actual input impedance to 1 Mohm. If this occurs, the INPut{1|2}:PROTection:CLEar command can
be sent to reset the protection relay.
l The INPut{1|2}:PROTection? command returns whether the protection relay has opened due to an
input voltage overload.
l The Voltage Overload bit in the Questionable Data Status Register will be set an input voltage overload
causes the protection relay to open. The bit is cleared by sending the INPut{1|2}:PROTection:CLEar
command to the affected channel, or by setting the affected channel's input impedance to 1 MOhm.
l CONFigure and MEASure? do not affect the input impedance.
l The instrument selects 1 Mohm impedance after a Factory Reset (*RST command) or an Instrument Pre-
set (SYSTem:PRESet command).
Return Format
The query returns the input impedance in the form +5.00000000000000E+001.
Examples
The following example makes a frequency measurement on channel 1 The input is configured for a 50
ohm termination and auto-leveling with a negative slope.
INPut{1|2}:IMPedance
206 Keysight 53220A/53230A Programmer's Reference
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