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The P750
generates sufficient power with the internal power amplifier
to energize all defects from air-gap problems, puffing
sounds, loose particles, constrained voice coil, cabinet
rattling, litze wire clatter, glue problems etc., which
generally speaking are known as Rub & Buzz distortion. |
The system consists of a 19" P750 cabinet with a 14 volt power amplifier.
The power amplifier has a 50 VA core as standard or as option a 120
VA core.
On the front a phantom powered XLR input for microphone, the phantom
power is controlled by software, and a speakon plug for internal
power amplifier output.
As an option a 2. input can be added with a Lemo connection used for
B&K, Grass, ACO etc. microphones including microphone psu with 28V
and 200V.
As an option a 2. or 3. BNC input can be added for CCP powered
microphones. Constant current is 4 mA.
On rear a jack output for external power amplifier and a input for
alternative input as for signal or impedance if interbnal power
amplifier is disabled. A 25 plole plug for digital in & outputs on
ttl level used for external control (automated test lines) and a USB
connector.
The P750 need a least USB 2.0 high speed connection (480 Mhz).
Sample rate 48 / 96 / 192 KHz and 24 bit.
The software is arranged in four modes, an operator mode, a
technician mode, a global set-up mode, and a utility mode, which all
are protected by passwords.
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The operator mode is for
day-to-day production testing of parameters aready set-up
in the technician mode. This mode is specially designed for
non skilled personnel or for fully automated operations.
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In the technician mode all
parameters as frequency range, test level, reference curves
limits, Rub & Buzz and THD filters etc. are customized to
the specific requirements for each individual test.
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In the global
set-up the graphical presentation, test control, paths for
files, chain of tests, statistics etc. are defined in the global
set-up the graphical presentation, test control, paths for
files, chain of tests, statistics etc. are defined.
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For
post-processing and manipulation of stored data there are a
number of Utility functions as Export and Import of data,
Statistical analysis and graphical display of batch data
etc. The statistical analysis including calculation of
various numbers of standard deviation and average curves to
determine the test limits. The analysis is able to find a
best matched measured unit against the average or another
unit.
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P750 can do following test parameters:
| Frequency response against upper / lower
limits |
Sensitivity against upper / lower limits with move option |
Impedance against upper / lower limits |
| Frequency response against 2. upper / 2. lower limits |
Sensitivity test point 1 |
Resonance |
| Frequency response against 3. upper / 3. lower limits |
Sensitivity test point 2 |
Qms |
| Average of Frequency |
Sensitivity test point 3 |
Qts |
| Average of Frequency in groups |
Sensitivity test point 4 |
F (Fres./Q) |
| Average1 of sensitivity point 1-5 |
Sensitivity test point 5 |
Voice Coil offset, BL |
| Average2 of sensitivity point 1-5 |
Rub & Buzz channel B against upper / lower limits |
EBP |
| Polarity |
Rub & Buzz channel D against upper / lower limits |
T/S parameters |
| Slope of frequency |
THD |
Cpk / Ppk |
Basic specifications:
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Analyzing channels: |
4 primary, 2 secondary |
Test points:
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500 |
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Sweep frequency: |
10 Hz – 30 KHz |
Sweep time:
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0.1 – 32 sec. |
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Filters: |
3 |
Filter frequency range: |
20 Hz – 45 KHz |
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Filter types: |
TRK-HP, FIX-HP |
Detector modes: |
Lin, Log & Spl |
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Input level: |
3.16 mV – 20 V |
Input impedance XLR: |
> 8 Kohm |
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Output Jack: |
Typ. 1.0 V rms |
Input impedance JACK: |
> 20 Kohm |
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PA output type 1: |
14 volt @ 8 ohm |
PA output type 2: |
14 volt @ 8 ohm |
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PA output type 1: |
12 volt @ 4 ohm |
PA output type 2: |
13.5 volt @ 4 ohm |
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PA output type 1: |
9.5 volt @ 2 ohm |
PA output type 2: |
11.5 volt @ 2 ohm |
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Phantom on XLR: |
+48 Volt, by software |
I/O functions TTL level: |
8 inputs, 8 outputs |
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Optional Input Lemo
plug: |
+28 & +200 Volt for
B&K,Grass, ACO etc. |
Optional Input
BNC: |
CCP Typical 4 mA |
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