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FIELD MULTI-METER    » METRAVO «



Field  Multi-Meter   » METRAVO «      METRAWATT A.G. / Germany   (1960)
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Dimension ( W-D-H ) 85 mm x 118 mm x 42 mm  /  3_3/8" x 4_5/8" x 1_5/8"

DC/AC    Class 2     1.8 mA .. 6 A   /   6 V .. 600 V   /   0 .. 100 kΩ
DC                           100 μA  /   60 mV   /   0 .. 600 LUX-Scale
                                         <  Ri(I) = 30 Ω  at  1.8 mA  >

The USER's MANUAL  is made in the same size & shape as the instrument !
Ampere- & Volt-Scale are LOGARITHMIC (!)  It was a  "futuristic design"
in the '60s,  because it needs  NO BATTERY  for the resistance test: It
had a build-in  SOLAR-CELL  and it could also  be used as a  LUX-Meter. 

       

SORRY:  In 2011 the build-in SELEN CELL is dead  -  Made an EXPERIMENT:
Exchange the  SELEN CELL (left) with  a modern  SOLAR PANEL (right) ...

       

... It works!   0 Ω = full scale,   BUT:  OHM-CALIBRATION is different.


D A T A   SOLAR PANEL  ( in sun light )    U0  =  3 Volt  /  IK  =  1 mA
------------------------------------------------------------------------
For  SOLAR EXPERIMENTS use  ( + ) (   ) ( - )  JACKS  on the  right side

The  NEW  Ω - CALIBRATION  (= easy to remember !) ...

            0      .5      1       2      3     4    5   6
            |-------+------+-------+------+-----+----+---|
                200k   100k     50k    ...   25k  12k  0  Ω

                                            ===>>  400 x 6 = 2400 LUX

TEST as a LUX-Meter:  Shortcut the Ω Plugs, use Factor about ( x 400 )

!!  A T T E N T I O N  !!  A T T E N T I O N  !!  A T T E N T I O N  !!
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When opening the »METRAVO« be aware of LITTLE SPHERE & SPRING in front!

impressum:
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann       02/24/12