15: Frequently asked questions 2470 High Voltage SourceMeter Instrument
15-12 2470-901-01 Rev. A / May 2019
When the 2470 is set to the normal output-off state, the following settings are made when the source
is turned off:
• The measurement sense is set to 2-wire
• The voltage source is selected and set to 0 V
• The current limit is set to 10% of the full scale of the present measurement function autorange
value
• If source readback is off, Output Off is displayed in the home screen Source area
• If source readback is on, the actual measurement is displayed in the home screen Source area
• If measurement is set to resistance, dashes (--.----) are shown in the home screen Source area
• The Source button on the home screen shows the value that will be sourced when the output is
turned on again
When the zero output-off state is selected and you turn off the output:
• The measurement sense is changed to 2-wire
• The voltage source is selected and set to 0
• The range is set to the presently selected range (turn off autorange)
• If the source is voltage, the current limit is not changed
• If the source is current, the current limit is set to the programmed source current value or to 10%
full scale of the present current range, whichever is greater
When the zero output-off state is selected, you can use the instrument as an ammeter because it is
outputting 0 V.
When the high-impedance output-off state is selected and the output is turned off:
• The measurement sense is set to 2-wire
• The output relay opens, disconnecting the instrument as a load
Opening the relay disconnects external circuitry from the inputs and outputs of the instrument. To
prevent excessive wear on the output relay, do not use this output-off state for tests that turn the
output off and on frequently.
The high-impedance output-off state should be used when the instrument is connected to a power
source or another source-measure instrument. In some cases, it may also be appropriate for devices
such as capacitors.
When the guard output-off state is selected and the output is turned off, the following actions occur:
• The measurement sense is changed to 2-wire
• The current source is selected and set to 0 A if the source is set to current (amps); otherwise, the
out
put remains a voltage source when the output is turned off
• The voltage limit is set to 10% full scale of the present voltage range
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