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5.6 Testing Using EXT I/O
______________________________________________________________________________________________
Meaning Timing (approximate)
T1
Minimum time period for trigger signal recognition
100 μs
T2
Time period from trigger to circuit response
300 μs+α
(α depends on the sample
under test and the trigger delay)
T3
Analog measurement time; chucking switching on
INDEX (HIGH) possible
(Note 1)
1 ms (Note 2)
T4
Time period for testing
5 ms (Note 2)
T5
Minimum time period from end of testing to next
trigger
0s
T6
Time period from trigger input to panel load signal
recognition. After this length of time has elapsed, the
LD signal can be changed.
300 μs
T7
From Comparator judgement result output to EOM
(LOW): Setting value for Delay Time.
10 μs (Note 3)
NOTE
Note1: The chuck can be switched using the INDEX
―――――
signal only when the test
signal level, current and voltage limits, test range, and average are set as
specified below:
Test signal level: Open circuit voltage (V) setting
Current and voltage limits: OFF
Test range: HOLD range
Average: OFF
Note2: Reference value with the following conditions; test frequency:1 kHz, testing
speed:FAST, averaging:OFF, and when measuring |Z|.
For the test time, refer to Section 7.3, "Time Taken for Testing."
Note3: There is an approximate error of 40 μs in the display time entered for
Judgement Result EOM
―――――
for the setting value. When the setting value is
0.0 s, the display time is approximately 10 μs
When the selected panel number is not stored, the 3532-50 begins
measurement without loading the measurement conditions.
When the measurement conditions are loaded, the external trigger is always
set.
The rise time speed of signal line for comparator judgement result output
(Pins 16 to 22) depends on the circuit structure connected to the EXT I/O.
Because of this, the comparator judgement result level immediately
after EOM
―――――
output may cause measurement error. To prevent this, it is
possible to set the command of delay time between comparator judgement
result output and EOM
―――――
. In addition, when the Command setting for
judgement result signal line in EXT I/O (:IO:RESult:RESet) is enabled (ON)
and forcibly moved to HIGH level simultaneously with TRIG
―――――
,LOW HIGH
transfer will not occur when evaluation result is outputted immediately after
measurement has finished. As a result, the delay time between the judgement
result output and EOM
―――――
can be minimized. However, take note that the
evaluation result confirmation range is valid until the following triggers are
accepted.
During measurement, a trigger input from EXT /IO or communicating by
interface may lead to a bigger dispersion of delay time between comparator
judgement result output and EOM
―――――
. As far as possible, try not to control from
external sources when carrying out measurement.
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