SATEC RDM172 Manual - Manual (Page 75)

Chapter 4 PAS Application Software General Meter Setup
Series PM172 Powermeters 75
Scaling Analog Outputs for 0-2 mA and ±2 mA
The output scales for 0-1 mA and ±1 mA analog outputs are programmed for
0 mA and +1 mA regardless of the desired output current range. To use the
entire output range of 2 mA or ±2 mA, set the analog output scales in your
device as follows:
0-2 mA: set the 1 mA scale to 1/2 of the required full scale output for uni-
directional parameters, and set the 0 mA scale to the negative full scale
and the 1 mA scale to zero for bi-directional parameters.
±2 mA: set the 1 mA scale to 1/2 of the required full-scale output for both
uni-directional and bi-directional parameters.
For example, to provide the 0 to 2 mA output current range for volts
measured by the meter in the range of 0 to 120V, set the 1 mA scale to 60V;
then the 120V reading will be scaled to 2 mA.
Programming the Analog Expander
Your meter can support up to two analog expanders that are connected
through a serial RS-422 interface to the meter port COM2. Each expander
has its own address 0 or 1 on the serial interface and provides 8 analog
channels with options for 0-1mA, ±1mA, 0-20mA or 4-20mA output currents.
To configure the Analog Expander outputs in your device, select General
Setup from the Meter Setup menu, and then click on the Analog Expander
tab.
The expanded analog outputs are enumerated in the following manner:
analog output channels 1 through 8 are associated with the analog expander
with address 0, while channels 9 through 16 are associated with the analog
expander with address 1.
The available analog expander outputs options are described in the following
table.