Fluke 190 Series II User Manual page 124

Fluke 190 Series II
Users Manual
Duty Cycle (DUTY)
Range ..................................................... 4.0 % to 98.0 %
Resolution............................. 0.1 % (when period > 2 div)
Full Scale Reading................. 999 counts (3-digit display)
Accuracy (logic or pulse).................... ±(0.5 % +2 counts)
Pulse Width (PULSE)
Resolution (with off) .........................1/100 division
GLITCH
Full Scale Reading.......................................... 999 counts
Accuracy
1 Hz to full bandwidth...................... ±(0.5 % +2 counts)
Vpwm
Purpose ................ to measure on pulse width modulated
signals, like motor drive inverter outputs
Principle......... readings show the effective voltage based
on the average value of samples over a
whole number of periods of the fundamental
Accuracy............................ as Vrms for sinewave signals
V/Hz
Purpose .................... to show the measured Vpwm value
(see Vpwm) divided by the fundamental frequency
on Variable AC Motor Speed drives.
116
Accuracy ................................................... %Vrms + %Hz
AC motors are designed for use with a rotating
magnetic field of constant strength. This strength
depends on the applied vottage (Vpwm) divided
by the fundamental frequency of the appied
voltage (Hz). The nominal Volt and Hz value are
shown on the motor type plate.
Power (A and B, C and D)
Power Factor........................ ratio between Watts and VA
Range......................................................... 0.00 to 1.00
Watt ...................................RMS reading of multiplication
Full Scale Reading .......................................999 counts
VA ................................................................Vrms x Arms
Full Scale Reading .......................................999 counts
frequency
VA Reactive (VAR)........................................
Full Scale Reading .......................................999 counts
Note
corresponding samples of input A or C (volts)
and Input B or D (amperes)
√ 2 2
((VA) -W )