Input calibration – Watlow MLS User Manual
Page 50
38 MLS User’s Guide
Installation
This table shows scaling resistor values.
Input Calibration
The MLS provides offset calibration for T/C, RTD, and other fixed
ranges. It also provides offset and span (gain) calibration for linear and
pulse inputs. (Offset and span calibration convert linear analog inputs
into engineering units using the Mx+B function.) The offset range is -
300 to +300 units; the magnitude of the offset depends on the input type
and span you select.
Follow these steps to use the MLS' offset and span calibration:
1. Install scaling resistors that will provide an appropriate full scale volt-
age. (If you have any doubts about your ability to install scaling resis-
tors, contact Watlow-Anafaze.)
Input Range
RA
RB
RC
RD
All T/C, 0-60 mVdc
Jumper
RTD1 -100.0 to 300.0
º
C
RTD2, -120 to 840
º
C
RTD3, -70 to 300
º
C
5.49K
11.0K
11.0K
5.49K
11.0K
11.0K
80
100
100
0-10 mAdc
0-20 mAdc (4-20 mA)
-450 to
2500
Jumper
Jumper
6.0
3.0
0-100 mVdc
0-500 mVdc
0-1 Vdc
0-5 Vdc
0-10 Vdc
0-12 Vdc
499
5.49K
6.91K
39.2K
49.9K
84.5K
750
750
422
475
301
422
A COM
A -
RC
IN -
IN +
A +
RD
RB
To
MLS-AIM
Circuitry
Analog
Input
Terminal
Internal
RA
+2.5 Vdc
Reference
C .47 uF
C .47 uF