High Voltage SourceMeter Instrument Reference Manual Section 15:
Frequently asked questions
2470-901-01 Rev. A / May 2019 15-15
What should I do if I get an 5074 interlock error?
The instrument provides an interlock circuit on the rear panel. You must enable this circuit in order for
the instrument to set source voltages greater than ±42 V DC. If you try to assign a high-voltage output
and turn the source on when the interlock is not asserted, you see event code 5074, "Output voltage
limited by interlock."
The 2470 is provided with an interlock circuit that must be positively activated in order for the
high voltage output to be enabled. The interlock helps facilitate safe operation of the
equipment in a test system. Bypassing the interlock could expose the operator to hazardous
voltages that could result in personal injury or death.
If the safety interlock is not asserted and the source is turned on, the following actions occur:
• The nominal output is limited to less than ±42 V.
• The front-panel INTERLOCK indicator is not illuminated.
To recover from this error, properly engage the interlock using a safe test fixture before turning on the
2470 output.
You can only use the high-voltage outputs when the interlock is asserted. If you try to assign a
high-voltage output and turn the source on when the interlock is not asserted, you see event code
5074, "Output voltage limited by interlock." Note that the SOURCE screen displays the value that was
selected for the voltage source, but the source value is limited to less than ±42 V.
See Using the interlock (on page 4-3
) for more information.
How do I trigger a sweep?
Sweeps are set up as a trigger model, so to start the sweep, initiate the trigger model. You can initiate
the trigger model from the front panel by pressing the TRIGGER key.
What are source limits?
The source limits (also known as compliance) prevent the instrument from sourcing a voltage or
current over a set value. This helps prevent damage to the device under test (DUT).
The values that can be set for the limits must be below the setting for the overvoltage protection limit.
This limit can also be restricted by the measurement range. If a specific measurement range is set,
the limit must be more than 0.1 percent of the measurement range. If not, an event is generated and
the limit is automatically changed to an appropriate value for the selected range. If you set the
measurement range to be automatically selected, the measurement range does not affect the limit.
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