4.16
4.15 Scaling ( calibration ) of the external analogue inputs
The external analogue inputs are scaled via the MANUAL CAL menu entry. The
mechanism for scaling of the inputs is to specify the variable value that corresponds
to the minimum analogue input ( 0 or 4mA ) and the maximum analogue input (
20mA ). The instrument then applies a linear scaling to input signals between these
limits. The user also defines if the analogue input is true zero ( 0-20mA ) or live zero
( 4-20mA ). The variable value specified for the maximum analogue input value (
20mA ) must be a positive number and must be greater than the variable value
specified for the minimum analogue input ( 0 or 4 mA ). The procedure for definition
of the analogue input scaling is given in table 4.10.
Table 4.10 External analogue input scaling
L MENU to obtain top level menu
CALIBRATE/SETUP
ALARMS/FAULTS
L ENTER
MANUAL CAL
AUTOCAL
L ENTER
ENTER PASSWORD
0000
To change the value of a digit L > or ?
To change to another digit L = or <
When the number shown is correct L ENTER
CALIBRATE
E1 Extern mA
89
Use
L > or ? until selected analogue input is
displayed then
L ENTER.
SCALE INPUT L ENTER
E1 MINIMUM INPUT
TRUE 0/LIVE 0
L = or < to select desired choice then L
ENTER
E1 MINIMUM 0mA=
000.00 mA Extern
Change the number to the variable value that
corresponds to the minimum analogue input.
Any digit position may be used for the decimal
point except the right most digit.
To change the value of a digit
L > or ?
To change to another digit L = or <
When the value shown is correct L ENTER
E1 MAXIMUM 20mA=
000.00 mA Extern
Change the number to the variable value that
corresponds to the maximum analogue input.
Any digit position may be used for the decimal
point except the right most digit.
To change the value of a digit L > or ?
To change to another digit L = or <
When the value shown is correct L ENTER
SCALE INPUT To set up the other input L QUIT and select
MANUAL CAL from the menu.
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