Hioki ST5540, Instruction Manual, Page: 255 / 326

9.3 Electrical Specifications
249
8
9
Chapte
r 9 Ext
ernal
Co
ntrol
Input signal specifications
(Names of applicable signals : START, STOP, LOAD0 to LOAD4, KEYLOCK)
Output signal specifications
(Names of applicable signals : TEST, MEAS, PASS, U-FAIL, L-FAIL, T-FAIL)
Maximum input voltage to EXT.DCV terminal : 24 VDC to EXT.COM terminal
Internal power supply output (between INT.DCV and INT.GND terminals)
The output signal is open collector output from the photocoupler.
Inside the instrument, the photocoupler is connected to the EXT.DCV terminal with a 1.0 k

pull-up
resistor.
When not using the EXT.DCV terminal
When a load is directly connected to the output terminal without using the EXT.DCV terminal, the fol-
lowing relationship should exist among the external DC power supply voltage (connected to the
other end of the load), output signal voltage, and current flowing to the output terminal.
9.3 Electrical Specifications
Input signal Active Low input
Maximum applied voltage Input voltage to EXT.DCV terminal
High level Input voltage to EXT.DCV terminal, or open
Low level 0.3 VDC or lower
Output signal Open collector output
Maximum load voltage 24 VDC (when not using EXT.DCV terminal)
Maximum output current 60 mA DC/1 signal (at Low level)
Output voltage 5 VDC
Maximum load current 100 mA DC
External DC
power supply
Output signal voltage
High level
Low level
10 mA
output current
40 mA
output current
60 mA output
current (max.)
5 V 5 V 0.9 V 1.1 V 1.2 V
12 V 12 V 0.9 V 1.1 V 1.2 V
24 V 24 V 0.9 V 1.1 V 1.2 V