User’s Manual UT5583 Insulation Resistance Tester
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13
TRIG
Test trigger input terminal
Edge signal, trigger edge tyoe can select in <Setup> page, the default
is falling edge.
Low level maintains 1ms.
Table 12-3 Pin Definition of Voltage Terminal in Single Comparison Mode
Pin
Name
Description
19
ISO-COM
Common ground, not allow to float.
Be sure to be reliably connected to the ground (COM) port of the power
supply of an external controller (such as a PLC).
20
21
24
Internal
ISO-VCC
Output
Positive output of internal VCC power supply
Internal isolation power voltage: 5V, 0.2A, 1Wmax
Do not connect if it is not necessary.
25
1. Pin P24/P25 is output terminal of internal isolation power.
2. Warning: Set pin P24/P25 to be floating when normal connecting to PLC.
3. Internal power voltage is limited (5V
，
0.2A, 1Wmax), it cannot drive the power
relay or high power LED.
4. Pin P24/P25 has built-in automatic self-recovery fuse, it will cut off the
connecting of ISO-VCC when it excceds 0.5 A, long short circuit will cause the
fuse to burn out.
12.2.2 Time Sequence of Single Comparison Mode
Figure 12-1 Time Squence of Start/Stop in Single Comparative Mode
