Instruction Manual
3
Table 2. Control Port Compatibility
Datalogger Input
(Hz) Control
Port
Measurement
Type
CR1000
CR3000
400,000
C1,C2… C8
High Frequency
CR800 400,000
C1,C2,C3,C4 High
Frequency
CR5000 5,000,000
C7,C8
High
Frequency
CR23X 2,500 C5,C6,C7,C8 High
Frequency
CR200(X) 1,000
P_LL,P_SW,C1,C2
High
Frequency
CR10X 40
C6,C7,C8
Switch
Closure
Comparing Table 1 to Table 2 suggests that the CR10X may not be able to read
either type of anemometer in high wind situations. However, all other dataloggers
would be appropriate choices.
4. Wiring
Most sensors that have a low-level AC output will have three wires: signal,
reference, and drain. The signal wire should go to P1 – P4 on the LLAC4 and the
reference and drain wires to a
on the LLAC4. The LLAC4 also requires that
12 V be applied to its 12 V terminal and G. This power should come from the
datalogger or the datalogger’s power supply.
A low-level AC signal on P1 will be converted to a 0-5 V square wave on the D1
terminal. D1 can be wired to an appropriate datalogger control port that can make
high frequency measurements.
P1
P2
P3
FROM SENSOR
T
O
DA
T
ALOGGER
P4
12V
G
D
1
D
2
D
3
D
4
G
12V
G
Control Port
G
12V
G
D1
G
DATALOGGER
SIG +
REF
DRAIN
P1
SENSOR
LLAC4
Figure 2. LLAC to TTL
