TESTO 6681 Instruction Manual page 28

testo 6681 Ethernet
28
Wiring diagram for 4-wire system
(0 to 20 mA/4 to 20 mA/0 to 1 V/0 to 5 V/0 to 10 V)
24V
-
+
20 to 30 V
AC/DC
+
-
0 V
1
channels through opened M 16 x 1.5 screw connection (item (8) in
Overview of terminals, chapter 1.3.3.1, page 26.
2
channel terminals as shown in diagram.
3 Close M 16 x 1.5 screw connection (item (8) in Overview of
terminals, chapter 1.3.3.1, page 26.
- 1.3 Commissioning
CH1
CH2
- -
+ +
Requirement for the connecting cable of the supply:

Insulated with cross-section of at least 0.25 sq. mm.

The supply line must be secured against exceeding 8 A.

An OFF switch must be installed in an easily accessible
position close by and be marked as such.
Feed connection cables of the two, or optionally three,
Strip the cable ends, clamp wire end ferrules on and screw to
CH3
-
+
2 or 3 channels
0 to 20 mA/
4 to 20 mA/
max. load per 500 
0 to 1 V/0 to 5 V/0 to 10 V