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Multimeter
Multimeter
How do I measure the voltage stored in a capacitor with a multimeter, but not discharge the capacitor?
I have a capacitor that stores EDL energy obtained from a particular chemical reaction. I need to calculate the amount of energy generated by the creation of a voltage vs. load graph capacitor and the search for your area. This means I have to keep constantly connected multimeter, but can not reduce the charge stored in capacitor EDL. How can I accomplish this? Thank you very much!
If the capacitor is small, and I believe this is from your comments, then you need special high impedance meter or amplifier. It's pretty easy to find OpAmps with inflows of 200 FA (AD8605 is one). At 10 volts, which is the resistance 5e13 equivalent or 50 ohms Teraohms. You can connect one of them as a voltage follower and connect the output to a normal multimeter. If 200 fA is not enough, then you need special equipment.
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Sinometer DT9205 Digital Multimeter Sale Price: $16.99  |
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Mastech Full Feature Digital Multimeter With Built-In SMT Technology The low cost full size professional level meter gives you great value, with capacitance measurement Rubberized Protective Cover Professional features: DCV:20mV/20V/200/V/1,000V ?0... |
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Digital Multimeter Sale Price: $5.99 |
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Black Digital Multimeter Features LCD display Tests transistor and diode Overload protection |
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602-070 Steren 3 1/2IN Dig Auto Range Multimeter Sale Price: $8.54 |
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5/8 High-contrast Lcd Display33-segment Fast Analog Bar Graphdiode And 50 Ohm Continuity Beeper |
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Mastech MS2138R Auto-Ranging True RMS AC/DC Clamp Meter List Price: $249.95 Sale Price: $99.99 |
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AC voltage: 4V-40V-400-600V RMS. DC Voltage: 4V-40V-400V-600V. DC Current: 0-400A-600A-1,000A. AC current: 0-400A-600A-1,000A RMS. Resistance: 400-4K-40K-400K-4M-40M Ohms. Frequency: 40Hz-400Hz-4KHz-100KHz... |
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NEW AC DC VOLT OHM DIGITAL MULTIMETER MULTITESTER METER List Price: $17.99 Sale Price: $3.99 |
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An ohm is a measure of resistance to the current flow of electrical circuits. One Ohm is the amount of resistance overcome by one volt in causing one ampere to flow. |
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602-270 Steren 3-3/4 Digit Auto- Range Multimeter Ac/dc List Price: $49.95 Sale Price: $23.77 |
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Tests AC/DC voltage and current resistance capacitance and frequency 3 3/4 digit DMM Transistor tester and diode-continuity beeperIncludes 9v battery and 3 double-insulated test leadsShipping package dimensions: 2... |
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SE Digital Multimeter with Light, Big Screen List Price: $12.75 Sale Price: $12.75 |
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Regularly $9.97 - Color might vary. Measures AC Voltage, DC Voltage, DC Current, Resistance, Transistor Test, Square Wave Voltage, and Diode Test. LCD Display. 0.5 percent basic accuracy. Uses one 9V battery, which might or might not be included... |
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P3 International P4400 Kill A Watt Electricity Usage Monitor List Price: $52.43 Sale Price: Too low to display |
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Kill A Watt can help you reduce your power bill. Kill A Watt will help find power-wasting appliances then you decide whether it is worth keeping them plugged in. For standard 115 VAC appliances only, 15 Amps maximum, 125 VAC maximum. |
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19-Range Analog Multimeter List Price: $25.99 Sale Price: $24.10 |
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Compact 7-function, 19-range analog tester, for testing AC/DC voltage to 1000 volt, DC current to 10 amp, resistance to 10 Meg. decibels from -8 to +62dB. Audible continuity, battery testing of 1.5 and 9 volt, manual range selection of 500 mA and 10 amp fuses... |
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Extech EX411 True RMS Manual Ranging Digital Multimeter with Type K Remote Probe Thermometer List Price: $69.99 Sale Price: $69.99 |
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Includes: CAT III test leads; Multi-position tilt stand and hanging strap; Protective holster with test lead holder; Bead wire temperature probe; 9V battery |
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WOLF-Garten 3226004 Push-Pull Weeder List Price: $15.97 Sale Price: $14.99 |
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The WOLF-Garten push-pull weeder allows gardener's to quickly change tools in one-click, eliminates the need for having a garage full of unsightly, and space consuming long-handled tools. The push-pull weeder works by simply working the blade back and forth below the soil level... |
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SE Digital Multimeter with Back Light, Lg. LCD Display, 0.5% List Price: $23.85 Sale Price: $14.56 |
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Digital Multimeter 3-1/2 digit LCD electrical multimeter with a max reading of 1999. Measures (5) ranges of DC, (2) ranges of AC voltage both to 500 V, (5) ranges of resistance to 200K ohms, DC current to 10 Amp... |
How To Use A Multimeter
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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Triplett 630-A Multimeter (Antique) $19.99 |
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DIGITAL LCD MULTIMETER NEW! $0.50 |
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Vintage Multimeter AC/DC Volt Ohm Meter AVOMETER 8 Mk2 $20.00 |
