Front- Or Rear-Panel Test Connections - Keithley 2461 Reference Manual

Section 2: General operation
Keithley Instruments connector CS-1616-3, supplied with the Model 2461, can be used to make the
interlock connection to the rear panel. You must supply connection wire.
To ensure proper interlock operation, the external interlock switch and connection wires must be less
than 10 Ω when the switch is closed.
The pin locations and connections are shown in the following figure. The pins are:
•
Pin 3: Earth and chassis ground
•
Pin 2: Interlock
•
Pin 1: +6 V DC out (current limited)

Front- or rear-panel test connections

You can use either the front-panel or the rear-panel terminals to make connections to the device
under test (DUT). The instrument must be set to use either the front or the rear terminals.
You cannot make some connections to the front-panel terminals and some to the rear-panel
terminals for the same test setup. All connections for the same test must be made to either the front-
panel or the rear-panel terminals.
Be aware that hazardous voltages can appear on the LO terminals even if the terminals are
not presently selected. The TERMINALS FRONT/REAR switch selects the active terminals
for the measurement. It does not disconnect the terminals.
Determining whether to use front or rear terminals
The terminals on the front panel are banana jack connectors, and the rear-panel terminal is a screw-
terminal connector. Depending on your test setup, the test environment, and the precision of your
measurements, you may see different results between measurements taken from the front and rear
terminals.
For the most precise measurements, use the rear-panel screw terminal. You must also use the rear
panel connections when making bipolar junction transistor (BJT) measurements.
You may also want to use the rear-panel terminals if the test environment is electrically noisy.
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Model 2461 Interactive SourceMeter® Instrument Reference Manual
Figure 58: Model 2461 interlock pins
2461-901-01 A/November 2015