Keithley 2601B Reference Manual page 84

Section 2: General operation
SourceMeter
Source voltage using series SMUs
2-60
®
instrument configuration
Series 2600B System SourceMeter® Instrument Reference Manual
Guidelines
Maximum Pulsed Signal Levels for Series 2600B:
Model 2601B/2602B/2604B:
80 V with 1.35 A limit
Model 2611B/2612B/2614B/2634B/2635B/2636B:
400 V with 900 mA limit
SMU 1 configuration:
Output-off mode:
smuX.source.offmode = smuX.OUTPUT_NORMAL
Output-off function:
smuX.source.offfunc = smuX.OUTPUT_DCVOLTS
Normal output-off current limit:
smuX.source.offlimiti = 1e-3 (default)
Current compliance must be 10% higher than the current compliance
of SMU 2. Current compliance limit (maximum):
Model 2601B/2602B/2604B:
smuX.trigger.source.limiti = 1.5
Model 2611B/2612B/2614B/2634B/2635B/2636B:
smuX.trigger.source.limiti = 1
The polarity of SMU 1 is generally the opposite of the desired voltage
polarity across the device. In order to achieve a positive voltage
across the device, program SMU 1 to a negative voltage level. For
example, to output 80 V across the device, program SMU 1 to -40 V
and SMU 2 to +40 V. In order to achieve a negative voltage across the
device, program SMU 1 to a positive voltage level and SMU 2 to a
negative voltage level.
Source polarity changes incur a 100 µs penalty. The number 0 is
considered a positive value. For negative-going pulses with a 0 V bias
level, avoid the time penalty by programming a negative number very
near zero, for example, -1e-30 V.
SMU 2 configuration:
Output-off mode:
smuX.source.offmode = smuX.OUTPUT_NORMAL
Output-off function:
smuX.source.offfunc = smuX.OUTPUT_DCVOLTS
Normal output-off current limit (0.9 mA which is 10% less than the
SMU 1 smuX.source.offlimiti):
smuX.source.offlimiti = 0.9e-3
Current compliance must be 10% lower than the current compliance of
SMU 1.Therefore this SMU will control the maximum current through
the DUT. Current compliance limit (maximum):
Model 2601B/2602B/2604B:
smuX.trigger.source.limiti = 1.35
Model 2611B/2612B/2614B/2634B/2635B/2636B:
smuX.trigger.source.limiti = 0.9
2600BS-901-01 Rev. B / May 2013