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mac tools EM710 AUTOMOTIVE MULTIMETER $51.00 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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LCD Multimeter Voltmeter Ammeter Ohmmeter Tester Tool $0.99 |
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Innova Hands-Free™ Digital Multimeter (10 MegOhm) 3300 $25.99 |
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HVAC 600A Auto Digital Clamp Multi Meter Duty/Freq/Temp $9.99 |
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DIGITAL MULTI-METER AC DC VOLTAGE CURRENT CABLE TESTER $9.99 |
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FLUKE 87-V 87V TRUE RMS DIGITAL MULTIMETER TEMPERATURE $275.00 |
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LCD VOLT METER MULTIMETER AMPS AC DC DIGITAL VOLTMETER $1.52 |
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Keithley 191 5.5 Digit Digital Multimeter $100.00 |
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Fluke 81438 True RMS Multimeter $124.99 |
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AC DC CLAMP Meter Digital Multimeter Electronic Tester $0.99 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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Fluke 8024B Multimeter Parts $8.50 |
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True AC/DC Clamp On Digital Multimeter Meter Amp Tester $0.99 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $9.98 |
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NEW FLUKE 117 TRUE RMS ELECTRICIAN MULTIMETER NEWINBOX $129.99 |
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HP 403B-001 Multimeter VOM PARTS or REPAIR $20.00 |
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Tektronix DMM 254 Multimeter $149.00 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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True AC/DC Clamp On Digital Multimeter Meter Amp Tester $0.99 |
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LCD DMM Digital Multimeter Electronic Measure Tools New $0.78 |
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Fluke i410 Current Clamp Multimeter Accessory AC/DC New $57.66 |
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Keithley 168 Digital Multimeter $75.00 |
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Keithley 169 Digital Multimeter $75.00 |
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AC/DC Digital Voltmeter Ammeter Ohm Multimeter Tester $1.00 |
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Digital Clamp MultiMeter Meter Tester 1000A w/Frequency $19.99 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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Sperry ADM 28 Automotive Multimeter $26.01 |
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Electric Multimeter AC DC Ohm VOLT Meter VOM Tester $1.99 |
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DIGITAL LCD VOLT OHM MULTIMETER TESTER BATTERIES PROBE $0.99 |
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Amprobe Digital Clamp-On Multimeter, Model# ACD-14FX $119.99 |
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Digital Multimeter Electronic Tester AC/DC CLAMP Meter $3.30 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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LCD DIGITAL VOLT AMPS Ohm METER MULTIMETER AMPS AC DC b $0.99 |
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FLUKE 17B MULTIMETER w/ AC/DC/Diode/R/F/Temp/Cap NEW US $99.99 |
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LCD Pocket AC/DC digital multimeter Volt Ohm Amp Tester $0.99 |
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Digital Voltmeter Ammeter Ohm Multimeter AC/DC Tester Y $1.49 |
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USM-223 U.S. NAVY MULTIMETER TESTER PHAOSTRON $15.00 |
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LCD Digital Multimeter AC DC VOLTAGE Electronic Meter $6.99 |
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LCD Pocket AC/DC digital multimeter Volt Ohm Amp Tester $6.88 |
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Digital AC/DC Voltmeter Ammeter Ohm Tester Multimeter $5.27 |
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FLUKE 87-5 TRUE RMS MULTIMETER !!!! Barely Used $155.01 |
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New AC/DC OHM Voltmeter Ammeter Multimeter Multi Tester $0.94 |
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LCD DMM AC Digital Multimeter Electronic Measure Tools $0.91 |
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DIGITAL MULTI-METER AC DC VOLTAGE CURRENT CABLE TESTER $9.99 |
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blue point multimeter mt594a $30.00 |
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BLUE-POINT MT454A AUTOMATIC DIGITAL MULTIMETER W/ LEADS $39.99 |
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Digital Multimeter Tester $8.95 |
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AC DC CLAMP Meter Digital Multimeter Electronic Tester $0.99 |
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New Digital LCD Multimeter + 2 Test Leads Repair Tool $0.99 |
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LCD Digital Multimeter AC DC VOLTAGE Electronic Meter $16.63 |
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Digital LCD Multimeter Voltmeter Ohmmeter Ammeter OHM $0.01 |
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LCD Digital Clamp Multimeter AC DC Volt Tester Tool $0.99 |
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FLUKE 87 v TRUE RMS MULTIMETER Temperature 87v 87-5 $147.50 |
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AC/DC Multimeter Electronic Tester DIGITAL CLAMP Meter $1.00 |
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LCD Digital Multimeter Electronic Voltmeter Ammeter AC $0.78 |
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My Dell Notebook uses a power adapter that has an output voltage of 16V at 4.5A current. One day the adapter stopped working.
