Interlock connections using external source
Use a +5 V external power supply with a ±5% tolerance. The 2601B-P-INT interlock requires
approximately 125 mA to operate.
Use a two-conductor low-voltage cable to connect the +5 V source to the low-voltage remote switch.
The recommended cable is 22 AWG (20 AWG maximum) with 1.2 mm to 1.6 mm outer diameter.
Figure 26: External source interlock connections
Wiring the interlock mating connector
Use the Keithley Instruments CS-1616-3 Safety Interlock Mating Connector supplied with the
2601B-PULSE to make the interlock connection to the 2601B-P-INT. You must supply connection
wire. When using the CS-1616-3 interlock mating connector with a Keithley instrument, use the
following recommendations for choosing a connection wire:
• Copper alloy
• 7 to 19 bare and tinned strands
• 0.25 mm
2
to 0.50 mm
2
, 20 AWG to 24 AWG
• Flexible vinyl, semi-flexible vinyl, polyethylene, cross-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.
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