Keithley 2700, User Manual, Page: 114 / 500

Model 2700 Multimeter/Switch System User’s Manual Basic DMM Operation 3-23
Cable leakage
For high resistance measurements in a high humidity environment, use Teflon™ insulated
cables to minimize errors due to cable leakage.
Standard resistance measurements
NOTE Make sure the INPUTS switch is in the correct position. To use front panel
inputs, it must be in the “F” (out) position. For switching modules, it must be in
the “R” (in) position.
Perform the following steps to measure resistance:
1. If a switching channel is presently closed (displayed), press OPEN to open it.
2. Select the ohms measurement function by pressing
Ω
2 or
Ω
4.
3. Use the RANGE
Δ
and
∇
keys to select a measurement range consistent with the
expected resistance, or press AUTO to select autoranging (AUTO annunciator
turns on). Details on range are provided in
Section 4 .
4. Connect the resistance(s) to be measured.
CAUTION Front panel inputs — Do not apply more than 1000V peak between
INPUT HI and LO, or instrument damage may occur.
Model 7700 switching module — Do not apply more than 300V DC or
300V RMS (425V peak) for AC waveforms between input high (H) or
input low (L), or switching module damage may occur.
5. If using a switching module, perform the following steps to close the desired
channel. Keep in mind, that for
Ω
4 measurements, you will close the primary
(INPUT) channel (1 through 10). The paired channel will close automatically.
a. Press the CLOSE key.
b. Use , ,
Δ
, and
∇
to key in the channel number and press ENTER. The
previously closed channel(s) (if any) will open, and the specified channel (or
channel pair) will close.
NOTE While in the normal measurement state, you can use the and keys to close
channels. In general, each key press will open the presently closed channel, and
then close the next higher or lower channel.
6. Observe the displayed reading. If the “OVERFLOW” message is displayed, select
a higher range until a normal reading is displayed (or press AUTO for
autoranging). For manual ranging, use the lowest possible range for the best
resolution.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press OPEN if there is a channel closed.