Tlev Steps - Keithley 2308 User Manual

Model 2308 Portable Device Battery/Charger Simulator User's Manual
integration time and current range apply to all steps in the measurement sequence. Timeout has
two settings - one for the first step and one for the remaining steps in the sequence. Use an array
command to trigger this method since an array of values are returned (e.g.,

TLEV steps

TLEV (trigger level) steps are used to define the pulse sequence. A maximum of 20 steps may be
defined. These steps can be all UP steps, all DOWN steps, or a combination with the summation
of UP and DOWN steps to measure not exceeding 20 (see
measured before DOWN steps. To use the step method on pulse forms with DOWN steps first,
special programming considerations can be taken. Refer to
NOTE
When using the pulse current step method, select the current range first, then set the trigger level
step values. Select the most accurate current range suitable for the highest trigger level step
value. Current range needs to be specified before step values because the step values max
setting is based on selected current range. Also, only one current range is used during the step
operation. You may change current ranges; the step values will be verified against the new current
range (see
Active steps refer to valid UP steps plus valid DOWN steps. If pulse current step method is
selected when a trigger command is received, the number of measurements taken equals the
number of active steps. Therefore, to receive all measurements at once, use array commands. If
array commands are not used, then a single reading is returned. This single reading represents
the average of the active step measurements.
NOTE
2308-900-01 Rev. A / July 2008
Do not change the current range after the trigger level ranges are selected.
Erroneous readings may result. Erroneous readings will occur if the existing
trigger level settings are out of range for the new current range, or if the trigger
level settings are unable to detect the pulse on the new current range.
Changing ranges
Table 3-5
Setting UP and DOWN commands
Command
:SENS:PCUR:STEP:UP 1
:SENS:PCUR:STEP:UP 20
:SENS:PCUR:STEP:DOWN 3
:SENS:PCUR:STEP:UP 12
:SENS:PCUR:STEP:DOWN 10 12 (UP) + 10 (DOWN) > 20 ∴
If there are zero (0) active steps when a trigger command for step is received
(number of steps UP + the number of steps DOWN = 0), one reading will be
returned (an overflow).
Return to
for more detail).
Description
1 (UP) + 1 (DOWN default)
20 (UP) + 1 (DOWN) > 20 ∴
error message (-222, parameter out of range). Both the up
and down settings stay at 1.
3 (DOWN) + 1 (UP)
12 (UP) + 3 (DOWN)
error message (-222, parameter out of range). The down
setting stays at 3.
Section Topics
Section 3: Pulse Current Measurements
:READ[1]:ARRay?
Table 3-5). UP steps are always
Pulse sequences - down steps
≤
20 ∴
this command is ok.
this command generates an
≤
20 ∴
this command is ok.
≤
20 ∴
this command is ok.
this command generates an
).
first.
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