XP7000/XP5000
37
3.5.3
Attenuator
With the attenuator set to the -10 dB position, input a 1 kHz, -10.0 dBu sine wave signal to the input terminal and check that an
output voltage 12.0
±
3.0 dBu is obtained.
3.5.4
PARALLEL mode
Set the MODE switch to PARALLEL.
Input a 1 kHz, -10.0 dBu sine wave signal to the input terminal of the A channel and check that +22.0
±
0.5 dBu output voltage
is obtained for both channels.
Do not input any signal to the input terminal of the B channel.
3.6
Frequency characteristics
Input 20 Hz, 1 kHz, 20 kHz, -10 dBu signals and check that the output voltage obtained is within -0.5
±
0.5 dBu at 20 Hz and
20 kHz as compared with the output voltage at 1 kHz.
<Set the HPF switch to 20 Hz>
Input a 20 Hz, -10 dBu signal and check that the output voltage is within -3.0
±
2.0 dBu as compared with the output voltage
at 1 kHz, -10 dBu in the HPF OFF state.
<Set the HPF switch to 55 Hz>
Input a 55 Hz, -10 dBu signal and check that the output voltage is within -3.0
±
2.0 dBu as compared with the output voltage
at 1 kHz, -10 dBu in the HPF OFF state.
3.7
Distortion
Input 20 Hz, 20 kHz signals to the input terminal and check that the distortion is 0.1% or less when the rated output as
specified in the table below is obtained.
This inspection should be completed within 30 seconds.
3.9
Output noise level
Shunt 2 pin (hot) and 3 pin (cold) of input terminals with 600 ohms.
Measure the noise level at the output terminal and check that it is -65 dBu or less.
Set the attenuator to MIN and check that the noise level is -70 dBu or less.
Use a DIN AUDIO filter for this measurement.
3.8
Channel separation
Input a 1 kHz signal to the A channel and shunt 2 pin (hot) and 3 pin (cold) of input terminals of the B channel with 600 ohms.
Set the output of the A channel as specified in “Output level of the channel with signal input” section in the table below.
Check that the output voltage of the B channel is less than the value specified in “Output level of the channel terminated”
section in the table below. Reverse A and B channels and perform the same check.
Use a DIN AUDIO filter for this measurement.
Output level of the channel
with signal input
Output level of the channel
terminated
XP7000
36.7 dBu
(350 W)
-33.3 dBu
XP5000
63.25 V
(500 W + 500 W)
XP7000 (U/T/A)
74.82 V
(700 W + 700 W)
XP7000 (H/B/K/O)
72.12 V
(650 W + 650 W)
XP5000
35.3 dBu
(250 W)
-34.7 dBu
