Keysight 34420A - Features and Functions

Front-Panel Operation 2
Keysight 34420A User’s Guide 61
To Make Voltage Ratio and Difference Measurements
To calculate a voltage ratio, the meter measures the voltages applied to the
Channel 1 input terminals and Channel 2 input terminals. The calculation is as
follows:
[1]
– Maximum input signal on Channel 1 is 120 Vdc, the meter will autorange on
the actual input or can be manually set.
– Maximum input signal on Channel 2 is 12 Vdc, the meter will autorange on the
actual input or can be manually set.
– Maximum voltage difference between Channel 1 LO and Channel 2 LO is 150
Vdc.
– Null, if used, is independent for each channel. An additional null
[1]
of the
difference can also be made. If null is used on either input channel, the ‘Null’
annunciator will flash when the difference function is selected. If you null the
difference, the ‘Null’ annunciator will be steady.
[1] The difference null is only available from the front panel.
Difference Ch 1 voltage Ch 1 Null–()Ch 2 voltage Ch 2 Null–()–()Null–=
Ratio
Ch 1 voltage Ch 1 Null–()
Ch 2 voltage Ch 2 Null–()
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