HP 34970A manual UW f, Mx tv tzx tw tv

Chapter 4 Features and Functions

Voltage Measurement Configuration

∙exx Vxytvx bxt”: You can enable or disable the automatic

input resistance mode on the specified channels. With AUTO OFF (default), the input resistance is fixed at 10 MΩ for all ranges. With AUTO ON, the input resistance is set to >10 GΩ for the three lowest dc voltage ranges. The MEASure? and CONFigure commands automatically select AUTO OFF.

INPUT:IMPEDANCE:AUTO ON,(@103)

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The instrument uses three different ac filters which enable you to either optimize low frequency accuracy or achieve faster ac settling times.

The instrument selects the , xw” , or yt filter based on the input frequency that you specify for the selected channels.

M”x tv tzx tw tv vxxx5

Input Frequency		Default Settling Delay		Minimum Settling Delay
3 Hz to 300 kHz (Slow)		7 seconds / reading		1.5 seconds
20 Hz to 300 kHz (Medium)		1 second / reading		0.2 seconds
200 Hz to 300 kHz (Fast)		0.12 seconds / reading		0.02 seconds
∙ The instrument selects the xw”			filter (20 Hz) when the function
is changed or after a Factory Reset (*RST command). An Instrument
Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON
command) wx	change the setting.

∙ Sctxt”: First, select the ac voltage (or ac current) function on the active channel. Then, go to the Mwtvxw menu and select the slow filter (3 Hz), medium filter (CA b ), or fast filter (200 Hz) for the active channel. g“x wxyt ” “x ” y”x5

LF 3 HZ:SLOW

∙exx Vxytvx bxt”: Specify the lowest frequency expected in the input signal on the specified channels. The instrument selects the

appropriate filter based on the frequency you specify (x u tux	).
The MEASure? and CONFigure commands automatically select the
20 Hz (medium) filter.
SENS:VOLT:AC:BAND 3,(@203) fxv “x y”x /: U0

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