Switches single pole

Schematic diagrams for radio-frequency (r.f.) electronics are shown in Fig. 5.2. The circuit in Fig. 5.2(a) is a simple heterodyne circuit. The pulse length is defined by the switch SI. The speed of this switch determines the minimum pulse length, and hence the minimum lens focal length, and hence the highest frequency of the microscope thus the limit to the resolution is ultimately determined by the highest useful speed of this switch. S2 is the single-pole-double-throw (s.p.d.t.) switch, and Al the low-noise preamplifier. The mixer is a device that takes two inputs, the radio-frequency signal and the...

Pressure switches are used to energize and de-energize electrical circuits when the process pressure reaches their set points. The standard switch contact configurations are shown in Figure 3.143. The contacts are designated as normally open (N/O) and normally closed (N/C). In case of a single-pole double-throw (SPDT) switch, as the process pressure reaches the set point, the N/C contact opens and the common (C) side of the switch is closed to the contact designated as N/O. 

Some of the standard arrangements include the single-pole single-throw (SPST), single-pole double-throw (SPDT), and the double-pole double-throw (DPDT) designs, but units are available with up to four poles. These switches... 

For small U and C values, the discharge resistor may be permanently connected to the capacitor. In the example given above, the resulting power loss would be 10 kW. Consequently, a discharge switch shall be fitted which automatically closes the discharge circuit. For pressurized apparatus, a single-pole vacuum tube (contactor type) may be used. Its open position is achieved by a pneumatically actuated drive, the closed position should be maintained by the atmospheric air pressure, and, if necessary, by an additional helical spring. 

Fig. 1-36. Reflux-ratio timer. Ri, 3-megohm potentiometer R , 250,000-ohm J-watt Ra, 1-megohm potentiometer Rt, 50,000-ohm -watt Ci, 4-mfd. paper, 400 volts Cl, 2-mfd. paper, 400 volts Ct, C<, 8-mfd. electrolytic, 250 volts Vt, Fa, 117L7/M7GT Ry 1, Ry 2, double-pole double-throw relays, 1,000— 4,000-ohm coil Pi, Pa, 115-volt pilot lights X, standard receptacle (output) Si, Sa, single-pole single-throw switches. (Courtesy of Dr. H. Fischer and Analytical Chemistry.)...

Fig. 2-10. Wheotstone-bridge circuit for thermistors. Ri, 1,0000 wire wound Rj, 1,OOCO wire wound Ri, 2,0000 10-turn Helipot R4, 2,OOCO R3, 5,0000 Re, 10,0000 Di, thermistor having 500—2,0000 resistance at operating tenpsrsture Si, single-pole four-position switch (sensitivity control) M, 0—25/sa met, or hotter, e galvanometer, with about a 2,0000 interne resistance.

Fig. 4-6. Detector circuits for vapor-phase chromatography, (a) Thermistor detector Di, D=, Victory Eng. Corp. 32A12 thermistors Ri, Ri, 1,0000 wire wound resistors Rz, 1,0000 Helipot Rt, 10,0000 1% carbon film resistor Rs, 5,0000 1 % carbon film resistor Rt, Rj, 2,5000 1 % carbon film resistor Sw, single-pole four-position switch, (b) Hot-wire detector Rz, filament current control, to adjust filament current between 150—300 ma ( 20 ohm 5w) Ri, R4, reference detectors Rs, R, sample detectors Re, zero control 20 Re, 600 1 % carbon film resistor R, 300 1 /, carbon film resistor R, 150 1% carbon film resistor Rse, 7.5Q 1 % carbon film resistor Rs, 7.SCI 1 % carbon film resistor M, 300 ma meter,- S, single-pole six-position sv/itch.

The first two components in the detection assembly, a high-power PIN diode and a single-pole switch are required to protect later circuit elements from the high-power microwave polarizing pulse. The leakage peak power from the diode is still too high for the low noise amplifier used to amplify the rotational FID, so the microwave switch is placed after the diode. This switch is controlled by the same pulse that activates the TWTA pulse output. 

The B, D DR F Reactors presently have a single pole double throw switch whose contacts are sunnad Into Individual rows hy single row relays Ihesa systems are scheduled to he changed to he standard with the C and H system concept hy about July 196U. 

A double-pole disconnect device (switch, breaker, other) should be used and should disconnect both poles simultaneously. In some products a single-pole device may be allowed to disconnect only the phase conductor when the neutral can be verified, but this is often not possible since plugs are reversible in many EU countries, such as in Germany. Parts that remain live after the disconnect device is opened (OFF) shall be guarded against accidental contact by service personnel and a warning label is necessary adjacent to the hazard areas. 

Single-pole, one-way switch Note Number of switches at one point may be indicated... 

Figure 9 A single-pole electron transfer switch. Light-induced isomerization and electron transfer processes in triad 7.

The ordinary type of relay is an electromagnet that operates a switch. Many kinds of switch can be used, including the "SPDT" (see Index to find explanation in an earlier chapter), which is shown in Fig. 12.1. In this course, the inexpensive relay that is recommended is a "DPDT," but its full capabilities will not be exploited, and it will just be operated in the single pole mode. 

Pig. 4.5 Simple circuit showing two identical and independent (redundant) capacitor/resistor paths in an electronic circuit with a load, two ceU battery (in series), a fuse and a single pole double throw (SPOT switch. 

EIA-520aaad Detail Specification for Single Pole, Single Throw, Surface Mount Pushbutton Switches... 

An electrical signal is generated by an RF tone-burst source. In the beginning, a Colpitts oscillator, or the like, was used as the RF tone-burst source. Nowadays, however, burst waves are gated out from continuous waves by a single pole double throw switch for frequency stability. The output (i.e., voltage) of the source is approximately 10 V... 

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