
2600AS-901-01 Rev. B / September 2008
Return to
4-21
Series 2600A System SourceMeter® Instruments Reference Manual
Section 4: Source-Measure Concepts
current ranges and associated default delays. In addition, a 1Hz analog filter is used by default on
the 1nA and 100pA ranges.
NOTE Delays are on by default for Models 2635A/2636A. Delays are off by
default for Models 2601A/2602A/2611A/2612A but can be enabled.
Both the analog filter and the default delays can be manipulated for faster response times. The
analog filter may be turned off to yield faster settling times. The default delays may also be
controlled by using the delay factor multiplier. The default value for delay factor multiplier is 1.0,
but adjusting to other values will result in either a faster or slower response. For example,
increasing the delay factor to 1.3 will account for settling to 0.01% of the final value. The
commands to manipulate the delay factor and analog filter are shown below:
For controlling settling time delay
-- To turn off measure delay (default setting is smuX.DELAY_AUTO).
smuX.measure.delay = 0
-- set measure delay for all ranges to Y (in seconds).
smuX.measure.delay = Y
-- To adjust the delay factor.
smuX.measure.delayfactor = 1.0
This factor is used to multiply the default delays. Setting this value above 1.0 increases the delays,
while 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 (2635A/2636A only)
-- Default.
smuX.measure.analogfilter = 1
Table 4-4
Current Measure Settling Time
1, 2
Time required to reach 0.1% of final value after source level command is
processed on a fixed range.
Values below for V
out
= 2V unless otherwise noted
Current range
Settling time
1.5A to 1A
<120
μ
s (typical)(Rload>6
Ω)
100mA to 10mA
<80
μ
s (typical)
1mA
<100
μ
s (typical)
100
μ
A
<150
μ
s (typical)
10
μ
A
<500
μ
s (typical)
1
μ
A
<2.5ms (typical)
100nA
<15ms (typical)
10nA
<90ms (typical)
1nA
1
<360ms (typical)
100pA
3
<360ms (typical)
1.
Delay factor set to 1. Compliance equal to 100 mA.
2.
Time for measurement to settle after a Vstep.
3.
With default analog filter setting < 450ms.