Measurement Of Active, Apparent And Reactive Power - W, Va, Var; Measurement Of Active, Apparent And Reactive Energy - Wh, Vah, Varh - Gossen MetraWatt METRAHIT ENERGY TRMS System Multimeter Operating Instructions Manual

5.7 Measurement of Active, Apparent and Reactive power – W, VA, VAr
Measurement of Active, Apparent and Reactive Energy – Wh, VAh, VArh
The METRAHIT ENERGY is a compact power meter for direct and
alternating current in single-phase systems. The current path can
be measured directly (up to 10 A, max. 5 min., up to 16 A briefly
for max. 30 s), or with the help of current transformers or current
clamp transformers.
Power Measuring Ranges
(without current clamp; clamp factor can be calculated)
I / U range 0.6 V
600 μA 0.36 mW
6 mA 3.6 mW
60 mA 36 mW
0.6 A —
6 A —
10 A (16 A) —
Bandwidth up to 1 kHz; signal components of higher frequency are clipped by in-
put filters.
The instrument automatically selects the measuring range which
allows for highest possible resolution of the applied quantities. It's
also possible to lock in the automatically selected measuring range
with the MAN / AUTO key. If the measuring range has been locked in,
this selection is retained when the instrument is switched to the
energy measuring mode.
A detailed description of the measuring range selection and the lock-in function
is provided in section 4.1.2 „Power and Energy Measurements" on page 17.
Note
If the measuring instrument activates a measuring range
which is too high during automatic measuring range
selection, this may be due to peak value monitoring (see
section 4.1.3 on page 17). Check the crest factor of the
respective signal in V
AC+DC
GMC-I Messtechnik GmbH
Measurements: V/Hz/dB – PQ/
6 V 60 V 600 V
3.6 mW 36 mW 0.36 W
36 mW 0.36 W 3.6 W
0.36 W 3.6 W 36 W
3.6 W 36 W 0.36 kW
— 0.36 kW 3.6 kW
— 0.6 kW (0.96 kW) 6 kW (9.6 kW)
or A .
AC+DC
– MHz/% – /nS/R
– /
SL
Significance of the Power Factor
1: no phase shifting
–(0 ... 0.99): capacitive; +(0 ... 0.99): inductive
–/N
~
+/L
Ð First disconnect supply power from the measuring circuit or
the power consumer, and discharge any capacitors.
Ð Set the rotary switch to W. The instrument displays RMS
values for voltage and current, as well as active power.
Ð You can switch the display back and forth amongst active,
reactive and apparent power with the
power factor).
Ð The extreme values can be displayed by pressing the DATA/MIN/
MAX key.
Ð Press the FUNC | ENTER key in order to measure active,
apparent and reactive power.
Ð Connect the current and voltage path as shown above.
– Temp – /m – W/Wh – A/Hz/thd

V
COM
Temp
mA A
 
and keys (including
47