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LCD 4-and-a-half-digit voltmeter made with ICL7129

2013-07-19
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The main performance characteristics of the LCD 4-digit and a half digital voltmeter ICL7129 made by ICL7129: The full-scale measurement range is ±200.00mV (better than 7135!) and ±2.0000V. Within this range, the accuracy is ±1 word. Major improvements have been made to the integration circuit, using advanced technologies such as successive multiple integration and digital zeroing to ensure that the reading is \"0000\" when 0V input is input and no automatic zeroing capacitor is required (the highest bit is automatically blanked). When the basic range is selected as ±200.00mV, the resolution is as high as 10uV. The chips of the famous brand series such as DT930F, which are currently widely used, are ICL7129. The input impedance is higher than 109Ω, the input leakage current is only 1 pA (typical value), and differential input mode is allowed. (This meter head is input in common ground mode). It can automatically determine the polarity of the input signal and has a data retention function. There are multiple symbol control signal ports ANND (ANNUNCIATOR DIRVE). It uses LCD display, which is very power-saving. When powered by DC9V, the power consumption is only 9 mW. It flashes to indicate the over-range state. It uses a DC9V single power supply (battery) for power supply.

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