Hioki RM3542, Инструкция по эксплуатации, Страница: 93 / 218

8.1 External Input/Output Connector and Signals
87
8
Input Signals
Output Signals
• Input signals are ignored when the following are displayed: Basic, Detailed, and Comparator Settings
screens; Statistical Calculation Results screen (except for the print signal); and error messages (except
Setting Monitor errors).
• EXT I/O input and output signals are not usable while changing measurement settings.
Signal Descriptions
TRIG
When external triggering (EXT) is enabled, one measurement is performed at the falling (ON)
or rising (OFF) edge of the TRIG signal. Falling (ON) or rising (OFF) edge triggering can be
selected on the Settings screen (default: falling (ON) edge).
When internal triggering (INT) is enabled, external triggering is disabled. Also, when the Set-
tings Monitor function is enabled and an error occurs, triggering is disabled (p. 53).
The TRIG signal performs the following operations in addition external triggering:
•
Stores statistical calculation data (when statistical calculation is enabled)
•
Stores measured data to internal memory (when the data memory function is enabled)
(also operates with internal triggering)
(p. 94)
0ADJ
Asserting the 0ADJ signal executes zero adjustment once.
To avoid malfunction, this signal should be asserted (Low) for at least 10 ms.
(p. 32)
PRINT Asserting the PRINT signal prints the current measurement value.
(p. 82)
CAL
Asserting the CAL signal executes self calibration. The time required for self calibration is as
follows:
Approximately 130 ms (with 60-Hz line frequency setting), or 110 ms (with 50-Hz setting)
If asserted during measurement, executes after the end of measurement.
(p. 57)
HOLD
Holding the HOLD signal low enables external triggering. When the HOLD signal is high, the
settings made on the Settings screen or by commands are re-enabled.
PRB_CHECK
Asserting the PRB_CHECK signal executes probe short-circuit adjustment one time. If
asserted during measurement, executes after the specified time from the end of measurement.
(p. 51)
KEY_LOCK
While the KEY_LOCK signal is held low, all front panel keys (except POWER button) are dis-
abled (key unlock and remote control cancellation operations are also disabled).
(p. 59)
ERR
This signal indicates that a measurement fault has occurred (except out-of-range detection). It
is updated simultaneously with the EOM signal. At this time, comparator decision outputs are
all de-asserted (high).
(p. 38)
CE_HI
This signal indicates that a contact check error has occurred between H
CUR
and H
POT
con-
tacts. It is updated simultaneously with the EOM signal. At this time, comparator decision out-
puts are all de-asserted (high).
(p. 46)
CE_LO
This signal indicates that a contact check error has occurred between L
CUR
and L
POT
con-
tacts. It is updated simultaneously with the EOM signal. At this time, comparator decision out-
puts are all de-asserted (high).
(p. 46)
PRB_SHORT
This signal indicates that a foreign object is shorting the POT and CUR contacts in a four-ter-
minal probe tip. At this time, comparator decision outputs are all de-asserted (high).
(p. 51)
INDEX
This signal indicates that A/D conversion in the measurement circuit is finished.
When the asserted (low) state occurs, the measurement sample can be removed.
EOM
This signal indicates the end of a measurement. At this time, the states of the comparator deci-
sion outputs and ERR, CE_HI, CE_LO, and PRB_SHORT are all determined.
(p. 93)
HI, IN, LO
These are the comparator decision output signals.