Resistance Measurements (2 & 4-Wire); Easurements (2 & 4- Wire ) - Picotest M3500A User Manual

3.3 Resistance Measurements (2 & 4-wire)
The ranges for resistance measurement are 100
1M , 10M , and 100M , with a sensitivity of 100 µ
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 show the input terminal connections on the rear
panel for 2-wire mode and 4-wire mode respectively.
How to measure resistance
Selects input signal connections on front or rear panel.
① ① ① ①
Connect the test leads to the terminals as shown in Figure 3-6
② ② ② ②
(2-wire) or Figure 3-7 (4-wire).
Set RESOLUTION (Refer to 4.1.3) or skip this step if default is to be
③ ③ ③ ③
used.
Press Ω2 button for 2-wire measurement or SHIFT + Ω2 buttons for
④ ④ ④ ④
4-wire measurement.
Select the auto-range function by pressing AUTO button on the front
⑤ ⑤ ⑤ ⑤
panel or use
△
Connect test leads to your source signal and observe the reading
⑥ ⑥ ⑥ ⑥
shown on the display. If the input signal is greater than the allowed
range, an overflow message "OVLD" will be displayed.
and buttons to select the desired range.
▽
38 38 38 38
, 1K , 10k , 100k ,
(on 100 range.)