Keithley 2302 User Manual

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 Description
:SENS:PCUR:STEP:UP 1 1 (UP) + 1 (DOWN default) ≤ 20 ∴ this command is
ok.
:SENS:PCUR:STEP:UP 20 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.
:SENS:PCUR:STEP:DOWN 3 3 (DOWN) + 1 (UP)
≤ 20 ∴ this command is ok.
:SENS:PCUR:STEP:UP 12 12 (UP) + 3 (DOWN)
≤ 20 ∴ this command is ok.
:SENS:PCUR:STEP:DOWN 10 12 (UP) + 10 (DOWN) > 20 ∴ this comma
nd gener-
ates an error message (-222, parameter out of range).
The
down setting stays at 3.
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 If ther
e 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).
The step method can be used on a variety of pulse forms. See Figure
3-5 for pulse forms that
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 Figure 3-6. For pulse trains that have steps that
rise and fall between steps, use the one-shot method to measure the step values (see “Pulse
sequences — rising and falling” on page 3-26). If the continuous method is used on these pulse
trains, the first step may trigger on any step that would be appropriate for that trigger level. For
e
xample, a first step trigger level of 200 milliamps may trigger on any step with an expected
value greater that 200 milliamps. Figure 3-8 shows that with a first step TLEV of 200 milliamps
that any one of the six steps may actually trigger as a first step reading. Hence, the array of step
readings ma
y have overflow readings and/or expected step values out of sequence. In addition,
this would vary between triggered step measurements.
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Keithley 2302 Specifications

General

Brand	Keithley
Model	2302
Category	Power Supply
Language	English