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User manual Dorrough 400-A - Jumbo Analog Loudness Meter 400-A

Operating instructions and pdf manual for use - Dorrough 400-A - Jumbo Analog Loudness Meter 400-A User manual, User manual Dorrough 400-A - Jumbo Analog Loudness Meter 400-A, Dorrough, 400-A, Jumbo, Analog, Loudness, Meter, 400-A,


User manual for Dorrough 400-A - Jumbo Analog Loudness Meter 400-A

Dorrough 400-A - Jumbo Analog Loudness Meter 400-A
  • Manufacturer: Dorrough
  • Basic description and contents of package
  • Product classification: Pro Audio - General Accessories - Metering
  • Safety instructions
  • Startup and operation of the metering
  • Tips for setting up your Dorrough
  • Settings and expert assistance
  • Contact Dorrough service
  • Troubleshooting
  • Warranty information
We recommend checking out our discussion threads on the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A, which address similar problems with connecting and setting up Metering Dorrough.



User manual for the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A

The user manual for the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A provides necessary instructions for the proper use of the product Pro Audio - General Accessories - Metering.

The Dorrough 400-A is a very large professional analog loudness meter, visible from distances of over 50 feet, designed for modern theater and concert audio requirements, and offering simultaneous average and peak program display, with separate ballistics and lightning-fast response. This meter is equipped with a 40-LED bar graph, showing 1dB of resolution per LED, and 14dB of headroom.
If you own a Dorrough metering and have a user manual in electronic form, you can upload it to this website using the link on the right side of the screen.

You can upload and download the manual for the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A in the following formats:
  • *.pdf, *.doc, *.txt, *.jpg - Other formats are unfortunately not supported.
Additional parameters of the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A:
Input Impedance 20 kOhm balanced
10 kOhm single-ended, +/- 2%
Common Mode Rejection Ratio 80 dB at 60 Hz
60 dB at 20 kHz (balanced mode)
Input Sensitivity -10 dB for full-scale display
Maximum Input Level +24 dB before clipping
Signal Path Bandwidth 10 Hz - 25 kHz, +/- .25 dB
Signal Path Distortion >1% THD at 1 kHz, +24 dB input
Sum Error >0.1 dB at 1 kHz
Difference Error >0.1 dB at 1 kHz
Display Resolution 40 LEDs, 1 dB/LED
Step Size Error +/- 0.25 dB
Absolute Error +/- 0.25 dB (Full Scale -39 dBu)
Drift +/- 0.25 dB
Average Time Constant 600 mS, +/- 6%
Peak Acquisition Period 10 uS, to full-scale, sine input 25kHz
Peak Attack Period Virtually Instantaneous
Peak Decay Period 180 mS, from full-scale to all LEDs off
Display Update Rate Approximately 10 mS
Display Duty Cycle Display Time, AVERAGE, PEAK HOLD - 75%
Display Time, PEAK - 100%
Power Supply Input Range 117/237 VAC RMS, -20% to +10%, 50-60 Hz
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
B) Mode control switch (user supplied)
C) PEAK function switch (user supplied)
Dimensions (WxDxH) 23 x 8 x 4.25" (584.2 x 203.2 x 107.95mm)
Weight 6.9 lb (3.1 kg)
The user manual for the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A can be downloaded in .pdf format if it did not come with your new metering, although the seller is required to supply one. It is also quite common that customers throw out the user manual with the box, or put the CD away somewhere and then can’t find it. That’s why we and other Dorrough users keep a unique electronic library for Dorrough meterings, where you can use our link to download the user manual for the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A.

The user manual lists all of the functions of the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A, all the basic and advanced features and tells you how to use the metering. The manual also provides troubleshooting for common problems. Even greater detail is provided by the service manual, which is not typically shipped with the product, but which can often be downloaded from Dorrough service.

If you want to help expand our database, you can upload a link to this website to download a user manual or service manual, ideally in .pdf format. These pages are created by you – users of the Dorrough 400-A - Jumbo Analog Loudness Meter 400-A. User manuals are also available on the Dorrough website under Pro Audio - General Accessories - Metering.



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