Fluke 39, User Manual

Page: 31 / 74

Display Screen
21
Table 3. Screen Abbreviations
Screen Usage Name and Description
° d
Phase Angle degrees. (
±
180
°
)
Measures time from the positive zero crossing of the
fundamental of the selected volts or amp
P
REF. 360
°
represents one cycle at the fundamental or selected
harmonic frequency. A positive sign indicates that the
positive zero crossing of the measured cycle comes
earlier than (leads) that of the reference.
Note
For the Watts
h
screen, the phase angle always shows the
relation of Amps to the Volts
PREF at the same frequency. Cos
φ
calculations are based on this definition.
A RMS Amps RMS (includes dc component if using dc capable
current probe).
A PK Peak Amps (1/2 peak-to-peak value).
A DC Amps DC.
A HM For a current waveform, A HM identifies the total
harmonic current present.
A LEAD Amps Lead Volts
Evidence of capacitive reactance in the system; the
current waveform precedes the voltage waveform.
A LAG Amps Lag Volts
Evidence of inductive reactance in the system; the
current waveform occurs after the voltage waveform.
CF Crest Factor
Ratio of a waveform’s peak value to its rms value.