Keithley 6430 Instruction Manual page 133

Sub-femtoamp remote sourcemeter

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The guard test lead IR drop is compensated for by connecting GUARD SENSE as shown in

Figure 5-14B. Sensing allows the guard voltage to be sensed (measured) at the resistor network

for better guard voltage regulation. If the remotely sensed guard voltage is less than the output

voltage of the SourceMeter, the guard voltage will be increased until the sensed guard voltage

equals the output HI voltage.

Note that in order to ensure that ohms guard current (I

50mA, output voltage from the SourceMeter must not exceed 5V (50mA × 100Ω = 5V).

In-circuit ohms

measurements

using guard sense

A. Local Guard Sense

B. Remote Guard Sense

For 6-wire ohms guard measurements, conﬁgure the output-off state to the GUARD

mode. For details on the GUARD output-off state, see Section 12, "Output

conﬁguration."

I-Source V-Meter

Ohms Guard Selected

I-Source V-Meter

Ohms Guard Selected

(Ohms Guard)

Guard (Cable)

(Ohms Guard)

Guard (Cable)

Source-Measure Concepts

) in Figure 5-14 does not exceed

Test Lead Resistance

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