Integration Time; Pulse Timeout; Trigger Edge And Trigger Level - Keithley 2303 User Manual

Integration time

Use the following items of the LONG INTEGRATION menu item to set the integration time:
Integration time
Manually set the long integration time. For 60Hz power line frequency, integration time can
be set from 850msec to 60 sec. For 50Hz power line frequency, integration time can be set from
840msec to 60 sec.
Auto time
Use to automatically set the integration time. When the AUTO TIME operation is performed,
the instrument measures the time between two rising pulse edges and sets an appropriate inte-
gration time that will encompass the high and low periods of a single pulse.

Pulse timeout

Use the following item of the LONG INTEGRATION menu item to set pulse timeout:
Pulse timeout
Set pulse timeout (from 1 to 63 seconds) for long integration measurements that are config-
ured to be triggered by rising or falling pulse edges. If a pulse is not detected within the specified
time (pulse timeout), the "NO PULSE" message will be displayed. While the "NO PULSE"
message is displayed, the instrument continues to search for a pulse.

Trigger edge and trigger level

Use the following items of the LONG INTEGRATION menu item to set trigger edge and
trigger level:
Trigger edge
A pulse edge can be used to trigger the start of the measurement. Select RISING to use a ris-
ing 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 "Trigger Level").
Trigger level
Before a rising or falling pulse edge can trigger the start of a long integration, the pulse must
first be detected. Trigger level specifies the minimum pulse level that will cause detection.
Models 2303 and 2303B – Set the trigger level from 0 to 5A in 5mA steps.
Models 2303-PJ – The trigger level can be set for either the 5A or 500mA range. For the 5A
range, the trigger level can be set from 0 to 5A in 5mA steps. For the 500mA range, the trigger
level can be set from 0 to 500mA in 0.5mA steps.
Long Integration Measurements 4-5