UT3500 series
User Manual
49
9.1 Terminals and Signals
Table 9-1 Definition of Output Terminal Pin
Table 9-2 Definition of Input Terminal Pin
Pin
Name
Description
24
TRIG
The rising edge is valid.
Table 9-3 Definition of Power Terminal Pin
Pin
Name
Description
9
GND
External Power GND Terminal
10
o_VCC
Positive Terminal of Internal VCC Power Supply (5V, 500mA)
9.2 Connection Mode
The instrument has a built-in fully isolated power supply, and there is no need to provide a
positive terminal for the external power supply. Please connect the external power supply
to the following pins at the same time:
Pin 9: External Power GND
Pin 10: Floating
9.2.1 Use Internal Power Supply
Internal Power Supply: 5V, maximum 0.5A.
Use internal power supply:
10: VCC (5V)
9: GND
Pin
Name
Description
Table 9-1 Terminals
Output Terminal (All signals
are active low)