2400 Series SourceMeter
®
User’s Manual
Ohms Measurements
4-11
Ohms source readback
NOTE
For the Model 2430 Pulse Mode, ohms source readback cannot be enabled.
With ohms source readback enabled, the instrument measures the actual source value
instead of the programmed value used for ohms measurements and then uses that mea-
sured value for reading calculations. Normally, ohms source readback should be left
enabled for optimum ohms measurement accuracy because SourceMeter measurement
accuracy is better than source programming accuracy. (See specifications in
Appendix A
.)
However, disabling source readback will allow you to make valid ohms measurements
with the source in compliance. See
Section 6
, “
Source I measure I and source V measure
V
,” for more details.
Ohms source readback selection
Use the following procedure to enable or disable ohms source readback:
1.
Press CONFIG then
Ω
.
2.
Select SRC RDBK, then press ENTER.
3.
Select DISABLE or ENABLE as desired, then press ENTER.
4.
Press EXIT to return to normal display.
NOTE
Readings in the compliance field will be invalid with source readback disabled.
6-wire ohms measurements
The 6-wire ohms measurement configuration allows you to make accurate resistance mea-
surements on resistor networks and hybrid devices in cases where internal resistance con-
nection nodes are not accessible. The combination of 4-wire Kelvin connections and
guarded ohms features eliminates the effects of internal parallel resistances that could
degrade measurement accuracy and reduce measurement speed. The basic procedure for
setting up the SourceMeter for 6-wire ohms measurements is covered below.
NOTE
See
Figure 2-5C
for 6-wire ohms connections. See also
Section 2
, “
Ohms
guard
,” and
Section 6
, “
Guard
.”
1.
Press CONFIG then
Ω
to display the CONFIG OHMS menu.
2.
Select SENSE MODE, then press ENTER.
3.
Select 4-WIRE, then press ENTER.
4.
From the CONFIG OHMS menu, select GUARD, then press ENTER.
5.
Select OHMS, then press ENTER.
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Содержание SourceMeter 2400
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