Front-panel operation 21
Long integration mode
In the long integration mode, a current measurement results from a continuous
integration of the dynamic current for a period ranging from approximately 850 ms
to 60 sec set in 1msec increments. The Model 2308 can determine the integration
time automatically or the user can set the integration time manually from the front
panel. A pulse edge can be used to trigger the start of the measurement as shown
in
Figure 10
. Select RISING to use a rising pulse edge to start the measurement.
Select FALLING to use a falling pulse edge to start the measurement. A third option
is available if you do not want measurements controlled by pulse edges. With
NEITHER selected, measurements will start as soon as the long integration
function is selected. Note that a pulse has to be detected before a RISING or
FALLING pulse edge can trigger a long integration measurement (see
Set trigger
level on page 22
). To average over several pulse periods, the user must enter the
sum of the pulse periods as the integration time.
The GPIB commands TIMEOUT, SEARCH, DETECT, and FAST are available in
the long integration mode to optimize measurement speed. For the relevance and
use of these commands regarding a particular measurement application, refer to
the Model 2308 Instruction Manual, Section 4, Long Integration Measurements.
Figure 10
Pulsed waveform
Front-panel operation for performing long integration
measurements
All of the following settings are available in submenus of the
LONG INTEGRAT #1/
#2
main menu item. Scroll through the main menu until
LONG INTEGRAT #1/#2
is displayed, press
ENTER
to access the submenus.
NOTE
The pulse waveform contained in
Figure 10
shows trigger level
and the integration time used by the Model 2308 for long
integration measurements.
Trigger
level
Average current
Integration time
(trigger set to rising)
Integration time
(trigger set to falling)
