SP395 SoundPro Audio Integrator
Form7492
Operation Manual
74
Amplitude Sweep
The Amplitude Sweep function is a non-acoustic, electrical test, used to measure the audio
frequency response of a device under test. This function varies the SoundPro generator output
frequency once per millisecond, in integer Hz values only, which results in a sonically smooth
sweep. The generator output is fed to the input of the device under test and the output of the
device is fed back to the SP395’s measurement input. As the generator is swept smoothly, the
measuring circuit averages the results over each of the 1/12 octave bands within the desired
sweep range.
This function measures the frequency response of a device by measuring the average level of
each 1/12 octave band in the selected sweep range while the generator smoothly sweeps the sine
wave. 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.
Amplitude Sweep Display and Controls
Amplitude Sweep test screen and description of control fields
.
1.
Test Function –
Identifies Amplitude Sweep as the menu selection.
2.
Graph Scale Range dBu
– Indicates range of dB level scale in dBu. Selects the highest
level of the dB range scale in 5 dB increments from -80 to +60 dBu.
3.
Test Results Graph
– Shows the test results of the amplitude dBu vs. frequency for the
device being tested.
4.
Graph Scale Resolution dBu
– Selects the graph resolution. 20 dBu, 40 dBu, or 80 dBu.
5.
Minimum Sweep Frequency
– Indicates minimum frequency of graphed amplitude
sweep test.. Adjustable field in octave steps to 10 kHz.
6.
Sweep Time Interval
– Time to sweep through selected frequency range. Selectable from
10 – 99 seconds.
7.
Cursor Frequency
– Indicates frequency at the position of the graph cursor. Select the
field and vary the control knob to move and position the cursor to the desired frequency
step.
8.
dB Level
– Indicates dB level of the cursor position on the graph or test results level.
