Owner's manual

Chapter 4 PAS
Application Software
General Meter Setup
Series PM174 Powermeters 77
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