. Rare and Ancient Equipment calstan 223 user manual free download

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INSTRUCTIONS FOR OPERATING CALSTAN MODEL 223 COMBINED TUBE CHECKER AND MULTITESTER The CALSTAN combined tube checker and multi-tester is literally a universal instrument, its application being extremely simple. Its main uses are:- TO TEST The efficiency of valves. Milliamps D.C. .5 ranges. Shorts and leakage in valves. Volts D.C. ...5 ranges. Electrolytic condensers. Volts A.C. ...5 ranges. Dry type (static condensers). Ohms. ...5 ranges. EQUIPMENT:- 1 pr. top cap wires, 1 pr. test prods. BATTERIES:- 3 No. 3678 Eveready, 1 U2 Eveready. These batteries should be replaced when the ohms scales can no longer be brought to full scale. They may be easily removed by slackening the screws holding the metal clamps. OPERATION:- THE OPERATOR SHOULD READ THESE INSTRUCTIONS VERY CAREFULLY IF COMPLICATIONS ARE TO BE AVOIDED. TUBE CHECKER PORTION:- Before a valve is tested it is necessary to check the line volts in order to register a faithful test. The reason for this test is because of the possible variation of the line above or below its rated voltage. A toggle switch is provided to change the application of the instrument from (200-220) to (230-250) volt lines. The test selector switch should be turned to the position marked VALVES and the main selector switch turned to the position marked L (line). On switching on the current the meter needle will deflect in close proximity to the arrow on the GOOD-BAD scale. The pri. adjust should now be rotated until the needle is as close as possible to the arrow. The instrument is now ready for use. SHORTS-LEAKAGE:- Before a valve is tested for efficiency it is necessary for shorts or leakage. The operator's attention is strongly drawn to this precaution as shorted elements will cause the meter to become overloaded. Any valve which does not pass this test should be classed as faulty. Turn the main selector switch to the S (shorts) position and set the filament volts switch at its lowest setting and rotate the element selector switch slowly over its entire range. Tap the valve sharply during this operation as loose elements are a common fault. If any shorts are present a definite glow will be seen in the neon. A sharp glow may be seen when rotating the switches but as this is due to a condensor discharge it may be disregarded. A good idea of the nature of the short may be gaind from the intensity of the glow. A very low resistance short will be indicated by a brilliant glow. A faint glow indicates a high resistance short. In the case of most valves a very faint glow may be disregarded as this is quite normal. The numbers on the switch correspond to the system of numbering with 3 and 4 as heaters in each case. N0.2 is plate in most cases and 1 screen etc. As an example a glow on 8 and 2 denotes a short between top cap electrode and plate. A glow on one point only indicates a short between t