Assessments - 3, GPA: 3.3
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Facilidade de uso
Replace the battery when the “Lo Batt” indicator shows in the display. Long life alkaline batteries are available from Fluke Biomedical. Any standard 9 V alkaline battery can be used in the Digital X-Ray Pulse Counter/Timer. To replace the battery, slide open the battery compartment on the bottom of the case. Remove the old battery, and install the new battery. Operation General Instructions Section 2 Operation 2.1 General Instructions Switch Settings The front panel selector/toggle switch on the Digital X-Ray Pulse Counter/Timer has three positions: “OFF”, “PULSE” and “MILLISEC”. The switch is OFF when in the center position. OFF All power to the instrument is disconnected in the “OFF” position. Set the switch to “OFF” when not in use, to conserve battery life. The center position is OFF. PULSE When the switch is moved to the “PULSE” position, the instrument will be used for measuring output pulses from half-wave or full-wave rectified machines as well as AC line voltage pulses. Normally, each full second of exposure will produce 60 pulses. An exposure of 2/10 second will read 12, for example. MILLISEC With the switch in the “MILLISEC” position, the instrument will measure the length of time that a DC or 3phase AC x-ray is on. The display reading will be in milliseconds; i.e., an exposure of 1 second will read 1000; an exposure of 2/10 second will read 200. Connections When reading directly from an x-ray head, no connections are made to the instrument. Point the x-ray head at the “target” area of the instrument (near the lower left side of the instrument). Take an exposure and read the time on the display in pulses or milliseconds. Oscilloscope Output A jack labeled “scope” located on the left side of the instrument is the oscilloscope output. It allows the user to connect the instrument to an oscilloscope, so that x-ray waveform can be observed. This connector takes a standard 2.5 mm mono phone plug. Remote Sensor To use the Remote Sensor (optional), connect the plug at the end of the remote sensor cable into the jack labeled “remote” located on the left side of the Digital X-Ray Pulse Counter/Timer. Point the x-ray head at the target on the Remote Sensor. Stretch the cable out and use as described above. Nuclear Associates 07-453 Operators Manual AC Input Connect the two test leads to the two input jacks on the front of the instrument. Since the instrument counts AC pulses, the AC line must be switched by the relay that is in the timer under test. The circuit for AC inputs is completely isolated from the rest of the instrument. No damage to the instrument will occur if the probes are reversed. However, to obtain the best accuracy, the “+” (red) should be connected to the high side of the line, and the black or “-“ probe should be connected to the low side of the line. 2.2 Oscilloscope Output The Digital X-Ray Pulse Counter/Timer can be, and usually is, used without an oscilloscope, but the scope output feature enables technical analysis of the x-ray output. X-ray generators often have characteristics such as gradual rise times, variations in amplitude, noise, capacitive filtering, and extended decay times. Problems with x-rays can often be diagnosed by observing the output waveform of an x-ray with an oscilloscope. Plug in a standard 2.5 mm mono phone plug into the jack and attach the leads of the scope probe to the phone plug terminals. Set the vertical sensitivity of the scope to 1 V per cm. The scope waveform will be an amplified version of the actual output of the x-ray detector. A cable with a phone plug and a BNC connector for a scope is available from Fluke Biomedical (Model 88-453). The 2.5 mm mono phone plug is available from many vendors including Mouser Electronics, (P/N 177PP053). The Remote Sensor available from Fluke Biomedical (Model 07-453-2000) is particularly useful when observing the x-ray output using an oscilloscope. (Blank Page) Fluke Biomedical Radiation Management Services 6045 Cochran Road Cleveland, Ohio 44139 440.498.2564 ...
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