Bose ControlSpace ESP-00 II Service Manual page 79

4.4 On the 'Analyzer' Panel, set the 'BW' to '22Hz' and '20kHz LP'. Set the 'Fltr' to
'A-Weighting'.
4.5 Allow a few seconds for equipment
settling time and read and record the value
in the 'Function' window. See Figure P.
The recorded value should be <-84 dBu
(between -84 dBu and -200dBu).
Note: The noise measurement is made
with no input signal and is indicative of the
systems white noise level. This level may
be close to the threshold of -84dBu and a
stable test environment is essential. There
should not be any poor quality cables or
loose connections in the system as this will manifest itself in an increased noise level, possibly
failing this test.
4.6 On the 'Analyzer' Panel, Reset the 'BW' to '<10Hz' and 'FS/2'. Set the 'Fltr to 'None'.
4.7 On the Generator Panel, Set the 'Freq'
to '20.000 kHz' and Turn the 'Outputs' ON.
See Figure Q.
4.8 On the Analyzer Panel, Read and
Record the 'Level' value. It should be
within +/-1.5 dBu of the 1kHz level to pass.
Note that the Frequency is 20.000kHz
±20Hz.
4.9 Change the 'Freq' to '20Hz'.
4.10 Read and Record the 'Level' and
'Freq' on the 'Analyzer' panel. The values
should be +0.0 and +3.0 dBu and 20hz
±1Hz
4.11 Reset the 'Freq' value to 1.00000kHz.
4.12 On the 'Analyzer' panel, set the
'Function' to '%' and Set the 'Measurement
Function' to 'THD+N Ratio'
4.13 Allow a few seconds for settling and
Read and Record the 'Function' value.
A passing value is <0.015%.
4.14 Change the 'Amplitude' to +19.5dBu.
4.15 Read and record the 'Function' value.
A passing value is <2.0%.
TEST PROCEDURES
79
Figure P
Figure Q
Figure R
Figure S