Section 4: Sourcing and measuring
2470 High Voltage SourceMeter Instrument Reference Manual
4-16
2470-901-01 Rev. A /
May
2019
Output-off state
Carefully consider and configure the appropriate output-off state, source, and limits before
connecting the 2470 to a device that can deliver energy, such as other voltage sources,
batteries, capacitors, or solar cells. Configure the settings that are recommended for the
instrument before making connections to the device. Failure to consider the output-off state,
source, and limits may result in damage to the instrument or to the device under test (DUT).
When the source of the instrument is turned off, it may not completely isolate the instrument from the
external circuit. You can use the Output Off setting to place the 2470 in a known, noninteractive state
during idle periods, such as when you are changing the device under test. The output-off states that
can be selected for a 2470 are normal, high-impedance, zero, or guard.
When you change the output-off state, the selected output-off state is set immediately. When the
instrument is powered on, the instrument is momentarily in the high-impedance output-off state
before going to the default output-off state of
n
ormal or a setting defined in a power up script.
Regardless of the selected output-off state, if an overtemperature condition violation occurs, the
instrument goes into the high-impedance output-off state.
When the output is off, the SOURCE area of the home screen shows the source value that is set, not
the value that is presently being output.
Normal output-off state
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
