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Microamperes Stock Photos and Images

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Microamperes Stock Photos and Images

Dials measuring Kilo Watt Hours of electricity used. Stock Photo
RMB8GY1J–Dials measuring Kilo Watt Hours of electricity used.
Current meter Stock Photo
RMAANRBP–Current meter
Dials measuring Kilo Watt Hours of electricity used. Stock Photo
RMB8GY0E–Dials measuring Kilo Watt Hours of electricity used.
. Some experiments with coupled high-frequency circuits . croscope, a current of i milliampere is readilyreadable. The constancy is all that could be desired. See Electrical World, Vol.XLIX, 1907, p. 308. 3o6 Bulletin of the Bureau of Standards [Vol. 7, No. 2 portionality between the galvanometer deflections of a constantanplatinum thermoelement already calibrated and those of the tel-lurium-platinum element. The 32-ohm thermoelement with the most sensitive galva-nometer gave a deflection of about i mm for 120 microamperes. 4. THE CONTACT RECTIFIER For measuring still smaller oscillatory curre Stock Photo
RM2CRKCNP–. Some experiments with coupled high-frequency circuits . croscope, a current of i milliampere is readilyreadable. The constancy is all that could be desired. See Electrical World, Vol.XLIX, 1907, p. 308. 3o6 Bulletin of the Bureau of Standards [Vol. 7, No. 2 portionality between the galvanometer deflections of a constantanplatinum thermoelement already calibrated and those of the tel-lurium-platinum element. The 32-ohm thermoelement with the most sensitive galva-nometer gave a deflection of about i mm for 120 microamperes. 4. THE CONTACT RECTIFIER For measuring still smaller oscillatory curre
. Practical wireless telegraphy; a complete text book for students of radio communication . than 3 volts the flow ofcurrent (in microamperes) through the local circuit is relatively weak. The result of thisis seen to be a series of positive maxima of gradually decreasing amplitude to whichthe telephone diaphragm cannot respond individually but which produce an average effectin the receiver. The average current in the case of Fig. 157a may be considered for mereillustration to be 9 microamperes and the difference between the normal current 6 micro-amperes and the average current 9 microamperes Stock Photo
RM2CRKT6C–. Practical wireless telegraphy; a complete text book for students of radio communication . than 3 volts the flow ofcurrent (in microamperes) through the local circuit is relatively weak. The result of thisis seen to be a series of positive maxima of gradually decreasing amplitude to whichthe telephone diaphragm cannot respond individually but which produce an average effectin the receiver. The average current in the case of Fig. 157a may be considered for mereillustration to be 9 microamperes and the difference between the normal current 6 micro-amperes and the average current 9 microamperes
. The principles underlying radio communication . in Fig. 272. As theamplitude of the oscillations in grid voltage is increased to 0.5volts, the plate current decreases to 480 microamperes, then to420 microamperes at 1.0 volt, etc. This curve was taken with acondenser (C in Fig. 269) of 250 micromicrofarads and a leakresistance of 2 megohms. The operating point, or steady gridvoltage, about which the potential of the grid was caused to os-cillate by the incoming signal, was +0.8 volts, corresponding tothe point eo in Fig. 272. The tubes generally supplied to the Signal Corps for receiving(type Stock Photo
RM2CRM4TG–. The principles underlying radio communication . in Fig. 272. As theamplitude of the oscillations in grid voltage is increased to 0.5volts, the plate current decreases to 480 microamperes, then to420 microamperes at 1.0 volt, etc. This curve was taken with acondenser (C in Fig. 269) of 250 micromicrofarads and a leakresistance of 2 megohms. The operating point, or steady gridvoltage, about which the potential of the grid was caused to os-cillate by the incoming signal, was +0.8 volts, corresponding tothe point eo in Fig. 272. The tubes generally supplied to the Signal Corps for receiving(type
. The principles underlying radio communication . in Fig. 272. As theamplitude of the oscillations in grid voltage is increased to 0.5volts, the plate current decreases to 480 microamperes, then to420 microamperes at 1.0 volt, etc. This curve was taken with acondenser (O in Fig. 269) of 250 micromicrofarads and a leakresistance of 2 megohms. The operating point, or steady gridvoltage, about which the potential of the grid was caused to os-cillate by the incoming signal, was +0.8 volts, corresponding tothe point e0 in Fig. 272. The tubes generally supplied to the Signal Corps for receiving(type Stock Photo
RM2CRM2T1–. The principles underlying radio communication . in Fig. 272. As theamplitude of the oscillations in grid voltage is increased to 0.5volts, the plate current decreases to 480 microamperes, then to420 microamperes at 1.0 volt, etc. This curve was taken with acondenser (O in Fig. 269) of 250 micromicrofarads and a leakresistance of 2 megohms. The operating point, or steady gridvoltage, about which the potential of the grid was caused to os-cillate by the incoming signal, was +0.8 volts, corresponding tothe point e0 in Fig. 272. The tubes generally supplied to the Signal Corps for receiving(type
