0B System SourceMeter® Instrument Reference Manual Section 4:
2600BS-901-01 Rev. C / August 2016 4-27
For controlling settling time delay
The following code provides measure delay examples for controlling settling time delay of SMU
Channel A:
-- To turn off measure delay (default setting is smua.DELAY_AUTO).
smua.measure.delay = 0
-- set measure delay for all ranges to Y (in seconds).
smua.measure.delay = Y
-- To adjust the delay factor.
smua.measure.delayfactor = 1.0
The delay factor is used to multiply the default delays. Setting this value above 1.0 increases the
delays; a value below 1.0 decreases the delay. Setting this value to 0.0 essentially turns off
measurement delays. This attribute is only used when smuX.measure.delay is set to
smuX.DELAY_AUTO.
For analog filter (Models 2634B/2635B/2636B only)
The following code provides measure delay examples for controlling the analog filter of SMU Channel
A:
-- Default.
smua.measure.analogfilter = 1
This filter is only active when the amps measure range is 1 nA/100 pA. Setting the attribute to zero (0)
disables the filter.
Effects of load on current source settling time
The settling time of the source-measure unit (SMU) can be influenced by the impedance of the device
under test (DUT) in several ways. One influence is caused by an interaction between the impedances
of the SMU current source feedback element and the DUT. This interaction can cause a reduction in
the bandwidth of the SMU. This reduction causes an increase in the settling time of the current
source.
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