Section 3: Functions and features
2606B System SourceMeter® Instrument Reference Manual
3-64
2606B-901-01 Rev. B / May 2018
Command interface
Turning on high-capacitance mode has the following effects on the SMU* settings:
•
smu
X
.measure.autorangei
is set to
smu
X
.AUTORANGE_FOLLOW_LIMIT
and cannot be
changed.
•
Current ranges below 1
µ
A are not accessible.
•
If
smu
X
.source.limiti
is less than 1
µ
A, it is raised to 1
µ
A.
•
If
smu
X
.source.rangei
is less than 1
µ
A, it is raised to 1
µ
A.
•
If
smu
X
.source.lowrangei
is less than 1
µ
A, it is raised to 1
µ
A.
•
If
smu
X
.measure.lowrangei
is less than 1
µ
A, it is raised to 1
µ
A.
* smu
X
can be
smua
for SMU Channel A or
smub
for SMU Channel B
Measuring current
The following inputs are required to test leakage using the factory leakage script, as shown in the
script example below.
SMU:
Sets the 2606B source-measure unit to use
levelv:
Sets the output voltage level
limiti:
Sets the current limit for discharging or charging the capacitor
sourcedelay:
Solve the following equation to determine the amount of time before making a current
reading:
i
C
∆
v
∆
t
------
=
Where:
i
is the
limiti
setting (current limit)
measurei:
Sets the current measure range
measuredelay:
Defines the delay to wait after lowering the current limit before taking the measurement
Script example
Use the
smu
X
.source.highc
attribute to set and control the options for high capacitance mode.
The programming examples (and figure) below illustrate how to enable high-capacitance mode on
SMU A.
1. To enable high-capacitance mode, send:
-- Enables high-capacitance mode.
smua.source.highc = smua.ENABLE