Keithley 2182 User Manual page 100

5-10 Ratio and Delta
When a growing-amplitude current is required, the custom sweep can be configured to
include all the current values required for the test. For example, assume the test requires two
Delta measurements at each of three current levels; 1mA, 2mA, and 5mA. That test would
require the following 12-point custom sweep to produce the six Delta measurements:
P0000 = +1mA
P0002 = +1mA
P0004 = +2mA
P0006 = +2mA
P0008 = +5mA
P0010 = +5mA
The following procedure uses the SourceMeter as a bipolar fixed-amplitude current source.
It outputs a 2-point custom sweep to provide current reversal that is required for Delta
measurements by the Model 2182.
NOTES
Step 1
Connect the SourceMeter and Model 2182 to the DUT as shown in
a trigger link cable (Model 8501) from the Model 2182 to the SourceMeter.
NOTE
Step 2
BENCH defaults are restored from the Main Menu, which is accessed by pressing MENU:
MAIN MENU → SAVESETUP → GLOBAL → RESET → BENCH
P0001 = –1mA
P0003 = –1mA
P0005 = –2mA
P0007 = –2mA
P0009 = –5mA
P0011 = –5mA
• When using the Model 2182 to perform Delta measurements, RATE must be
set to 1 PLC or 5 PLC to optimize measurement performance. At 1 PLC or 5
PLC, Delta measurements will cancel thermal EMFs to a <50nV level.
• The SourceMeter SPEED must be set to FAST (0.01 PLC). Using a slower
speed will result in trigger synchronization problems with the Model 2182.
• The following procedure assumes SourceMeter firmware version C11 or later.
Connect the Delta measurement test circuit.
This procedure assumes that the Model 2182 is using the factory default Trigger Link
line configuration; Line 1 is VMC (output), Line 2 is EXT TRIG (input).
Return the SourceMeter to BENCH defaults.
Figure 5-3. Also connect