User manual

Front Panel Operation
3-36 2001-900-01 Rev. K/ August 2010
6. Observe the display. If the “Overflow” message is
shown, select a higher range until a normal reading is
displayed. Always use the lowest possible range for the
best resolution.
7. Take a reading from the display.
4-wire resistance measurements
The Model 2001 can make 4-wire resistance measurements
between 1µ and 210k. Assuming “bench reset”
conditions (see paragraph 3.12.1), the basic procedure is as
follows:
1. Connect test leads to the INPUT HI and LO and SENSE
4 WIRE HI and LO terminals of the Model 2001. Rec-
ommended 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 4 function.
3. Select a range consistent with the expected resistance.
For automatic range selection, press the AUTO key. The
AUTO annunciator denotes whether auto-ranging is en-
abled.
4. Enable offset compensation if needed (refer to the pro-
cedure later in this paragraph).
If offset compensation is not being used,
the 20 and 200 ranges require zero
correction in order to achieve the best
accuracy. The zero correction procedure is
located in a following paragraph.
5. Connect the test leads to the resistance as shown in
Figure 3-15.
6. Observe the display. If the “Overflow” message is
shown, select a higher range until a normal reading is
displayed. Always use the lowest possible range for the
best resolution.
7. Take a reading from the display.
Zeroing
The term “when properly zeroed” means that you must
establish a baseline for subsequent measurements on that
range. The 20 and 200 resistance ranges require zero
correction to correct for thermal offsets. This procedure
should be performed whenever the ambient temperature
changes. To zero (rel) the Model 2001, use the following
procedure:
1. Disable rel, if presently enabled, by pressing the REL
key. The REL annunciator will turn off.
2. Select the desired function (2 or 4) and range.
3. Connect the test leads to INPUT HI and LO (and
SENSE 4 WIRE if the 4 function is selected) of the
Model 2001 and short them together. Noise and thermal
offsets may require a few moments to stabilize.
4. Press the REL key. The display will read zero.
5. Remove the short and connect the test leads to the resis-
tance to be measured.
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Two-wire resistance measurements
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RANGE
AUTO
FILTER MATH
RANGE
2001 MULTIMETER
SENSE
Ω 4 WIRE
HI
INPUT
LO
INPUTS
CAL
500V
PEAK
F
R
FRONT/REAR
2A 250V
AMPS
350V
PEAK
1100V
PEAK
Model 2001
Resistance
Under Test
Shielded
Cable
Optional shield
+00.00100 Ω
Range: 20Ω
Note: Source current flows from the
INPUT HI to INPUT LO terminals.