Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 7: Theory of operation
2601B-PULSE-901-01A April 2020 7-27
You can manipulate both the analog filter and the default delays to produce faster response times.
Turn off the analog filter to yield faster settling times. Control the default delays by using the delay
factor multiplier. The default value for delay factor multiplier is 1.0, but adjusting it to other values
results in either a faster or slower response. For example, increasing the delay factor to 1.3 accounts
for settling to 0.01 percent of the final value. The commands to manipulate the delay factor and
analog filter are shown in the following programming example.
Programming example for controlling settling time delay
The following code provides measure delay examples for controlling settling time delay:
-- 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
-- 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 smua.measure.delay is set to
smua.DELAY_AUTO.
Effects of load on current source settling time
When the pulser is disabled, 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 results in an increase
in the settling time of the current source.
There is a maximum DUT impedance for each current source range for which the specified current
settling times are maintained. The following table lists the DUT impedances for each of these current
source ranges. For the latest specifications, go to tek.com/keithley. The settling time on a current
source range can increase significantly when measuring DUTs that have an impedance that is higher
than the maximum DUT impedance listed below.
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