. QST . connected in series with the load. The full-scalepower values (three ranges are provided for) maybe set by adjusting R2, R3 and 7^4. However, anactual power calil)ration is not at all necessaryto the operation of the Z-match, since thebridge will serve quite well both for adjustmentof coupling and for relative power indicationswithout calibration. The meter used in the bridge has a basic move-ment of 0-200 microamperes, and in this case ahand-calibrated scale was made by taking theoriginal meter plate off and reversing it. Thethree scales were then hand-painted on, as thel)hotograph sh Stock Photo
RM2CRKXTR–. QST . connected in series with the load. The full-scalepower values (three ranges are provided for) maybe set by adjusting R2, R3 and 7^4. However, anactual power calil)ration is not at all necessaryto the operation of the Z-match, since thebridge will serve quite well both for adjustmentof coupling and for relative power indicationswithout calibration. The meter used in the bridge has a basic move-ment of 0-200 microamperes, and in this case ahand-calibrated scale was made by taking theoriginal meter plate off and reversing it. Thethree scales were then hand-painted on, as thel)hotograph sh
. The Bell System technical journal . Fig. 19 — Equivalent circuit of voltage comparator. TRANSISTOR CIRCUITS FOR ANALOG AND DIGITAL SYSTEMS 325 0.7 )O> 0.6 R, = 30,000 OHMS 20°C > u:o.5 o 0.3. 2 3 4 5 6 DIODE CURRENT, Ip, IN MICROAMPERES Fig. 20 — Volt-ampere characteristic of a silicon junction diode. mentally it is found that Yh-e for germanium junction transistors variesby about 20 millivolts throughout the temperature range of 20°C to40°C. Consequently, the variation in Yi at which the circuit switches is±5 millivolts. It is apparent from Fig. 20 that the accuracy of the comparator Stock Photo
RM2CRW5W1–. The Bell System technical journal . Fig. 19 — Equivalent circuit of voltage comparator. TRANSISTOR CIRCUITS FOR ANALOG AND DIGITAL SYSTEMS 325 0.7 )O> 0.6 R, = 30,000 OHMS 20°C > u:o.5 o 0.3. 2 3 4 5 6 DIODE CURRENT, Ip, IN MICROAMPERES Fig. 20 — Volt-ampere characteristic of a silicon junction diode. mentally it is found that Yh-e for germanium junction transistors variesby about 20 millivolts throughout the temperature range of 20°C to40°C. Consequently, the variation in Yi at which the circuit switches is±5 millivolts. It is apparent from Fig. 20 that the accuracy of the comparator
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. THE CATHODE RAY OSCILLOGRAPH 17 of the tube. In the 224 tube, with argon at the pressure of .01 mm. the focusing occurs at about 20 microamperes in the beam. Less cur- rent makes a large unfocused spot; more current produces a focus before the screen is reached, with consequent spreading of the spot again. Hence it is that the spot on the fluorescent screen is focused by adjusting the heating current of the cathode.. Fig. 21—General Electric, 1928." Besides focusi Stock Photo
RMRHWTKX–. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. THE CATHODE RAY OSCILLOGRAPH 17 of the tube. In the 224 tube, with argon at the pressure of .01 mm. the focusing occurs at about 20 microamperes in the beam. Less cur- rent makes a large unfocused spot; more current produces a focus before the screen is reached, with consequent spreading of the spot again. Hence it is that the spot on the fluorescent screen is focused by adjusting the heating current of the cathode.. Fig. 21—General Electric, 1928." Besides focusi
. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CjESIUM-OXYGEN-SILVER photoelectric cell 347 5 3 e C) o DIAMETER CORRESPONDING TO TEN MICROAMPERES PER LUMEN o C) OOO o c o 10 26 30 14 18 22 OXYGEN TO CAESIUM RATIO Fig. 5—Integral sensitivity as a function of ratio and weight of caesium chromate for a 15-minute heat treatment.. 18 22 OXYGEN TO CAESIUM RATIO Fig. 6—Integral s :nsitivity as a function of ratio and weight of caesium chromate for a 30-minute heat treatment.. Please note that these images are extracted fr Stock Photo
RMRHWPKT–. The Bell System technical journal. Telecommunication; Electric engineering; Communication; Electronics; Science; Technology. CjESIUM-OXYGEN-SILVER photoelectric cell 347 5 3 e C) o DIAMETER CORRESPONDING TO TEN MICROAMPERES PER LUMEN o C) OOO o c o 10 26 30 14 18 22 OXYGEN TO CAESIUM RATIO Fig. 5—Integral sensitivity as a function of ratio and weight of caesium chromate for a 15-minute heat treatment.. 18 22 OXYGEN TO CAESIUM RATIO Fig. 6—Integral s :nsitivity as a function of ratio and weight of caesium chromate for a 30-minute heat treatment.. Please note that these images are extracted fr
. Boletin de la Sociedad de Biología de Concepción. Sociedad de Biología de Concepción; Biology; Biology. ñámente más lenta. Cuando los valores del cociente E2/E1 eran cercanos o iguales a la unidad (acomodación negativa) se en- contró una respuesta rítmica a la estimulación única y al mis- mo tiempo hubo un marcado descenso de los umbrales, expresa- dos en microamperes. En el músculo sin inervación los umbra- les oscilaron alrededor de 91 ± 21[iA; en cambio en el lado nor- mal los umbrales eran cercanos a los 250 ± 10.5^aA. Estas cifras difieren significativamente entre si (P < 0.01). b) M Stock Photo
RMRHGP9M–. Boletin de la Sociedad de Biología de Concepción. Sociedad de Biología de Concepción; Biology; Biology. ñámente más lenta. Cuando los valores del cociente E2/E1 eran cercanos o iguales a la unidad (acomodación negativa) se en- contró una respuesta rítmica a la estimulación única y al mis- mo tiempo hubo un marcado descenso de los umbrales, expresa- dos en microamperes. En el músculo sin inervación los umbra- les oscilaron alrededor de 91 ± 21[iA; en cambio en el lado nor- mal los umbrales eran cercanos a los 250 ± 10.5^aA. Estas cifras difieren significativamente entre si (P < 0.01). b) M
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