Campbell CM3, Instruction Manual, Page: 8 / 16

CM3 Pyranometer
4
FIGURE 3-3. 025 Crossarm Stand and 019ALU Crossarm
FIGURE 3-4. UTKZ Leveling Fixture and Crossarm Mount and
UT018 Tower Mounting Bracket and Crossarm
4. Wiring
Use Differential Voltage measurement instruction 2 to measure the CM3. The
CM3 wiring diagram is shown in Figure 4-1.
The red lead is connected to the high side (H) of any differential channel. The
blue lead is connected to the corresponding low (L) side of the differential
channel. On a CR10(X) or CR510, the white lead is connected to an analog
ground (AG) and the clear to ground (G). On the CR23X, 21X or CR7 both the
white and clear leads are connected to ground (
).
While a differential measurement is better and preferred, the CM3 can be
measured on a single-ended channel using Instruction 1 if the power induced
voltages discussed in the following paragraph are prevented.
025STAND
Crossarm Stand
019ALU Crossarm
CM3
UT018 Crossarm
UT018 Tower
Mounting Bracket
Tower Support
UTKZ Leveling
Fixture and
Crossarm Mount
(includes CM3MT)
3/4” x 3/4”
NU-RAIL 3/4” x 1”
NU-RAIL
3/4” x 3/4”
NU-RAIL