AvoMeter (AVO Meter) 8 Mk. 7

AVO Ltd.; London

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  • Year
  • 1995–2008 ??
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 341277

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Wave bands
  • - without
  • Power type and voltage
  • Dry Batteries / 1.5 & 15 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • from Radiomuseum.org
  • Model: AvoMeter 8 Mk. 7 - AVO Ltd.; London
  • Dimensions (WHD)
  • 167 x 192 x 115 mm / 6.6 x 7.6 x 4.5 inch
  • Notes

  • The Avometer Model 8 Mk.7 was the final version of the Avometer and ceased production on 16 October 2008. It was manufactured by Megger Group Limited.

    DESCRIPTION

    The Model 8 Mk. 7 is a general-purpose, portable, analog multimeter for the measurement of voltage, current, and resistance.

    The 20,000 Ω/V DC sensitivity matches data given in many service manuals for electronic equipment. The traditional appearance, with the two-switch range selection, is retained but the Model 8 Mk 7 utilizes modern technology in its design to give the high performance specified.

    The instrument circuit incorporates a 10 A ceramic HBC fuse in series with the COMMON terminal to give the user increased protection, should a connection be made to a high-energy source while the range switches are incorrectly set.

    The range switch identification has colour coding to help in the correct selection and the off position selects heavy damping of the meter movement for transit purposes.

    The left-hand switch provides all the DC current and voltage ranges and the right-hand switch provides the AC current and voltage ranges plus the resistance ranges.

    These switches are electrically interlocked so that reading can only be made after AC or DC  measurement and range have been selected.

    Resistance tests require the lefthand switch to be set to Ω and the right-hand one to the desired range. Wide coverage in resistance measurement has been achieved by having a fundamental range as marked on the scale, together with ranges of Ω x 100 and Ω x 10 k to supplement it.

    Each resistance range has its own zero adjustment control.

    When the instrument is set for DC measurement, the moving-coil meter is associated with a universal shunt and series multipliers; whilst on AC diodes and a transformer are introduced.

    The meter has a robust centre-pole movement with 37.5 μA full-scale deflection.
    A knife-edge pointer and a mirror arc enable very fine readings to be taken and avoid parallax errors. The whole movement is balanced and damped so that the pointer quickly comes to rest. For current and voltage measurement, the 0 to 10 scale has 100 divisions and the 0 to 3 scale has 60 divisions.

    The sensitive cutout, with very positive latching action, is triggered by the meter movement itself when overloaded.

    The cutout is reset by a push button. The deflection of the meter movement can be reversed simply by pressing a second pushbutton; thus, the multi-meter can respond to a negative polarity of the measurements.

    Several accessories are available to extend the measuring ranges and functions of the instrument.

    The complete series of Avometer 8’s;

    Mk. 1 c1951
    Mk. 2 c1956
    Mk. 3 c1964
    Mk. 4 c1970
    Mk. 5 c1972
    Mk. 6 c1987

  • Net weight (2.2 lb = 1 kg)
  • 2.2 kg / 4 lb 13.5 oz (4.846 lb)
  • Mentioned in
  • - - Manufacturers Literature (Megger Model 8 mk7 Analogue Multimeter brochure)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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