SATEC RDM172 Manual - Manual (Page 74)

Chapter 4 PAS Application Software General Meter Setup
74 Series PM172 Powermeters
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.
Scaling Non-directional Analog Outputs
When programming scales for non-directional analog outputs with a 0-1mA,
0-20mA or 4-20mA current option, you can change both zero and full
engineering scales for any parameter. The engineering scale need not be
symmetrical.
Scaling Directional Power Factor
The engineering scale for the signed power factor emulates analog power
factor meters. The power factor scale is -0 to +0 and is symmetrical with
regard to
±1.000 (-1.000 ≡ +1.000). Negative power factor is scaled as
-1.000 minus measured value, and non-negative power factor is scaled as
+1.000 minus measured value. To define the entire power factor range from
-0 to +0, the default scales are specified as -0.000 to 0.000.
Scaling ±1mA Analog Outputs
Programming engineering scales for directional ±1mA analog outputs
depends on whether the output parameter represents unsigned (as volts and
amps) or signed (as powers and power factor) values.
If the output value is unsigned, you can change both zero and full
engineering scales.
If the parameter represents a signed (directional) value, you should provide
only the engineering scale for the +1 mA output current. The engineering
scale for the 0 mA output current is always equal to zero for all values except
the signed power factor, for which it is set to 1.000 (see “Scaling Directional
Power Factor” above). The device does not allow you access to this setting if
the parameter is directional. Whenever the sign of the output parameter is
changed to negative, the device automatically uses your full engineering
scale settings for +1 mA with a negative sign.