SATEC PM175 Manual - Manual (Page 73)

‎Chapter 4 PAS Application Software General Meter Setup
Series PM175 Powermeters 73
Scaling Analog Inputs for 0-2 mA and ±2 mA
The input scales for 0-1 mA and ±1 mA analog inputs are
always programmed for 0 mA and +1 mA regardless of the
desired input range. If you want to use the entire input range of
2 mA or ±2 mA, set the analog input 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 convert voltage readings from the analog
transducer that transmits them in the range of 0 to 2 mA to the
range 0 to 120V, set the full range for the +1 mA analog input
to 60V; then the 2 mA reading is scaled to 120V.
Programming Analog Outputs
The meter can be ordered with two optional analog outputs
with options for 0-1mA, ±1mA, 0-20mA or 4-20mA output
currents.
The 0-1mA and ±1mA current outputs provide a 100%
overload, and actually output currents up to 2 mA and ±2mA
whenever the output value exceeds the engineering scale set
for the 1 mA or ±1mA.
To configure the Analog Outputs in your device, select
General Setup from the Meter Setup menu, then click on the
Analog Outputs tab. If you are programming your device
online, analog outputs are designated as not available if they
are not present in the device.
The available analog output options are described in the
following table.
Option Range Description
AO type 0-1mA
±1mA
0-20mA
4-20mA
The analog output type. When connected to the
meter, shows the actual AO type read from the
device. When working off-line, select the analog
output option corresponding to your meter.
Output
parameter See Appendix B Selects the measured parameter to be transmitted
through the analog output channel.
Zero scale Defines the low engineering scale (in primary units)
for the analog output corresponding to a lowest
(zero) output current (0 or 4 mA)
Full scale Defines the high engineering scale (in primary units)
for the analog output corresponding to a highest
output current (1 or 20 mA)
When you select an output parameter for the analog output
channel, the default engineering scales are set automatically.
They represent the maximum available scales. If the
parameter actually covers a lower range, you can change the
scales to provide a better resolution on the analog outputs.