Keithley 2308, Quick Start Manual, Page: 30 / 40

Front-panel operation 23
Charger channel (#2): Set the trigger level from 0 to 5 A in 5 mA steps for the 5 A
current range. Recall, you are only able to perform pulse current readings on 5 A
current range for charger channel.
If the trigger level is incorrect or the DUT is not functioning properly, the message
LONG INT TRIG NOT DETECTED will be displayed (see the LONG INT TRIG
NOT DETECTED note on
page 24 ).
Trigger edge – TRIGGER EDGE submenu
Toggle between the RISING, FALLING, and NEITHER settings with the
▲
or
▼
keys. With NEITHER selected, measurements will start as soon as the long
integration function is selected.
Timeout – TIMEOUT submenu
When the TIMEOUT value is reached, NO PULSE is displayed (top line of the front-
panel display). The value for TIMEOUT should be set to a value greater than the
long integration time for a long integration reading. This is true when the integration
time represents a single pulse period. However, when the integration time is used
to average multiple pulses then, set the TIMEOUT value to a value greater than a
single pulse period. The default setting is 16 ms.
Manually setting long integration time (INTEGRATION TIME submenu)
The value for LINT INT TIME for Channel #1 or Channel #2 can be specified in
0.850
sec to 60 sec (i.e. @ 60Hz) with the
▲
,
▼
, ,
or keys.
Automatically setting long integration time (AUTO TIME submenu)
Press ENTER when LINT AUTOTIME #1, #2, ACQUIRE TIMES appears on the
display. If the correct trigger level is selected in the previous step and the DUT is
operating, the Model 2308 will automatically determine the INTEGRATION times.
If the trigger level is incorrect or the DUT is not functioning properly, the message
LONG INT TRIG NOT DETECTED will be displayed. (See the LONG INT TRIG
NOT DETECTED note on
page 24 .)
Long integration display mode
Long integration measurements are displayed with the long integration display
mode selected.
NOTE
To display measured readings if the instrument is in the settings
mode, press the
SET key until the blinking stops (the measured
readings can then be displayed). To determine if the instrument
is in the settings mode, check for a blinking cursor in a digit of
the voltage or current field (if present, the instrument is in the
setting mode).
▲
▲