Instruction manual

262 Chapter 12
Specifications and Supplemental Performance Characteristics
Basic Measurement Characteristics
Test condition for “Typical data”
The measurement time of 4287A is scattered to some extent by an overhead of the internal
operation system and other conditions, so it is difficult to define the specification of
handler interface timing. Thus, for your reference, we provide “typical” data on it in Table
13-1 by defining the following test condition.
Definition for “typical” data:
Median : Median value of running one minute of measurement data
Max. : Max. value of running one minute of measurement data
NOTE 1. The instrument’s operating system sometimes suffers interruptions during measurement,
and we sometimes observe an extremely large overhead in handler interface timings. The
table excludes such special cases, thus you can sometimes see timing over the max. value
data shown in the table. If you make a handshake using the READY_FOR_TRIGGER
signal of the handler interface, your test system can continue to work correctly regardless
of such an irregular measurement time drift.
Table 12-1 Value T1 through T (Typical)
Name
Test Condition Timing
Screen Setting Display Rdc
Meas.
Compa
rator
Min. Median Max
T1 Trigger pulse width - - - -
2 μs
- -
T2 Trigger response
time of
Ready_for_Trig
- - - - - 0.3ms 0.5ms
T3 Trigger response
time of INDEX and
EOM
- - - - - 0.4ms 0.6ms
T4
Meas. Time‘
*1
- - Off - - 5.7ms 5.9ms
- - On - - 7.5ms 7.7ms
T5
Meas. data
calculation time
- - - Off - 0.3ms 0.4ms
- - - On - 0.4ms 0.4ms
T6
Ready_for_Trig
setting time
1-point meas.
Ls-Q meas.
Off - - - 0.1ms 0.3ms
1-point meas.
Ls-Q meas.
On On On - 9.8ms 10.2ms
List Meas. 3-point
meas. Ls-Q meas.
On On On - 9.8ms 10.2ms
T7 Trigger wait time - - 0 - 0 -
*1.1-point measurement, Trigger delay=0, point delay=0