Filter
Top Products
Performance Check and Calibration Procedures
5–10
760A / 760D / 760N
16. Check Dynamic Response (760A only)
Attack Time
a. Set S340 to position 6, and turn off (release) the PEAK HOLD control.
b. Connect the output of the audio signal generator to the LEFT AUDIO
INPUT. Set the generator frequency to 10 kHz, and set the output level
for a bar reading of 0 dB (top green LED on).
c. Set S340 to position 2, and turn on the PEAK HOLD control.
d. Without changing the frequency or output level of the audio generator,
set it for:
On Cycles: 50
Off Cycles: 50,000
Mode: Tone Burst
e. CHECK – that the peak–held reading is between the +4 dB and –4 dB
scale marks ("0.75 dB with S340 at position 2).
f. Set S340 to position 3, and change the audio generator On Cycles to 5.
Do not change any other generator settings.
g. CHECK – that the peak–held reading is between the +4 dB and –4 dB
scale marks ("2.0 dB with S340 at position 3).
Decay Time
h. Set S340 to position 0, and set the audio generator to:
On Cycles : 10,000
Off Cycles: 25,000
i. CHECK – that the bar does not decay below –24 dB at it’s lowest point
(between bursts).
j. Change the audio generator Off Cycles to 31,000.
k. CHECK – that the bar does decay below –24 dB at it’s lowest point
(between bursts).
l. Repeat parts a through k of this step for the RIGHT and then the
AUXILIARY AUDIO INPUTS in turn.
m. Set S340 to position 0. Reset the Input Termination, Sensitivity and
Orientation jumpers to fit your application. Factory set positions are:
Input Sensitivity: 8 dB
Input Termination: INF
Display Orientation: Sound Stage
See Figure 5–1 for jumper locations.
This concludes the 760A / 760D / 760N Performance Check Procedure