![background image](http://html2.mh-extra.com/html/keithley/2308/2308_user-manual_3948247078.webp)
3-24
Return to
Section Topics
2308-900-01 Rev. A / July 2008
Section 3: Pulse Current Measurements
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Use the one-shot method for measuring the pulses since this pulse sequence rises and falls
between steps. To accomplish this, configure the Model 2308 for measuring the pulse sequence
then generate the pulse sequence (See the programming example
One-shot pulse
).
Pulse sequences - down steps first
Consider the pulse form in
Figure 3-10
. This pulse form has three DOWN steps followed by three
UP steps but does not rise or fall between the steps.
Figure 3-10
Pulse form with down steps first (600
μ
sec step duration)
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
Figure 3-10
, the UP
steps are set to 4 and DOWN steps to 0 (If UP steps are set to a non-zero value, the Model 2308
measures them first). Also set TLEV1 for the initial step. This value needs to be appropriate for
detecting the first DOWN step as an UP step measurement (in
Figure 3-10
, this value is set at
750mA). For the UP steps, set the trigger level to a value appropriate for each rising step. The key
to detecting this pulse sequence is setting the step timeout to a value high enough to bypass the
remaining down steps after measuring the first step.
For
Figure 3-10
, the following expected measurement values and TLEV values were used:
Expected measurements:
UP
450 mA, 575 mA, and 700 mA (4th-6th pulses)
DOWN 900 mA, 600 mA, 300 mA (1st-3rd pulses)
TLEV6
800 mA
200 mA
Table 3-7
Sample TLEV values for
Figure 3-9
TLEV
x
Unique TLEV
x
value
Same TLEV
x
value
TLEV2
400mA
TLEV1
750mA
450mA
575mA
700mA
900mA
600mA
300mA
TLEV
3
500mA
TLEV4
625mA
100mA
Summary of Contents for 2308
Page 2: ......
Page 12: ...This page left blank intentionally...
Page 32: ...This page left blank intentionally...
Page 106: ...This page left blank intentionally...
Page 140: ...This page left blank intentionally...
Page 208: ...This page left blank intentionally...
Page 220: ...This page left blank intentionally...