If the loop power supply is off, the MC 75.2 simulates a
passive transmitter supplied with 24 V externally.
When the square law scale is selected, it must be acti-
vated by using the
Configuration
Set to scale
menus.
Once "set to scale" is activated, the user enters the val-
ues to be simulated in a unit of the new scale.
The MC 75.2 indicates the configuration selected in the
window, using the following icons:
: to show loop power supply off.
: to show loop power supply on.
: to show square law scale.
Refer to § 2.2.2 "Current measuring (DC)" for an explanation of the square law scale.
2.3.3
Resistance generation
•
Display the
TRANSMISSION CONFIGURATION
dialogue box.
•
Select the
Ohm
measurement function. Select the
Idc
measurement function, then the range using the
function and navigation keys.
•
Select the measurement current.
•
Confirm with ENTER.
The following ranges are available:
Range
40 Ω
400 Ω
4000 Ω
Resolution
1 mΩ
1 mΩ
10 mΩ
Measurement current
1-10 mA
0.1-1 mA or 1-10 mA
0.1-1 mA
Settling time
< 1 ms
< 1 ms
< 1 ms
If the measurement current is very high, the message "Out of Range" is displayed in the
transmission window.
The resistance simulation function can be used with either 2, 3 or 4 wire connection.
IMPORTANT!
If a polling acquisition system is used, ensure that the current is maintained for more
than 1 ms to avoid measurement errors due to the response time of the resistance simu-
lation function.
