Programming – Campbell Scientific LI190SB LI-COR Quantum Sensor User Manual

Page 9

LI190SB Quantum Sensor

TABLE 4-1. Connections to Campbell Scientific Dataloggers

Color

Description

CR9000(X)
CR5000
CR3000
CR1000
CR800
CR850

CR510
CR500
CR10(X)

21X
CR7
CR23X

Red Signal

Differential
High

Black Signal

Reference

Differential
Low

Clear Shield

*Jumper to AG or

with user supplied wire.

FIGURE 4-1. LI190SB Schematic

If a 21X is used to measure the LI190SB and powers a 12 VDC
sensor, the current drawn by the 12 VDC sensor may cause a
difference in ground potential between the 21X ground terminals
and the reference ground point in the datalogger. This ground
potential results in an offset on single ended measurements. This
offset can be as large as ± 60 mV. Thus, single ended
measurements should be avoided. The offset does not, however,
affect differential measurements.

NOTE

5. Programming

This section is for users who write their own datalogger programs. A
datalogger program to measure the LI190SB can be created using the Short
Cut software. You do not need to read the following section to use Short Cut.