This is a special order item and is non-cancelable and non-returnable. Est. arrival at B&H is 7-14 business days (subject to availability). You will be charged upon placing your order.
The 10-A Analog Loudness Meter +14dB is a smaller single channel version of Dorrough's standard 40-A loudness monitor, with Phoenix (euroblock) connectors. This meter requires rack mounting and has an external power supply.
Actual Energy Display
Dorrough Loudness Meters display actual energy content of the program material, regardless of frequency, while still indicating the peak amplitude of the complex audio signal. This feature allows all program material to be adjusted for equal perceived loudness while protecting the peak of the
waveform.
Peak and Average Level Metering
The 10-A, like all Dorrough loudness meters, simultaneously displays peak and average. The relative difference, in dB, between these two ballistics is derived from the integration time of the persistence scale.
Stereo Mixing
With one instrument, the operator can easily see the stereo mix and avoid classic in-phase/out-of-phase problems as well as center channel buildup causing a mix to seem louder. This is especially important in preparing stereo program material for broadcast, while still being able to maintain monaural compatibility.
Input Impedance
20k Ohm balanced, 10k Ohm single-ended, ±2%
Common Mode Rejection Ratio
80dB at 60Hz, 60dB at 20KHz (balanced mode)
Input Sensitivity
-10dB for full-scale display
Maximum Input Level
+24dB before clipping
Signal Path Bandwidth
10Hz - 25KHz, ± .25dB
Signal Path Distortion
Less than 1% THD at 1KHz, +24dB input
Sum Error
Less than 0.1dB at 1KHz
Difference Error
Less than 0.1dB at 1KHz
Display Resolution
Less than 0.1dB at 1KHz
Step Size Error
± 0.25dB
Absolute Error
Full Scale -39dBu: ± 0.25dB model A,B,C
Drift
± 0.25dB
Average Time Constant
600mS, ± 6%
Peak Acquisition Period
10uS, to full-scale, sine input 25KHz
Peak Attack Period
Virtually instantaneous
Peak Decay Period
180mS, from full-scale to all LEDs off (models A, B, C)
Display Update Rate
Approximately 10mS
Display Duty Cycle
Display Time, AVERAGE, PEAK HOLD - 75%
Display Time, PEAK - 100%
Power Supply Input Range
117/237VAC RMS, -20% to +10%, 50-60Hz
Calibration Controls
None Needed
User Controls
Left/Right input sensitivity Option DIP Switch
A) Peak Auto [ON]
B) Difference Mode [ON/OFF]
C) Over Level Alarm [ENABLE]
D) Under Level Alarm [ENABLE]
E) Auto ARMP
User Port
DB-9 Connector A) Alarm relay closure contacts 1 form C, 1A, 30V AC or DC