Concept And Introduction - Hameg HM8015 Handbuch

C o n c e p t a n d I n t r o d u c t i o n

Concept and Introduction

Concept of the HM8015
The HM8015 uses true rms converters for
measuring voltage and current. The instan-
taneous power is measured using an analog
multiplier. The active power is derived by inte-
grating the instantaneous power for a period T.
All other values are calculated.
The apparent power:
S = V x I .
rms rms
The reactive power
2
Q = S – P
The power factor PF = P/S. This will always yield
the correct power factor because the cosj is only
defined for purely sinusoidal signals. However,
in SMPS, motor controls etc. nonsinusoidal
signals are prevalent.
Introduction to the Operation of the
HM8115-2
Please read the instruction manual
carefully.
At first time operation please observe the
following recom-mendations:
– The mains voltage selector at the mainframe
HM8001-2 has been set to the correct voltage,
and the correct fuse has been installed inside
the mains connector.
– Proper connection to an outlet with safety
ground contact or an isolation transfomer
has been made.
– There are no visible damages to the
instrument
– There are no loose parts floating around
inside the instrument.
Turn-on of HM8015
After turn-on the display will show the instrument
type „HM8015" and then the number of the
28
Subject to change without notice
2
firmware (e.g. „1.01). The instrument will
automatically go into the active power measure-
ment mode, the LED „WATT"
Afterwards the instrument will select the
smallest possible range for voltage and current.
Please pay attention to the safety instruc-
tions on page 30
will light up.