Keithley 2182, User Manual, Page: 102 / 339

5-12 Ratio and Delta
Step 4 Set up the SourceMeter to source current and measure voltage.
A. On the SourceMeter, select Source I and Measure V.
B. Select an appropriate current source range. For example, if your current reversal
values are going to ±1mA, select the 1mA source range.
C. Press SPEED and select FAST. SourceMeter measurements are not used in this test,
but it must run as fast as possible to avoid synchronization problems with the
Model 2182.
Step 5 Configure the SourceMeter to perform a 2-point custom sweep.
A. The menu to configure a sweep is accessed by pressing CONFIG and then SWEEP.
From the menu, select TYPE and then select CUSTOM.
Set the #-POINTS to two, and set ADJUST-POINTS (P0000 and P0001) to the
positive and negative current source values. For example, if the test requires 1mA,
set P0000 to +1mA and set P0001 to –1mA.
B. Also from the sweep configuration menu, specify the number of 2-point sweeps to
perform:
Selecting INFINITE allows the SourceMeter to continuously source the current
reversal sweep. Select FINITE if you wish to perform a specific number of 2-point
sweeps.
Step 6 Return the Model 2182 to FACTory defaults.
Return the nanovoltmeter to its factory default conditions, by pressing RESTR and selecting
FACT.
Step 7 Configure the Model 2182 for Delta measurements.
A. Press RATE to select 1 PLC (MED annunciator on) or 5 PLC (SLOW annunciator
on).
B. Enable Delta measurements by pressing SHIFT and then V1-V2.
NOTE For fast Delta measurements (2x speed), disable Front Autozero (SHIFT >
CONFIG > FRONT AUTOZERO N).
C. Press EX TRIG to place the instrument in the external trigger mode. This will halt
measurements.
D. If a longer settling time is required before performing each measurement, set a
manual delay from the Model 2182. Press SHIFT and then DELAY to select and set
delay.
NOTE Do not set a delay on the SourceMeter, as this may adversely affect trigger
synchronization between the SourceMeter and the Model 2182.