PC9501N
29
1-2-8.
Channel separation
Feed the sine wave given in the below table to the input terminal of one channel and measure the output voltage (reference
voltage). Then, measure the output voltage at the other channel grounded via a 600
Ω
resistance and check that it is -70 dB
or less as compared with the reference voltage (0 dB).
1-2-9.
Output noise level
Set the input attenuator at MAX and ground the input terminal via a 600
Ω
resistance, then measure the noise level at the
output terminal and check that it is –65 dBu or less. Next, set the input attenuator at MIN, then measure the noise level again
and check that it is –70 dBu or less.
1-2-10. Stability
Feed 1 kHz, –10.0 dBu rectangular wave and connect a resistance of only net capacity of 10 pF to 0.47
µ
F, then check that
the following conditions are satisfied.
1-2-11. Protection circuit
Feed 10 Hz, +10.0 dBu sine wave and have the output waveform clipped, then check that the protection circuit functions to
prevent the relay from opening. Next, feed 1 Hz, 5.0 dBu sine wave, then check that the protection circuit functions within 2
seconds to shut off the output.
After that, turn off the input signal and turn on the POWER SW again, then check that the PROTECTION LED lights in red
and the POWER LED lights in green. Also check that the muting function is cancelled about 9 seconds after that.
1-2-12. Efficiency
Feed 1 kHz, 0 dBu sine wave to the input terminal, then measure the primary power and check that the measured value is
within the range given in the table below.
Next, ground the input terminal via a 600
Ω
resistance, then measure the primary power and check that the measured value
is within the range given in the table below.
1-2-13. PC limiter and compressor
Feed 1 kHz sine wave with input given in the below table to the input terminal and connect a 1
Ω
(
±
5%) resistance to the
output terminal, then check that output given in the table below is obtained. Also check that the total harmonic distortion given
in the table below is satisfied.
PC9501N
1 kHz, 6.0 dBu
Overshoot
Vp/Vo
≤
2.5
Ringing
Ringing should converge within 7 waves and cause no oscillation, etc. occur.
PC9501N
450
±
30 W
PC9501N
60
±
10 W
Input
Output
THD
PC9501N
0 dBu
28.5
±
2.0 dBu
5% or less
Vp
Vo
