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SIEMENS & HALSKE
LAB PRECISION WATT - METER
Beside the contemporary F.-C. »COLUMBUS« (= 38 cm / 15" ) SlideRule
LAB PRECISION W A T T - M E T E R SIEMENS & HALSKE / Germany (1900)
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Width = 23 cm / 9" ; Depth = 32 cm / 12_1/2" ; Height = 12 cm / 4_3/4"
SCALE = 0 .. 150 SN = 2803243
= 1 kΩ ; 25 A ( 7 mΩ ; 20 μH ) / 50 A ( 1.7 mΩ ; 5 μH )
Results from T E S T S ( see below):
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MAXIMAL: ( DC / AC ) 1500 W = ( 300 V * 5 A ) ... ( 30 V * 50 A )
CALIBRATION FACTORS: » 25 A « = x5 / x10 = » 50 A «
VOLTAGE-INPUT on the BLACK CLAMPS ; the CURRENT-INPUT on BRASS CLAMPS.
The SWITCH on front changes the POLARITY for the instrument ; and the
SCREW above is for ZERO-ADJUST of the instrument. The BRIDGES have to
be set either to » 25 A « (shown) or to » 50 A «.
Have a Look at a home-made TEST-UNIT ...
Some T H E O R Y ...
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... adapted from O.MOHR "Elektrotechnik" (1961) Picture from "Kleine Enzyklopaedie" TECHNIK (1956) A Look I N S I D E ... |
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... and a F R O N T A L View shows the BRIDGING INSTRUCTION ...
T E S T I N G THE INSTRUMENT ...
Bridge to » 25 A «
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o 12 VDC / 18 W LAMP ===>> showed 3.5 on Scale
o 220 VAC / 25 W LAMP ===>> showed 5.0 on Scale
o 220 VAC / 40 W LAMP ===>> showed 8.0 on Scale
o 220 VAC / 60 W LAMP ===>> showed 12.2 on Scale
o 220 VAC / 100 W LAMP ===>> showed 20.0 on Scale
o 220 VAC / 200 W LAMP ===>> showed 40.0 on Scale
===>> CAL.FACTOR x5
Bridge to » 50 A « ==============
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o 220 VAC / 100 W LAMP ===>> showed 10.0 on Scale
o 220 VAC / 200 W LAMP ===>> showed 20.0 on Scale
o 220 VAC / 1000 W HEATER ===>> showed 105.5 on Scale
===>> CAL.FACTOR x10
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===>> The R A N G E of this Precision Instrument is 5 W ... 1500 W
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Maximal: ( DC / AC ) 1500 W = ( 30 V * 50 A ) ... ( 300 V * 5 A )