User Manual    AMETEK Programmable Power 
RS Series    28 
2.6.4  -LF Option Specifications 
The -LF option limits the maximum available output frequency to 500 Hz. All other specifications 
of the RS90 system remain unchanged if this option is installed. 
2.6.5  WHM Option Specifications 
Watt-hour measurement mode: 
Accuracy: 
0-6.000KW    0.01KWH + 0.1%  <100 Hz 
      0.02KWH +0.1%  100-819 Hz 
>6.000KW    Times three of the above specification 
Resolution: 
0.001 KWH