Dynacord DPA 8150, User Manual

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Notice!
When the measurement is performed, the output transformer is in the measurement branch.
For measurements without an external load at the output on the DPA output stage, the
measured value represents the input impedance value of the transformer. In the case of a
short-circuit at the output on the DPA output stage, the measured value represents the
output impedance value of the transformer.
Notice!
The choice of test signal (frequency and voltage level) has a great influence on the accuracy
of the impedance measurement. In general, the higher the measurement signal and the closer
to 1 kHz, the more accurate the measurement result.
Output stage Measuring range for a tolerance of ±20%
Type Serial number Measurement signal 1 kHz/
10 V Measurement signal 66 Hz/
10 V
DPA 8150 ≥ 20855 20–3,000 ohms, 3–500 W 20-1,000 ohms, 10–500 W
DPA 8225 ≥ 20400 40-4,200 ohms, 2.4-250 W 40-1,400 ohms, 7.1-250 W
DPA 8412 ≥ 20419 80-6,000 ohms, 1.7-125 W 80-2,000 ohms, 5-125 W
Table 7.4: Impedance measuring ranges (output voltage: 100 V)
Notice!
The total impedance connected at the output on the amplifier (s lines) must be
within the specified impedance range in terms of the test frequency (see the table entitled
“Impedance measuring ranges”).
Notice!
To detect a line interruption to a single speaker, or the failure of a single speaker, the
following instructions must be observed: Do not connect more than five speakers to one
speaker line. All speakers on the speaker line must have the same impedance.
Operation
Fault monitoring
The following functions of the DPA output stage can be monitored:
•
Mains under-voltage
• Battery under-voltage
• Excessive temperature
• Overload
• Output voltage
• Output current
• Ground fault
• Pilot tone monitoring
• Monitoring of the microprocessor
• REMOTE CAN BUS connection
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PROMATRIX 8000 POWER AMPLIFIER Safety information | en 31
User manual 19-Aug-13 | 03 | F01U217494