Selecting AC and DC + AC
Current measurements may be displayed as AC only or AC +DC, which indi-
cates that the measurement includes the DC component. Selection can be
made with (On & Smooth) during initial ON. Please note that the AC + DC
RMS value is not equal to the AC RMS reading plus the DC reading.
AC Current: Related Measurement Functions
In the current measurement mode further power quality analysis for cur-
rent is possible by pushing the following keys:
HARM Push button activation will change operating mode and
split screen for simultaneous measurements of:
• current,
• %THD or %DF
• bar graph display
Select individual harmonics from Hdc, H01 to H25. The
Model 725 will display the True RMS amplitude of the indi-
vidual current harmonic as well as the percentage relative to
the fundamental signal (%THD) or relative to the RMS value
(%DF) whichever is selected prior to or .
Hz Displays frequency measurements. In the HARM mode Hz
displays individual harmonic frequencies in the secondary
portion of the display.
RANGE Selects manual range of (0 - 60) or (0 - 600) amps.
Shift In AC or DC+AC: A → Peak → Crest Factor → THDF → A.
(yellow) In HARM mode: A → K Factor → A.
Push and hold (3 s) for battery life and voltage level check.
MIN/MAX Selects record function for MIN/MAX/AVG values.
SMOOTH Displays 3-second running average of measured value.
THDF Displays value for Transformer Harmonic Derating Factor
(yellow Shift push button 3 times).
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