SP395 SoundPro Audio Integrator
Form7492
Operation Manual
87
Impedance Meter Operation
1.
Connect the special cable to device or system.
Use the specialty Impedance Test Cable,
Sencore #39G1171. Plug this connector into the 1/4” TRS output (phone) jack, next to the
male XLR output jack.
2.
Connect load.
Connect the test lead clips to the speaker, system input or other load to be
measured.
3.
Select frequency.
Select the frequency at which you wish to test the device impedance.
This is selectable in the generator frequency field in the bottom Toolbar.
4.
Turn on the generator.
The generator output level is fixed for this test.
5.
Read impedance value.
Read the impedance in ohms.
6.
Select system voltage.
If desired, select the system voltage. The function will then
compute the power required to drive the system to full output.
Impedance Sweep
The Impedance Meter measured the impedance of a load, such as an audio speaker, to a single
test frequency. The Impedance Sweep test measures impedance as well but sweeps the applied
test frequency through a user selected range. The resulting impedance through the range is
measured and graphed on a display showing details of how the impedance changed with
frequency. The graphed test data offers an impedance frequency response analysis.
The Impedance Sweep test plots the impedance of an externally connected load in each 1/3 or
1/12 octave band, as the signal generator is swept through the selected frequency range. The
results are plotted graphically on the screen. The x-axis scale maximum may be varied from 20
to 8000 ohms full scale. The endpoints of the sweep can be set to any octave point. As the
generator is swept in steps, the Impedance Sweep function computes the results for each of the
1/12 octave bands. You can set the starting and ending frequencies to any ISO standard 1/3
octave frequency, and the sweep time from 10 to 99 seconds.
Impedance Sweep Display and Control
Impedance Sweep Display and a description of its control fields.