23
※
Note: The rear terminal panel can also be used via the same procedures as the front
panel. (See Figure 3-5)
Figure 3-5
2.3 Resistance Measurements (2 & 4-wire)
The ranges for resistance measurement are 100 Ω, 1KΩ, 10kΩ, 100kΩ, 1MΩ, 10MΩ, and
100MΩ, with a sensitivity of 100 μΩ (on 100 Ω range.) There are two modes for
measuring the resistance: 2-wire mode as shown in
Figure 3-6
and 4-wire mode as
shown in
Figure 3-7
. With 4-wire mode, the test current is measured from the test
resistance through one pair of the test leads, and the test voltage across the resistance
under test is measured from another set of the test leads. As a result, the 4-wire mode
is more accurate for low resistance measurements. The trade off is the longer settling
time for 4-wire mode.
Figure 3-8
and
3-9
shows the input terminal connections on the rear panel for 2-wire
mode and 4-wire mode respectively.
How to measure resistance
①
Selects input signal connections on front or rear panel.
②
Connect the test leads to the terminals as shown in
Figure 3-6
(2-wire) or
Figure
3-7
(4-wire).
③
Set RESOLUTION (Refer to 3.1.3) or skip this step if default is to be used.
④
Press Ω2 button for 2-wire measurement or SHIFT +Ω4(Ω2) buttons for 4-wire
measurement.
⑤
Select the auto-range function by pressing AUTO button on the front panel or use
△
and
▽
buttons to select the desired range.
⑥
Connect test leads to your source signal and observe the reading shown on the
display. If the input signal is greater than the allowed range, an overflow message
“OVLD” will be displayed.
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