Figure 4-3 Tout And Search Time - Keithley 2302 Instruction Manual

4-16 Long Integration Measurements
Figure 4-3
TOUT and search time
NOTE
Table 4-3
FAST, SEARch, and DETect command reference
FAST SEARch DETect
ON ON ON
ON ON OFF
ON OFF ON
ON OFF OFF
Shaded cells designate command with precedence in each mode.
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TOUT
A
Search Time
Long Integration
Time
• If a pulse is not present, timeout needs to elapse (TOUT).
• If DETECT ON (only), search time needs to elapse before responding to a bus
command (reading time not incurred).
• If SEARCH OFF or FAST ON, search time and reading time not incurred.
• Search time needs to elapse when checking TLEV command for valid setting.
The unit is most responsive to bus commands in this mode. The supply does not wait
for TOUT or search time plus reading time for background readings and TLEV com-
mand checks. Refer to Figure 4-3
"LONG INT".
With FAST set to ON, no background long integration measurements occur, no pulse
detection between user-triggered readings occur, no checking for the parameter of LINT
TLEV commands to detect a pulse occur, no setting of the pulse trigger timeout bits in
the status model between user-triggered readings occur.
For triggered readings to set the PTT (Pulse Trigger Timeout) bits in the status model,
set TEDGe to be RISING or FALLING. If TEDGe is set to NEITHER, the PTT will not
be set after the initial setting of FAST to ON and TEDGe to NEITHER. The setting of
NEITHER specifies no pulse edge for synchronization or detection. The bit is latched
until read so the bit may still be set in the status model from a previous timeout. (See
section 7 on the status model for more information.)
B
Reading
Time
Description
. Front panel displays "FAST LINT" instead of