Deflection galvanometer

Procedure. Pipette 25.0 mL of the thiosulphate solution into the titration cell e.g. a 150mL Pyrex beaker. Insert two similar platinum wire or foil electrodes into the cell and connect to the apparatus of Fig. 16.17. Apply 0.10 volt across the electrodes. Adjust the range of the micro-ammeter to obtain full-scale deflection for a current of 10-25 milliamperes. Stir the solution with a magnetic stirrer. Add the iodine solution from a 5 mL semimicro burette slowly in the usual manner and read the current (galvanometer deflection) after each addition of the titrant. When the current begins to increase, stop the addition then add the titrant by small increments of 0.05 or 0.10 mL. Plot the titration graph, evaluate the end point, and calculate the concentration of the thiosulphate solution. It will be found that the current is fairly constant until the end point is approached and increases rapidly beyond. 

Fill a test-tube with the sample to be determined to a depth similar to that used for the standards, and insert into the instrument. Note the galvanometer deflection evaluate the concentration from the calibration curve. 

From Eq. (7), it is clear that the recorder indication A, a galvanometer deflection for instance, is proportional to 6,... 

Sample flow rates and dilution factors when olfactometer runs correctly and percentage deviation when galvanometer reads full scale deflection... 

During operation, it was difficult to obtain steady null readings on the galvanometer, particularly when the sample flow rates were small. In some positions, small movements of the control valve caused a full scale deflection (FSD) of the galvanometer while in other areas, movement of the valve in the same direction caused the flow to increase and decrease alternately. Fig. 3 shows the variation of flow rate with valve position, within... 

Galvonogroph. The photographic record of a sensitive galvanometer arranged so that the mirror deflects a beam of light onto a moving film or paper... 

The Pt electrodes should be placed right below the butet tip. This makes it. easier to see when when the endpoint is approaching, because the local excess of KFR s cause momentary deflections of the galvanometer... 

The balanced bridge circuit (Figure 10) uses a galvanometer to compare the RTD resistance with that of a fixed resistor. The galvanometer uses a pointer that deflects on either side of zero when the resistance of the arms is not equal. The resistance of the slide wire is adjusted until the galvanometer indicates zero. The value of the slide resistance is then used to determine the temperature of the system being monitored. 

All measurements were taken directly from galvanometer deflections of the transmitted light using for each setting of the spectrometer four similar cells mounted on a sliding track,—one empty, one filled with ethyl bromide and one filled with ethyl iodide. In this way the direct comparison between the bromide and iodide was rendered free from errors of the spectrometer. All... 

Astatic galvanometer -> Galvanoscope with two magnetic needles connected to each other with opposite polarity and only one of the needles is subjected to the metal coil through which a current flows. The two needles have zero net deflection in the magnetic field of the earth, and hence the measured deflection depends only on the magnitude of the current and is not affected by the magnetic field of the earth. The instrument was invented by - Kelvin. 

Differential galvanometer — Historic amperemeter where a small magnetic needle is placed between two metal coils that can be connected to two current sources. The needle deflection depended on the difference of currents. 

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