When the interlock is asserted, any measurement terminals,
including the LO terminals, should be considered hazardous
voltages, even if they are programmed to a non-hazardous
voltage or current.
WARNING
Potentially hazardous voltages of up to approximately
± 250 V may be present at any measurement terminals
when the interlock circuit is closed. To prevent electrical
shock, do not expose these lines.
You can use the Keithley Instruments connector CS-1616-3,
supplied with the 2461, to make the interlock connection
to the rear panel. You must supply connection wire. The
recommended wire is:
• 20 AWG to 24 AWG copper alloy
• 7 to 19 bare and tinned strands
• 0.20 mm
2
to 0.50 mm
2
•
Flexible vinyl, semi-flexible vinyl, polyethylene, x-linked
polyethylene, or PTFE
To ensure proper interlock operation, the combined
resistance of the external interlock switch and connection
wires must be less than 10 Ω when the switch is closed.
The interlock pin locations and connections are shown in the
following figure. The pins are:
• Pin 3: Earth and chassis ground
• Pin 2: Interlock
• Pin 1 (next to tab): +6 V DC out (current limited)
2
3
1
Pins
Test fixture
with
interlock
switch
Tab
To assemble the interlock:
1. Insert the wire into CS-1616-3.
2. Use a pair of pliers to squeeze the connector sections
together.
You cannot disassemble the connector and reuse it.
Connect
