Dorrough Audio Video Meter

Dorrough AVM-R Audio Video Meter

Dorrough AVM-R Audio Video Meter

Dorrough Audio Video Meter

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  • 1Description

The Dorrough AVM-R provides an NTSC video level meter and dual analog audio meters for quick and easy checking of multimedia program levels at a glance. This model combines a 40-N video meter with two 12-A stereo meters in a 19" by 2RU panel, ideal for CATV headends. Nearly any demodulator with video and audio outputs provides the ability to scan through all channels quickly to verify or adjust video and audio levels.

Video Meter is a PAL/SECAM version of the Dorrough LM 40-N. It displays average and peak luminance, sync level, and blanking, allowing "Go/No-Go" decisions to be made at a glance. 75-ohm video connections to the VM-40 are made to BNC loopthrough connectors located on the back panel. A termination toggle switch is provided for single line connection. The meter is powered from a standard 120/240VAC outlet.

Professional Quality A/V Metering
The AVMR, is, like all Dorrough meters made for professionals who demand quality. The VW-40 Video Meter retains the familiar Dorrough "ergonomics". A single, gently arced 40-segment LED bar graph displays peak and average luminance and sync information in highly recognizable color-coded segments. The series 12-A audio meters integrate, on the same scale, two ballistics, showing the relationship between the average and the peak.
Large Display
Although the VM-40 is not designed to replace your waveform monitor, it will do some things the waveform monitor will not. Most obvious, you can't read your waveform monitor from 20 feet away. The large arched format of the audio loudness meter offers the same advantage.
Travels Easily
Whether in a production van with tight space or as a stand-alone, this three-meter combo fits and moves easily.
In the Box
Dorrough AVM-R Audio Video Meter
  • 2-Year Warranty
  • Table of Contents
    • 1Description
    Input Impedance 20k Ohm balanced, 10k Ohm single-ended, +/- 2%
    Display Resolution 40 LEDs, 1 dB/LED except model 60D, +/- 0.25 dB.
    Display Ballistics Peak and Average
    Frequency Response Not Specified by Manufacturer
    Sampling Rate Approximately 10 mS updates
    Scale Video: 30 LED segments over a range of 0 to 120 IRE units (4 IRE unit resolution)


    Audio: standard scale range of -25 to +14 dB,in 1dB units

    Calibration Controls Video: Not Specified by Manufacturer

    Audio: None Needed
    User Controls Video:  Not Specified by Manufacturer

    Audio: 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

    E) Auto ARMP
    User Port Video: BNC Connectors, 75-ohm video

    Audio: 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)
    Power Supply Input Range 117/237 VAC RMS, -20% to +10%, 50-60 Hz
    Connectors Video: BNC Connectors, 75-ohm video

    Audio: XLR left and right
    Dimensions (WxDxH) 19.0 x 8.0 x 3.0" (in) (7.5 x 3.1 x 1.2cm)
    Weight Not Specified by Manufacturer
    Packaging Infowrbrarvccvxatyuydxezrsfbvrdb
    Package Weight 4.15 lb
    Box Dimensions (LxWxH) 22.1 x 10.1 x 4.9"
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