ZES ZIMMER LMG450, Руководство пользователя

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Z E S ZIMMER Electronic Systems GmbH Chapter 8
119
8 100 Harmonics measuring mode (option L45-O8)
In the 100 Harmonics measuring mode the LMG450 works as a high precision harmonic
analyser. The difference to the prCE mode is, that 100 harmonics, the phase angles and the
power harmonics are measured. The frequency range is much wider. There is no check against
any limits.
8.1 Measuring configuration (Measuring)
When you came to this menu by pressing Measure you first have to choose MODE and then
HARM to enter this mode. The well known setting menu with the three tabs („Globals“,
„Group A“ and „Group B“) opens:
Globals Here you can set up the wiring in which is measured.
Group A/B For the settings in this menu refer 5.1.2 Group A/B tab. One additional setting
is possible:
FDiv This defines a frequency divider for the basic wave. With a value of 1 the
measured frequency is identical to the basic wave. With a value of 2 the
fundamental has only the half frequency of the measured frequency (e.g.
A 50Hz signal with FDiv = 4 is analysed on a 12.5Hz base. So you get 3
interharmonic between the 50Hz Harmonics)
Only with FDIV set to 1 you get the THD values of the signals
Pressing the rotary knob you will get to the main menu.
Figure 37: Measuring menu in Harm100 mode