4 and 8 cls scaling values – Watlow CLS User Manual

Page 43

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Installation

CLS User’s Guide 35

4 and 8 CLS Scaling Values

•

For RTD1 inputs, RA and RB are a matched pair (RP). Their match-

ing tolerance is 0.02% (2 ppm/

C) and their absolute tolerance is

0.1% (10 ppm/

C). RC has 0.05% tolerance.

•

For RTD2 inputs, use 0.05% tolerance resistors.

•

For linear mVdc, Vdc, and mAdc ranges, use 0.1% tolerance resis-

tors. Higher tolerances may cause significant errors. Correct any
errors due to resistor tolerance with the CLS's built-in linear scaling.
You can also install other components (like capacitors) for signal
conditioning; please consult Watlow Anafaze for more information.

NOTE

When adding your own scaling resisters to the 4 and 8 CLS,
the shorting pads of the RC must be cut before installing to
the bottom of the PC board.

A COM

A -

IN -

IN +

A +

CLS

Circuitry

Analog
Input
Terminal

Internal

+5 Vdc

Reference

C .47 uF

(RTD/Thermister)

( Voltage/Current)

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