Ampetronic FSM, Руководство пользователя, Страница: 9 / 16

9
4 Frequency Response
PURPOSE – check the frequency response is acceptable and adjust if
necessary
•
On the FSM: Select ‘Frequency response’ mode.
•
Use pink noise (CD track 2) as an input to the loop system.
•
At each measurement position (A-F), measure the readings with the
frequency filter set to 100Hz, 1kHz and 5kHz – record the readings as
‘initial’ values on the Certificate of Conformity.
o
The reading is the peak reading on the LED display
o
Readings at 100Hz and 5kHz should be within ±3dB of the reading
at 1kHz
o
If required, adjust the tone or Metal Loss Compensation (MLC) of
the amplifier to boost high frequencies and achieve ±3dB across
the three frequency bands.
•
When all points achieve ±3dB across the three frequency bands, record
the three readings at 100Hz, 1kHz and 5kHz at each measurement point
and record them as ‘final’ readings on the Certificate of Conformity.
•
If it is not possible to achieve the required ±3dB across the 3 bands,
contact Ampetronic to discuss your application.
Note – Due to the nature of the noise signal, and the method of testing the
100Hz measurement can be erratic. If the reading is unstable, record the
peak reading.