Philips 273E3QHSB/93 Service Manual page 71

4.18.2 Total Harmonic Distortion
Total harmonic distortion shall be limited to 5% THD at the maximum wattage speaker
rating specified in section 1.3, at 1 kHz, when the input is 1.0Vrms.
4.18.3 Power Handling
Each speaker transducer shall accept up to the specified Wattage of audio power
without damage or exceeding the frequency response and total harmonic distortion
specifications.
4.18.4 Audio Amplifier
The amplifier shall provide two channels of audio up to 2 Watts per channel from 100 Hz
to 20 kHz, based upon an audio signal input of 1.0V RMS per channel.
4.18.5 Volume Control
For monitors with a manual volume control, the direction (at the bottom) of the bezel
volume control is "-" key for Minimum volume and "+" key for Maximum volume. The
default shipping position of the Volume Control shall be approximately 90%.
4.18.6 Speaker Sensitivity
The speakers shall support a minimum sensitivity of 75 dB +/- 3 dB at 2W/1m at 1 kHz.
4.18.7 Maximum Audio Card Output
The monitor audio amplifier shall accept a maximum input voltage of 1.5 Vrms and meet
the following requirements at the maximum monitor volume setting:
4.18.8 Monitor Audio Amplifier Input Impedance
The monitor audio amplifier shall have minimum 10K Ohm AC input impedanceFactory
requirements
Factory requirements are taken into account.
It needs to do calibration to make sure the same detection distance.
4.18.9 Service requirements
Service requirements are taken into account. In the factory mode, it needs to reserve the max. distance
adjustment value to adjust distance ranges.
VISUAL CHARACTERISTICS
Test conditions
Unless otherwise specified, this specification is defined
under the following conditions.
(1) Input signal : As defined in 3.3, follow panel resolution, signal sources must have 75 ohm
(2) Luminance setting : controls to be set to 300 nits with full screen 100 % duty cycle white signal
(3) Warm up: more than 30 minutes after power on with signal supplied.
(4) Ambient light: 400 -- 600 lux.
(5) Ambient temperature: 20 ± 5 C
1. The ratings of the audio amplifier may not be exceeded.
2. The ratings of the speakers may not be exceeded.
3. There must not be any clipping of the audio amplifier output signal.
Voltage dividers may be used to reduce the input signal level.
output impedance.
Meridian 3
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