1171. Photo Cell Characteristics Apparatus
Specifications:
A variable D. C. Power Supply is fitted with two meters to read D. C. voltage applied to the Photo Tube, and second meter is provided to read the current. Complete circuit diagram is engraved on the front panel.

1172. Photo Cell
Selenium characteristic curve apparatus.

1173. Plank's Constant Apparatus
The Instrument is provided with complete circuit diagram for estimation of plank constant. Power supply is built in provided with Micro ammeter and voltmeter to read the current and voltage. Set of three filters are provided. Photocell vaccum tube 868 or its equivalent is used. Provided with D. C. Amplifier. Terminals are provided for connecting 6.3 volts Bell or buzzer.

1174. Thyratron Characteristics' Apparatus
To study the ionisation potential of thyraton valve (Control characteristic) it consists of three meters to read Anode voltage, Anode current and Grid Bias. Provided with two power supplies of its own, with circuit diagram and instruction manual. Graph is ploted between Grid Bias and Anode voltage.

Battery Eliminators
These can be used with AC supply in place of DC Batteries.

1175. Battery Eliminator
Output 2,4,6,8,10,12V, DC, 1 Amp.

1176. Battery Eliminator
Output 2, 4, 6, 8, 10 12V DC, 2 Amps.

1177. Battery Eliminator
Output 2, 4, 6, 8, 10, 12 V DC, 3 Amps.

1178. Battery Eliminator
Output 2, 4, 6V., DC 3 Amps.

1180. V. T. V. M. (Vacuum Tube Voltmeter)

Specification:
A.C. Voltage:0-1.5, 5,15, 50,150,500, 1500 V.
D.C. Voltage: 0-1.5, 5,15, 50,150, 500,1500 V.
Positive or negative by selecting the position of the switch.

Resistance : 0-1, 10K, 100K, 1 M, 10M, 100M.
1000 meg ohms.

d BM : Alternating current of the unit 1 m W represents 0 dB. d Bm has two ranges on direct current 1.5 V and 15 V and when the terminating impedence is 600 ohms these ranges are -20 ± 6dB and 5± 24 dB.

terminating impedence is 600 ohms these ranges are -20 ± 6dB and 5± 24 dB.

Calibration Accuracy : A. C. Voltage ± 2 % on all ranges.
D. C. Voltage : ± 2% on all ranges.
Resistance within ± 3% on all ranges.
d BM within ± 0.5 dB.

Frequency Response : : Within range of 30c/s to 5Mc/s flat.

Input Impedence : D. C. for voltage: 11 M ohms on all ranges for A. C. Voltage: 5M ohms in parallel with 25 p F.

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