Page 1: ...INSTRUCTION MANUAL FOR 1100 ELECTRONIC INSTRUMENT CO Inc 131 01 39th AVENUE FLUSHING 54 N Y ...
Page 2: ...DC VOLTMETER u O k Diagram ...
Page 3: ...00 000 cps to 200 Me The readings on the d c voltage ranges are accurate within 3 and on the a c ranges within 5 of ful l scale the multiplier resistors used are accu rate within 1 As the input impedance is 25 megohms on d c and 3 meg ohms on a c voltage ranges the current drawn by the instrument is negligible so there is no problem of error due to circuit loading A balanced bridge circuit maintai...
Page 4: ...to zero Plug the line cord into the 60 cycle 115 volt a c supply turn the power on with the ON OFF switch and a I low a normal warm up time about one minute Insert the phone plug PI on the DC test lead in the DC jack Jl on the panel Insert the pin plug P2 on the AC OHMS test lead in the AC OHMS jack J2 on the panel Insert the banana plug P3 on the COM MON test lead into the COMMON ground jack J3 o...
Page 5: ...10 1000 and 10 000 respectively and read in ohms on the RX1MEG range read the scale directly in megohms Note The small reading noted on the lowest range is the resistance of the leads CAUTION Never leave the FUNCTION switch set at the OHMS position as this will greatly shorten the life of the ohmmeter battery DECIBEL MEASUREMENT The instructions for decibel measurement are the same as for a c volt...
Page 6: ...e attenuation of wave traps in decibels can be determined by noting the decrease in decibels as the trap is tuned through resonance ZERO CENTER APPLICATIONS In some applications for example in align ing the discriminator in f m or a f c circuits it is convenient to use a zero center d c voltmeter because the d c output of the discriminator changes from to to as the secondary of the discriminator t...
Page 7: ...e voltage of a bias cell Current drawing voltmeters are not capable of making this meas urement and in many cases will damage the cell TELEVISION RECEIVER ADJUSTMENTS This instrument will measure the d c voltage developed across the second detector load resistor In the picture channel of a television receiver This measurement h most useful when adjusting an tenna orientation as we as when adjustin...
Page 8: ...ances between zero and 1000 meg ohms Decibel measurements between 20 and 55 db can be made using the DB scale D C AMPLIFIER CIRCUIT See Figures 1 and 3 A balanced bridge circuit is used in the d c amplifier comprising the twin triode V 2 a common plate load resistor R 3 and the balanced cathode load resistors R 10 R ll and R 12 The meter M l is connected across the two cathodes of V 2 In the norma...
Page 9: ...s connectors J 2 and J 3 The FUNCTION switch connects the range voltage divider and battery B l across J 2 and ground A voltage depending on the RANGE switch setting is then applied to the gridof the d c amplifier V 2A The remaining portion of the ohmmeter circuit follows the same pattern as the d c voltmeter circuit POWER SUPPLY See Figures 1 and 3 The operating potential for the d c amplifier V ...
Page 10: ...ate the DC n voltage ranges repeat the above steps with the FUNCTION switch set at DC and the positive end of the cells connected to the D C probe Adjust the DC calibration potentio meter R 27 NOTE The electrostatic pickup which appears on the lowa c and d c voltage ranges when either the AC OHMS or DC probe is held or touched is normal in a sensitive vacuum tube voltmeter due to the extreme sensi...
Page 11: ...e Voltmeter Radio News June 48 Mayo G Vacuum Tube Voltmeter for A C andD C Nov 43 Parket A T Get The Most From Your VTVM Radio Maint Apr 48 Rider J F Vacuum Tube Voltmeters J F Rider Publisher N Y N Y 51 Terman F E Measurements in Radio engineering 1st ed Me Graw Hi 1 Book Co N Y N Y 35 p 18 The Cxcittiite EICO Ifake jw4 Each EICO Kit and Instrument it doubly guaranteed by EICO ond your jobber to ...
Page 12: ...PLACEMENT please include the stock number of the part and serial number of your instrument T j V 3 6X5 POWER RECT R 9 5M 4 va o H 9 R 31 15M P t DC TEST LEAD H IO P 2 AC TEST LEAD H ll P 3 COMMON TEST LEAD Fig 3 Schematic Diagram ...
Page 13: ...H38 nut shldr washer 1 144 H39 nut washer 1 145 H40 6 fibre washer 2 146 J1 phone jack 1 147 J2 pin jack 1 148 J3 banana jack 1 149 Ml meter 1 150 PI phone plug 1 151 P2 pin plug 1 152 P3 banana plug 1 153 R1 10K ohm res 2W 1 154 R2 33K ohm res 2W 1 155 R3 20K ohm res 1 156 R4 1 5M ohm res 1 157 R5 2M ohm pot 1 156 R6 1 5M ohm res 1 158 R7 5M ohm res 1 159 R8 1M ohm res 1 St Sym Description Amt 15...
Page 14: ...e s Antiques and Collectables www StevetiJohnson com Vintage Technology Tube Radios and Test Equipment Schematics and Publications Thousands of vintage vacuum tube radio schematics hundreds of manufacturers ...
