Sect.IV Page 12 Model 405C
SCHEMATIC DIAGRAM NOTES
1. Heavy box indicates front-panel engraving.
2. Arrows on potentiometers indicate clockwise rotation as viewed from the shaft end.
3. Resistance values in ohms, inductance in microhenries, and capacitance in picofarads unless
otherwise specified.
4. Relays shown in de-energized position.
5. * Adjusted at factory. Part may be omitted.
6. Voltages shown are for guidance; values may vary from those shown due to tube aging or normal
differences between instruments.
7. Voltages measured with an electronic voltmeter having an input resistancegreater than 100 meg-
ohms, with SAMPLING control set to EXT, and with no input voltage or triggering signal applied.
8. Where dual voltages are shown, the first occurs on positive ranges; the second on negative ranges.
9. indicates floating ground.
VOLTAGE AND RESISTANCE DIAGRAM NOTES
1. Each tube socket terminal is numbered and lettered to indicate the tube element and pin number,
as follows:
heater
cathode
grid nearest cathode Letter subscripts
2nd grid from cathode ! indicate section of
multi-section tubes.
3rd grid from cathode 1
1
heater mid-tap
internal shield
plate
shield
no external connection to socket
indefinite reading due to circuit (see 2)
The letter subscript to tube-element designators indicates the tube section.
2. Voltage values shown are for guidance; values may vary from those shown due to tube aging or
normal differences between instruments. Resistance values may vary considerably from those
shown when the circuit contains potentiometers, crystal diodes, or eleccrolytic capacitors.
3. Voltage measured at the terminal is shown above the line, resistance below the line; measure-
ments made with an electronic multimeter, from terminal to chassis ground unless otherwise noted.
4. Measurements made with SAMPLING control set to EXT and with no input voltage or triggering
signal applied.
00518-2 |
ACEC
