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Ballistic Galvanometer

Ballistic Galvanometer :

(ZES 137)

For measurement of small quantities of electrical charge. Reflecting mirror type model. The moving coil is suspended by a phosphor bronze strip, which carries an optically true concave mirror. The coil can be raised or lowered or set to zero by an adjusting knurled knob at the top. A knob at the back is provided for clamping and releasing the coil. A link high resistance is provided to make the galvanometer periodic, if desired, levelling screws are provided for balancing the coil.

 

TYPE RESISTANCE OF COIL PERIOD SENSITIVITY
(a) 100 ohms 10-12 sec. 180 mm
(b) 500 ohms 10-12 sec. 400 mm
 

D Arsonal Galvanometer :

(ZES 138)

Inexpensive but sensitive instrument for null detection. Bakelite case with tripod stand having one long foot for supporting the scale. Two levelling screws for balancing the coil. clamp and free arrangement for transportation. Fine zero adjuster at the top. 200 ohms resistance coil suspended with phosphor-bronze alloy suspension strip. Can be supplied with 50 cms focus concave mirror without scale for use with lamp and scale.

 

Spot Galvanometer :

(ZES 139)
Very popular for use as a null detector for potentiometric set-ups and bridges.
Housed in Bakelite case with lamp and scale arrangement. Taut band type
movement. Movement sufficiently protected against shocks. Alcomax magnet
properly aged for high stability.clamp 150 mm ;long, easy replacement for lamp.
Operated at mains 220 volts a.c. or 6 volts d.c. band switch for 5 shunt powers
1, 1/10, 1/100, 1/1000 and short circuit. Dimensions overall 220x225x132 mm approx.

RESISTANCE PERIOD DAMPING RESISTANCE
(a) 125 Ohms 2 Sec. 1000 ohms
(b) 600 Ohms 2 Sec. 7000 ohms
 

LAMP AND SCALE ARRANGEMENT :

(ZES 140)

Suitable for use with reflecting galvanometer Lamp housing is provided with universal adjustment in any direction and fitted with 6 volts lamp which is workable on 230 votls a.c. with the help of transformer stepdown provided in base duco finish or workable with 6 volts accumulator for this two terminals are provided on the base. To have quick and accurate focusing rack and pinion is provided. The universal lamp and scale is fitted on heavy base with chrome plated rod. Complete with Perspex scale calibrated in mm 250-0-250 mm and 0-500 mm. The scale carrier is the new improved design permitting lateral adjustment and provides full scale view over the entire length.

 

 
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