3 Features and Functions
78 Keysight 34420A User’s Guide
Voltage Measurement Configuration
Input Channels
The meter has two independent input channels for measuring dc Volts. You can
make measurements on either or both channels, measure the difference between
the channels, or measure the ratio between the channels. Each channel has an
independent settings for null and range.
The figure on page 27 shows connections for two input channels.
– Channel 1 is the default input channel. Both channels use the same
integration time setting.
– The maximum measurable input on Channel 1 is 120V, on Channel 2 is 12 V.
– For two channel operation, the maximum voltage difference between Channel
1 LO and Channel 2 LO is ±150 V.
– For either channel, the maximum non-destructive input is ±150 V.
– If you enable input filters, the filters are active for both input channels.
Switching between the channels will reset the digital filter reading count (see
page 70).
– Front Panel operation: Toggle the input channel by pressing the Channel key
on the front panel. The CH1 or CH2 annunciator will light in the display. The
meter keeps range and null settings independently for each channel.
Choose the scan mode to alternately show the CH1 and CH2 readings. Disable
the digital filter when using the scan mode. In scan mode, the meter alternates
between the CH1 and CH2 readings every 3 seconds or for each measurement
(whichever is longer).
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