Dynatech TD10000Q Instructions pour l'utilisateur - Page 7
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AMPLIFIER
Precautions
Introduction
Headroom, Sensitivity and VPL/Gain settings
The input amplifier and limiter system is designed to accommodate extreme of performance.
Typically, exceeding maximum input by much as +10dB will only result in a 1% increase in
distortion. The following schematics illustrate how the adjustable VPL and Gain circuitry
affect input sensitivity and output power.
The tables of the figure 4 showed input sensitivity for TD-10000Q with 2 ohm load and 141V
peak (max.) and 42V peak (min.) respectively for the eight different gain stages between
+23dB and +44dB. The resulting output power is displayed in dBu, Vrms and Watts in the
tables to the far right.
The headroom available through the input stage to the clip limiter is shown by the dotted
lines as +10dB at 141V peak and +20.4dB at 42V peak. These lines illustrate the additional
signal level that can be accepted at the input before any significant distortion will appear at
the input stage.
If you use the level potentiometer in the signal chain to reduce the level by an
amount greater than the headroom relative to input sensitivity, AND you drive the
NOTE
amplifier to clip level, you are in danger of clipping the input stage before the
current or voltage peak limiters are activated.
When bridging two channels, you must add +6dB to the input sensitivity to
achieve maximum output voltage due to the automatic -6dB gain compensation
NOTE
inserted by the amplifier.
Input Amplifier
Gain select switches
VPL set to 141 V
PEAK
Input
Gain set to:
sensitivity
(DIP-switches)
dBu / V
rms
-2.0 / 0.6
+44 dB
1.0 / 0.9
+41 dB
4.0 / 1.2
+38 dB
7.0 / 1.7
+35 dB
10.0 / 2.5
+32 dB
13.0 / 3.5
+29 dB
16.0 / 4.9
+26 dB
19.0 / 6.9
+23 dB
VPL set to 42 V
PEAK
Input
Gain set to:
sensitivity
(DIP-switches)
dBu / V
rms
-12.3 / 0.2
+44 dB
-9.3 / 0.3
+41 dB
-6.3 / 0.4
+38 dB
-3.3 / 0.5
+35 dB
-0.3 / 0.7
+32 dB
2.7 / 1.1
+29 dB
5.7 / 1.5
+26 dB
8.7 / 2.1
+23 dB
*) Headrom limited to +8dB at Gain set to +23dB at Max. VPL
TD10000Q
Front Panel
Rear Panel
Level control
Clip Limiter
Front panel
Dynamic Gain
potentiometer
reduction
+10 dB headroom to clip
relative to input sensitivity *)
+20.4 dB headroom to clip
relative to input sensitivity *)
Figure 4
TD10000Q VPL and GAIN settings
Operation and Performance
Voltage Peak Limiter
VPL select switches
Hard/Soft switch
Voltage Clip sensing
Current Clip sensing
Voltage Peak
Limiter set to:
(DIP-switches)
141 V peak
118 V peak
100 V peak
85 V peak
71 V peak
59 V peak
50 V peak
42 V peak
Output Power Amplifier
Class TD
Control Mute
Monitoring Level
Temperature
Fault/Warning
Output
Output
power
power
dBu / V rms
Watt
42.2 / 100
1200 W
40.7 / 84
880 W
39.2 / 71
630 W
37.8 / 60
440 W
36.2 / 50
310 W
34.7 / 42
220 W
33.1 / 35
160 W
31.8 / 30
110 W
6