High Voltage SourceMeter Instrument Reference Manual Section 4:
2470-901-01 Rev. A / May 2019 4-3
• Make sure to follow all warnings and cautions and to take adequate safety precautions for each
s
et of connections.
• Properly terminate any cables. All unterminated cable ends must be in a safe enclosure.
• See Two-wire local sense connections (on page 4-8) and Four-wire remote sense connections
(on page 4-10) for examples of connections.
• For information about the interlock, see Using the interlock (on page 4-3).
Using the interlock
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. When the safety interlock signal is
asserted, the following actions occur:
• All voltage ranges of the instrument are available.
• The green front-panel INTERLOCK indicator is on.
However, when 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 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.
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.
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