Keithley 2000, Руководство пользователя, Страница: 42 / 280

Measuring resistance
The Model 2000 can make 2-wire and 4-wire resistance measurements from 100µ
Ω
to
120M
Ω
.
Connections
Assuming factory default conditions, the basic procedure is as follows:
1. Connect test leads to the Model 2000 as follows:
A.
For
Ω
2-wire, connect the test leads to INPUT HI and LO.
B. For
Ω
4-wire, connect the test leads to INPUT HI and LO, and SENSE
Ω
4 WIRE
HI and LO. Recommended Kelvin test probes include the Keithley Models 5805
and 5806. Either the front or rear inputs can be used; place the INPUTS button in
the appropriate position.
2. Select the measurement function by pressing
Ω
2 or
Ω
4.
3. Pressing AUTO toggles autoranging. Notice the AUTO annunciator is displayed with
autoranging. If you want manual ranging, use the RANGE
▲
and
▼
keys to select a
measurement range consistent with the expected resistance.
4. Connect test leads to the resistance as shown in Figure 2-6.
CAUTION Do not apply more than 1000V peak between INPUT HI and LO or instru-
ment damage may occur.
5. Observe the display. If the “OVERFLOW” message is displayed, select a higher range
until a normal reading is displayed. Use the lowest possible range for the best resolution.
6. Take a reading from the display.
2-24 Basic Measurements