поискавой системы для электроныых деталей |
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ES51982 датащи(PDF) 9 Page - Cyrustek corporation |
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ES51982 датащи(HTML) 9 Page - Cyrustek corporation |
9 / 21 page 11/01/05 9 ES51982 3 1/2 CAP AUTO DMM 1.7 Frequency counter The time base of the frequency counter is derived from an external crystal oscillator by Tcounter = 4000000 Fosc where fosc is the frequency of the crystal oscillator. Thus, the counter has a 1 second time base when a 4MHz oscillator is used. The frequency counter can select the proper range automatically or manually. Auto-range operation extends over five decades, from 2KHz to 20MHz The following table summarizes the full scale range of the frequency counter. Range Full Scale FR1 2.000KHz FR2 20.00KHz FR3 200.0KHz FR4 2.000MHz FR5 20.00MHz 1.8 Auto power off ES51982 has a default auto power off function. If the meter idles for more than 10 minutes, the chip automatically turns the power off. When this happens, the state of the meter is saved. In order to disable auto power off function, power on the meter when any of the push function, except for HOLD, is pressed down. In addition, when RS232 output is active, the auto power-off function is also disabled. The APO sign on the LCD panel indicates whether the auto power-off is enabled or not. Note: Powering on the meter while pressing HOLD turns on all LCD segment until HOLD is pressed again. 1.9 Sleep The meter enters sleep mode after auto power off. The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V) after re-power on. 1.10 Re-power on After auto power-off, pushing any of the push function or changing the rotary mode can turn on the meter again. If the meter is re-powered on by changing the rotary mode, the saved state is cleared. If the meter is re-powered on by push functions, the chip restores the saved state and enters HOLD mode. The LCD displays the saved value. |
Аналогичный номер детали - ES51982 |
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Аналогичное описание - ES51982 |
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