Keithley 2302 Instruction Manual page 86

3-24 Pulse Current Measurements
verified for being valid on the new range (discussed in more detail later in this section). Because
the Models 2306 and 2306-VS have one current range (5A), this range is always the order of
operation.
Table 3-4
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
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
The step method can be used on a variety of pulse forms. See
can be measured either as one-shot pulse or as a continuous pulse train. For other pulse forms
that can be measured as one-shot only pulses, see
rise and fall between steps, use the one-shot method to measure the step values (see
sequences — rising and falling" on page
trains, the first step may trigger on any step that would be appropriate for that trigger level. For
example, a first step trigger level of 200 milliamps may trigger on any step with an expected
value greater that 200 milliamps.
that any one of the six steps may actually trigger as a first step reading. Hence, the array of step
readings may have overflow readings and/or expected step values out of sequence. In addition,
this would vary between triggered step measurements.
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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).
Figure 3-8
Description
1 (UP) + 1 (DOWN default)
ok.
20 (UP) + 1 (DOWN) > 20 ∴ this command generates
an error message (-222, parameter out of range). Both
the up and down settings stay at 1.
≤ 20 ∴ this command is ok.
3 (DOWN) + 1 (UP)
≤ 20 ∴ this command is ok.
12 (UP) + 3 (DOWN)
12 (UP) + 10 (DOWN) > 20 ∴ this command gener-
ates an error message (-222, parameter out of range).
The down setting stays at 3.
Figure 3-5
Figure 3-6. For pulse trains that have steps that
3-26). If the continuous method is used on these pulse
shows that with a first step TLEV of 200 milliamps
≤ 20 ∴ this command is
for pulse forms that
"Pulse