34410A/11A User’s Guide 57
Features and Functions 2
DC Input Impedance
This feature applies to dc voltage measurements only.
The default setting for the multimeter’s input impedance is fixed at 10 MW
for all dc voltage ranges, to minimize noise pickup. To reduce the effects
of measurement loading errors when making low–voltage measurements,
this fixed resistance can be set to >10 GW (HI–Z) for the 100 mVDC, 1 VDC
and 10 VDC ranges.
• Front Panel Operation: After the function is selected, press
repeatedly until INPUT Z is displayed. Press or to select 10M or
HI–Z, then press . Then step through or exit the configuration menu.
Note: when HI–Z is selected, the multimeter will only set an input
impedance of >10 GW for the three lowest dc ranges; it will
auto–default to 10 MW for all measurement ranges above 10 VDC.
• Remote Interface Operation: The following command turns on the auto
input impedance function for dc voltage measurements. The auto
function (equivalent of setting HI–Z from the front panel) uses 10 MW
for the 100V and 1000V ranges, and >10 GW for all other ranges:
[SENSe:]VOLTage:DC:IMPedance:AUTO {OFF>0>ON>1}
The following command queries the auto impedance function setting:
[SENSe:]VOLTage:DC:IMPedance:AUTO?
This query returns a “0” (OFF) or “1” (ON).
Refer to the Agilent 34410A/34411A Programmer’s Reference for
complete description and syntax for these commands.
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