1GA16_1L.DOC ROHDE & SCHWARZ17
FIG 7: Impedance characteristic and evaluation of a multi-path loudspeaker
(Trace B shows the impedance characteristic referenced to a "golden unit")
5.1.5 Resonance Frequency and Resonance Impedance
The resonance impedance Z
r
is the first main maximum in the impedance curve at the resonance
frequency f
r
. The two quantities can be directly read from the impedance curve with the aid of a graphics
cursor. In the program they are obtained by scrolling up through the obtained impedance value array. The
maximum is considered found if N RUNAWAYS +1 (see section 5.1.2, Special Notes on Entry of
Parameters) are found in successive values in the descending order.
5.1.6 Absolute Minimum and Maximum Impedance
The absolute maximum of impedance Z
max
is normally not identical with the resonance impedance.
Using softkeys
⇒ Cursor --> set to --> max A
the (active) graphics cursor is set to the maximum and the impedance and associated frequency can be
read from the display. Correspondingly, the absolute minimum is determined with softkeys
⇒ Cursor-->set to-->min A
This method is also used in the program.
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