I decided to try to repair the adapter. In the past I repaired several switching power supplies of PCs and also one AC-power adapter of a Asus notebook. I found out that most of the supplies had similar defects. Often they are ease to locate and to repair.
This Instructable shows how to repair a Dell Notebook AC-Adapter but using the same principles it can work with any switching power supply.
1?Things needed AND SAFETY
First of all you need the defective power supply … The you need a screw driver. It could be phillips type or a flat blade type, depending on the power supply.In case of the Dell Notebook adapter you need a Dremel tool and a cutting disc too.To find out the dead parts you need a multimeter that contain…
2?Opening the case
The Dell Notebook AC-Adapter (Dell Inspiron E1505 AC Adapter) is not meant to be opened. The case is made of two plastic frames pressed together and melted at the contact to one piece. To take it apart you need to cut the two halfes using a Dremel tool and a cutting disc. WAIT SOME MINUTES AFTER PULLING THE POWER CHORD FOR THE CAPACITORS…
3?Examining and understanding …
Start locating the parts of the power supply. We concentrate only on a few parts. I often found out that these are the most critical parts. Most swicth mode power supplies die when being switched on. At that moment a high current flows on the primary power side. You can see that if you plug in th…
4?The Fuse
Start with the fuse. Turn you multimeter to diode test (continuity test) and put the test cables on both ends of the fuse. The multimeter should “beep” and show a very low voltage (Dell Inspiron 1501 AC Adapter). If that is the case the fuse is ok and need not be replaced. Otherwise you have to desolder the…
5?The Rectifier
Next part in the chain is the rectifier. In nearly all cases I saw til today there is a full bridge rectifier used. Here it is a flat one located near the power connector. Again use the diode test for measurement. From underneath the printed circuit board you can reach the rectifiers contacts ea…
6?The Capacitor
Now use our Multimeter in diode mode to find out if the capacitor works. Place the measuring pins on the pins of the capacitor and look at the display while doing that. As soon as you place the pins the display shows 0V. Then the voltage in the display starts growing and the display shows infini…
7?Repairing
After we found out what went wrong we can repair the power supply. If the capacitor is broken, desolder and replace it. I tried to find out if this was the only defect part and decided to do further testing before trying to buy a replacement. I did not have the capacitor that was used in the pow…
About the Author:
Udtek.com delivers high quality laptop batteries, laptop AC adapters, Laptop keyboards, Lcd chargers, DVD drivers, Scooter chargers and more. Our unique product lines of over 1000 diverse accessory power products and replacement batteries and adapters provide our customers with an extensive selection of the best quality products available.
Article Source: ArticlesBase.com - Repairing a Dell Notebook AC-Adapter
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WOLF-Garten 3226004 Push-Pull Weeder $14.99 The WOLF-Garten push-pull weeder allows gardener's to quickly change tools in one-click, eliminates the need for having a garage full of unsightly, and space consuming long-handled tools. The push-pull weeder works by simply working the blade back and forth below the soil level. Wavy dual-edged blades cut through the soil effortlessly, while self sharpening with each use. The weeder features side ... |
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SE Digital Multimeter with Back Light, Lg. LCD Display, 0.5% $14.56 Digital Multimeter 3-1/2 digit LCD electrical multimeter with a max reading of 1999. Measures (5) ranges of DC, (2) ranges of AC voltage both to 500 V, (5) ranges of resistance to 200K ohms, DC current to 10 Amp., diode test, transistor and battery test. A pocket sized 2-7/8" x 5-3/4" x 1-1/2", it comes complete with test leads and 9 volt battery. The best value for this size we have seen.... |
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WOLF-Garten 2906004 Interlocken Trowel $10.59 The WOLF-Garten interlocken trowel is a versatile tool, ideal for both small and larger gardens. It has a strong, heavy gauge steel blade. The trowel requires one of the WOLF-Garten Multi-Star handles -- it works with a long handle for stand-up digging, or a short handle for closer work. It is part of the WOLF-Garten Multi-Star Interlocking Tool System, which allows gardeners to quickly change too... |
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Electrical/Electronic Fundamentals Volume 7 Digital Multimeters-Testing Procedures 1413-6 ... |
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