Section 4: Using the Model 9100: AC Power Function - Operation 4.20-11
Final Width = 215mm
4.20.4.3 ‘Out of Range’
Any attempt to select a combination of voltage and frequency (including the application
of deviations and/or offsets) outside the constraints of the Volt-Hertz profile will not be
implemented.
Several user inputs may result in exceeding these constraints. As an extreme example,
attempting to edit the Power field, with sine waves selected and Ø = 90°, is impossible
becasue the power can only be zero. The message 9070 ,”Cannot change: phase = 90”
will be generated because it is not possible to resolve P=VI cosØ.
Similarly, at very high powers, if the phase angle is too high or the selected current is too
low, this could cause an error message to occur indicating too high a voltage demand.
If a high VA or power is being demanded, selecting Power rather than VA or reducing
the phase angle respectively, may cause errors due to exceeding the permissible operating
envelope. Alternatively, the instrument may attempt to give out a high voltage or current,
requiring user confirmation. This requires some thought on the part of the user.
Exceeding some part of the operating envelope will cause an audible warning to be given,
accompanied by a screen message: Out of range’.
Refer also to Section 4.4.6.
4.20.4.4 Power Factor (PF)
This field is 'read only'. It is calculated automatically according to the equation:-
Power in Watts
V
rms
Main x I
rms
Aux
Where I
rms
Aux is the displayed real or equivalent current.
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