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4-4 Long Integration Measurements

Pulse timeout

PULSE TIMEOUT applies only to long integration measurements that are conﬁgured to be

triggered by rising or falling pulse edges. After the long integration function is selected, the

instrument searches for a pulse. If a pulse is not detected within the speciﬁed time (pulse time-

out), the “NO PULSE” message will be displayed. While the “NO PULSE” message is dis-

played, the instrument continues to search for a pulse. With a long timeout setting, the

instrument may appear locked up while it is searching for the pulse to start the long integration.

PULSE TIMEOUT can be set from 1.000 to 63.000 seconds.

NOTE For GPIB operation, the search after the timeout can be disabled (see the :SEARch

command in Table 4-1).

With neither trigger edge selected, pulse timeout is not used and a pulse search is not con-

ducted. Therefore, the “NO PULSE” message is never displayed. Measurements start as soon as

the long integration function is selected, even if no pulse is present. It is the responsibility of the

user to determine if a pulse was present when the measurement was made.

NOTE For GPIB operation, there is a fast readings mode that can be used with long integra-

tion functionality (see the :FAST command in Table 4-1).

Measurement conﬁguration

NOTE Current range is selected from the CURRENT RANGE item of the menu. Integration

time, trigger edge, trigger level and pulse timeout are set from the LONG INTEGRA-

TION item of the menu. Details on integration time, trigger edge, trigger level, and

pulse timeout are provided in the “Overview”.

Table 1-2 (in Section 1) shows the menu structure. Rules to navigate the menu follow

the table.

Current range

For long integration measurements, the AUTO range selection is functionally a no-op (no oper-

ation). The instrument will not autorange with the long integration measurement function selected.

For Models 2303 and 2303B, long integration measurements are performed on the 5A range,

regardless of the range selection.

For Model 2303-PJ, long integration measurements are performed on which ever range the

instrument is on when the long integration measurement function is selected.

Current range is linked to current limit. Therefore, as a general rule, the user selects the cur-

rent range before setting the current limit. See “Outputting voltage and current” (in Section 2)

for details on current range and current limit. Current range is selected from CURRENT

RANGE item of the menu.

Keithley 2303 User Manual

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