Hioki LR8402-20 - Page 96

4.1 Confirming Measured Values, and Starting Measurement
84
• This table shows the maximum applied voltage ratings for the analog
input units and the HiLogger's external control I/O terminals, between
grounds, and between channels. To avoid electric shock accidents
and damage to the HiLogger, do not exceed these voltages.
• Channels are insulated by semiconductor relays.When a voltage
beyond the specification is applied between the channels, the semi-
conductor relay may short circuit. Please ensure that a voltage beyond
specification, especially a surge such as a lightning, is never applied.
When an abnormal measurement value is observed, please contact
your dealer or Hioki representative for inspection.
• Never apply voltage to the alarm ou
tput terminals. The HiLogger
will be damaged.
• The grounds for the EXT TRG and TRIG OUT terminals are common
with the HiLogger grounds (GND), and are not isolated. To avoid
damaging the HiLogger, connect wiring so as to avoid any potential
difference between the grounds of the EXT TRIG and TRIG OUT ter-
minals and connected devices (or system).
Input and Output
Terminals
Maximum
Input Voltage
Maximum rated
voltage to earth
Max. Inter-Channel
Voltage
Analog Input
Terminals
(both Voltage/
Temp Unit, and
Universal Unit)
±100 VDC 300 V AC,DC
Voltage/Temp Unit:
250 VDC
Universal Unit:
300 VDC,
however, RTDs are
not isolated between
channels
Pulse Input
Terminals
0 to 50 VDC
Non-Isolated
(HiLogger/GND
Common)
Non-Isolated (HiLog-
ger/GND Common)
Alarm Output
Terminals

Non-Isolated
(HiLogger/GND
Common)
Non-Isolated (HiLog-
ger/GND Common)
External Trigger
(EXT.TRIG)
Terminal
0 to 10 VDC
Non-Isolated
(HiLogger/GND
Common)

Trigger Output
(TRIG.OUT)
Terminal
-20 to 30
VDC
Non-Isolated
(HiLogger/GND
Common)
