Multimeter Lcd
2010
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 LCD Digital Testing Multimeter Voltmeter Ammeter DT830B $15.00 Time Remaining: 10d 11h 50m Buy It Now for only: $15.00 |
Multimeter Lcd
Choose the right Digital Multimeter
A Digital Multimeter is an electronic measuring instrument which combines several measurement functions in one unit. A Multimeter has various features such as it has the ability to measure current, resistance and voltage. Digital Multimeter usually displays digits but it may display length which is proportional to the quantity measured. Using it one can check the continuity of the circuit, diodes and transistors. The resolution of a digital Multimeter is specified in digits of resolution. Using it we can get accurate measurements.A signal under test is converted into voltage and an amplifier with controlled gain preconditions the signal.
A digital Multimeter displays the quantity which is measured as a number by eliminating the parallax errors. Nowadays Digital Multimeters are designed with embedded computer which provides a wealth of convenient features. It is very much useful for the electronic engineers, students and technicians. It can provide an auto ranging display for faster measurements. Digital Multimeter is used for the basic functions such as educational applications, residential and for automotive. It is designed with manual ranging such as capacitance and temperatures. It is also used for trouble shooting and electrical maintenance. Automotive can test duty cycles, switches, solenoids and alternator diodes.
With it one can make frequency, resistance, capacitance, current, voltage, temperature measurements and period with confidence. One can also monitor, view statistical values and record measurements to see the circuit's performance. Nowadays it is used for finding electrical current. In this type of Multimeter one can test AC, DC volt, resistance, batteries, electrical inductance, electrical capacitance, frequency, diodes and DC current. It is designed with LCD screen for easy understanding. Most of the Multimeters are used to measure electrical current and electrical voltage. Digital Multimeter offers digital number for unstable signals or quick-changing. Digital Multimeters are used by everyone for its accuracy and speed. Anyone who want to know the exact measurements and distance they can use Digital Multimeter.
Digital Multimeters are also made with various facilities such as Data hold, full icon display, low battery display, sleep mode, battery powered, transistor, continuity buzzer and diode function. Multimeters with streamline holster design, solid state protection, resistance mode, deluxe carrying case, manual and auto ranging, microcontroller based design, beep guard, overload protection, low voltage ohms, full function protection, metallic screen board with strong antimagnetic field and auto power off are also available in market.
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Can i use calculator's photovoltaic cell to charge AA batteries?
hi. the lcd of that calculator has just got damaged. so, i opened it and touched the two terminals of the photovoltaic panel with my multimeter, in diffused sunlight. the readings were:
1.48V 91uA
but this little current was used to charge the 1.5V 150mA alkaline button cell in the calc
now, can this photovoltaic panel be used to charge an AA NiCD or NiMh cell?
acatully, that button alkaline cell was rechargable- its Maxcell lr36(or sumthing...i forgot the exact model). iooked for that model no. in google- it is rechargable. so...what else can i do to use that solar cell? i took 2 such button cells(i have specified the voltage and current above) but still cant light an LED. any other creative ideas?
Most likely, that little solar cell was used to supplement or displace power from the alkaline cell, but never actually recharged the alkaline battery.
0.1 mA is not enough to charge a NiCD or NiMH. It is less than the leakage current of those batteries, assuming they lost 10% a week, that's like 150 mAh a week, or 1 mA per hour.
Even if you got a very low leakage battery, it would discharge through the cell at night. If you put a diode in series with the solar cell to block backwards-flowing current, then there won't be enough voltage available to still charge a battery.
The third consideration is whether the battery would charge in a reasonable time. Let's say that the battery is 1500 mAh. Then, if you could charge at 150 mA, you would need 10 hours of charging to get to capacity. That's 2 days, 5 hours of sun a day. In practice, it's worse than that because of inefficiencies. If the current is instead 0.1 mA, then the time is 15,000 hours - 3000 days, at 5 hours/day. Again, assuming zero losses.
The upshot of all this is that you really would need a larger panel to charge batteries.
EDIT: well, I stand corrected. I'm not sure what more could be done, though. If you can find an LM3909 chip somewhere, that's designed to flash an LED from a 1.5V battery. I don't know if that chip is still made.
B10096-DT9205A Digital LCD Display Multimeter
