7: Troubleshooting FAQs Model 2470 High Voltage SourceMeter Instrument
7-4 2470-900-01 Rev. B / August 2019
To change to the SCPI command set from a remote interface:
Send the command:
*LANG SCPI
Reboot the instrument.
To change to the TSP command set from a remote interface:
Send the command:
*LANG TSP
Reboot the instrument.
Why am I getting a 5074 event code?
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.
The action when the interlock signal is not asserted depends on the Interlock setting. If Interlock is set
to Off, if the safety interlock signal is not asserted, the following occurs:
• The nominal output is limited to less than ±42 V.
• The front-panel INTERLOCK indicator is not illuminated.
• You can output voltages less than ±42.
If Interlock is set to On, when the safety interlock signal is not asserted, the following occurs:
• You cannot turn on the source output.
• The front-panel INTERLOCK indicator is not illuminated.
Whenever the interlock changes state (from asserted to not asserted or vice versa), the output is
turned off.
To recover from this error, properly engage the interlock using a safe test fixture before turning on the
2470 output.
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