4-1 2 digit lcd panel meter quotation

The Lascar DPM 300 is a 4 1/2 digit LCD voltmeter with 12.5 mm (0.5") digit height. It features 200 mV and 2 V DC full scale readings, auto-zero, auto-polarity and a set of annunciators. The meter plugs directly into a DIL socket or can be panel mounted using the snap-in bezel and window. Connection to the meter is via two rows of pins.

Applications The digital panel meters RISH DPM have been designed for industrial applications, which frequently require precise and on-site adjustment of the display range. It can be used in industrial automation and for laboratory uses. Features

XIELI Ltdhas been founded SINCE 1994, atbeginning she is a military products manufactuer, now has developed into a high & new technology enterprise which manufacture various digital panel meters for Civilian instrument & Military.

A man with one voltmeter knows his voltages. Perfectly. When, due to the pressures of circumstances, he acquires one more, he doesn"t, any longer. Each meter will have its own interpretation of the voltage presented to it, and this can cause confusion when relying upon them to perform critical tasks such as charging Li-Po batteries.

This instructable describes a Four-and-a-half digit voltmeter based on the MAX1498 ic from Maxim. It comes calibrated from the factory and all you need to do is to add the components to supply power to it, and to display the output from it.

With four and a half digits, this meter can display counts upto 19999, plus or minus. The "and half" part of the designation comes from the fact that the first display, used to indicate the sign (+ or -) can, without much effort, be used to display a "1" as well.

Since most multimeters used for servicing are of the three and a half digit variety this little circuit can be used to keep a bunch of them agreeing with each other.

The figure shows the pinout of the ic. Eight outputs for the seven segments and decimal point. Five outputs for the display cathodes. Five supply connections. Two inputs. A few digital inputs to control the behaviour of the chip. The data sheet will have the full details if you wish to probe further.

I printed out the pin diagram and drew the external connections in. Peak and hold inputs were held inactive. The internal reference was used. The decimal points were set to be displayed, and the 2V/ 200mV selection would be by an external switch.

The two analogue input pins are not soldered to the board. Two wires connect this to a separate piece of glass epoxy board which carries two 330 ohm resistors and 100n capacitors to ground. In addition, the neg input has been given a "static leak" via a 1Meg resistor. The chip will work from 2.7 V to 5.5V, so I intend to power it from three or four AA cells.

Finally, it works. In the pictures, it is displaying the voltage of a single dry cell and the display holds steady. As you can see, there is a change of just one count in that last digit.

I might be wrong, but I cannot find any reference to the 1498 being calibrated at the factory. You are using the internal voltage reference which can vary anywhere between 2.007V and 2.089 with 2.048 being the nominal voltage. I see that it has offset calibration but that can"t be confused as span calibration. If your reference voltage can vary +-2% then your measurements can off be 2%. This only gives you about 3 digits of accuracy

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