Power-down mode

The PWR DN command activates the power-down mode. In this mode, aU the analog blocks are switched-off reducing the power consumption from 20 mA (aU blocks of the chip are active, microhotplate at 300 °C) to 2 mA (only digital blocks are active). 

The performance of the temperature controller was measured in the tracking mode. Figure 6.18 shows a graph, where the temperature of one of the three microhotplates is kept at a constant temperature of 300 °C, the temperature of the second microhotplate is modulated using a sine wave of 10 mHz, while rectangular temperature steps of 150 °C, 200 °C, 250 °C, 300 °C, and 350 °C have been appHed to the third microhotplate. Temperature measurements on one of the hotplate that has been operated at constant temperature in the stabihzation mode showed a variation of less than 1 °C, even though the temperature of the neighboring hotplates was, at the same time, modulated dynamically (sine wave, ramp, steps). This is a consequence of the individual hotplate temperature control, without which thermal crosstalk between the hotplates would have been clearly detectable. The power dissipation of the chip is approximately 190 mW, when all three hotplates are simultaneously heated to 350 °C. In the power-down mode, the power consumption is reduced to 8.5 mW. 

In January 1967, N Reactor was shut down because its plutonium production capability was not needed, but in April 1967 DOE agreed to operate N Reactor solely in a power-production mode for supplying steam to HGP in response to electrical power needs in the Northwest. On June 21, 1967, a fire in the 109-N Steam Generator Building Cell 3 of the reactor resulted in a temporary shutdown. The N Reactor was restarted on July 21 of the same year. 

Four reduced power modes idle, sleep, power-down, and deep power-down. On-chip crystal oscillator with an operating range of 1-24 MHz. 

Electromagnetic Telemetry. The electromagnetic telemetry is usually powered downhole with batteries. Parameters such as gamma ray, resistivity and temperature, can be transmitted while tripping up or down. Since a two-way communication is possible, the system can be switched to a logging only mode to transmit only the logging information. 

Mossbauer spectra are usually recorded in transmission geometry, whereby the sample, representing the absorber, contains the stable Mossbauer isotope, i.e., it is not radioactive. A scheme of a typical spectrometer setup is depicted in Fig. 3.1. The radioactive Mossbauer source is attached to the electro-mechanical velocity transducer, or Mossbauer drive, which is moved in a controlled manner for the modulation of the emitted y-radiation by the Doppler effect. The Mossbauer drive is powered by the electronic drive control unit according to a reference voltage (Fr), provided by the digital function generator. Most Mossbauer spectrometers are operated in constant-acceleration mode, in which the drive velocity is linearly swept up and down, either in a saw-tooth or in a triangular mode. In either case. 

This is probably the best feature of digital scopes when it comes to troubleshooting switching power supplies. This is where they win hands down against analog scopes. This mode can be used to capture non-repetitive events such as... 

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