Keithley 2302 Instruction Manual page 89

For the active steps, the trigger level may be set to a value appropriate for each rising or falling
step, or set to the same value for all active steps. If using the same values for all TLEVx steps,
make sure the TLEV value set is appropriate for the smallest step (in
could not be greater than 275mA). See
Table 3-5
Sample TLEV values for
TLEVx
TELV1
TELV2
TELV3
TELV4
TELV5
TELV6
Use the one-shot method for measuring the pulses since this pulse sequence rises and falls
between steps. To accomplish this, configure the Model 2306 for measuring the pulse sequence
then generate the pulse sequence. (See the programming example
page 3-33).
Pulse sequences — down steps first
Consider the pulse form in
three UP steps but does not rise or fall between the steps.
Figure 3-9
Pulse form with down steps first (600μsec step duration)
900mA
TLEV1
750mA
600mA
To measure the up step values in this pulse sequence, set the value for UP steps to equal the
sum of actual UP steps plus one while setting the DOWN step value to zero. In
UP steps are set to 4 and DOWN steps to 0. (If UP steps are set to a non-zero value, the
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Table 3-5
Figure 3-8
Unique TLEVx value
550mA
325mA
200mA
300mA
500mA
800mA
Figure 3-9. This pulse form has three DOWN steps followed by
700mA
TLEV4
625mA
575mA
TLEV3
500mA
450mA
TLEV2
300mA
400mA
100mA
Pulse Current Measurements
Figure 3-8, the TLEV value
for sample trigger level values.
Same TLEVx value
200mA
200mA
200mA
200mA
200mA
200mA
"One-shot pulse"
3-27
on
Figure 3-9, the