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Multimeter--fuse looks fine--new battery--values changing not correct, tried voltage on 9v, 12v and house current. is the unit faulty?

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The quickest way to destroy your multimeter is to hit a hot wire with the switch in the ohm position. I have a stack of them in the shop, all blown out the same way. I just go out and buy another cheapie. Because I know what is going to happen to it. Hope this helps.

Posted on Aug 31, 2010

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My 1996 Oldsmobile cutlass supreme is having issues keeping charge. It won't stay running and will start only with jumper cables. As it dies all my lights in the car dim till they are not visible anym


i would try the battery drain test , disconnect the earth terminal and place an ampmeter between the battery earth pole and the battery earth cable if the read out is more than 30-50 milli amps then start looking for what or where the drain is from , as it drains so quickly i'd think it would be a high wattage user ie ignition system , so pulling the fuse's until the milli amps drop will tell you what the component is , also pull relays as one or more may be open all the time even when not required , keep me posted if you wish

Nov 15, 2014 | Cars & Trucks

Tip

How to test your AC/DC Adapter or Computer Power Supply Unit.


A PSU or Power Supply Unit aka AC/DC adpater is then means by which a low tension (voltage) appliance receives its power from the 240 AV mains supply, the this is usually accompanied by the nominal current that is drawn from the PSU on load in milliamps. (e.g. 500mAmps = 0.5 Amps) most modern DC adapters are unregulated, where the output voltage is only regulated by the load current, and a smoothing Capacitor is sometimes used to reduce AC ripple on the DC Level.
If the PSU is regulated the DC Voltage that you measure using an AVO even off load will be the same as the rated current.

Also most, not all, are double insulated (indicated by small square inside a larger one) this means that it doesn't need a earth on the plug, the give away is a plastic pin instead of a metal one found in most domestic plugs with a 13A fuse.

Using Ohms Law P= I x V means that we can find out either the Current in Amps Power in Watts or the Voltage of any unit this is also called the VA rating

The Simple test is if the adapter gets really hot as soon as the you apply AC power then this may indicate catastrophic failure OR a dead short and you must turn OFF immediately the plastic may even start to melt, you may also smell electrical burning. This will also happen if you ever use a non-specific adapter on your device that has a different output voltage this will almost certianly cause damage to your device.

The main test if to test the step-down transformer using an AVO (Amps Volts Ohms) this is what is used to reduce the 240V ~AC voltage to something more in line with the required DC supply say 14-16V ~AC, a diode bridge converts this to DC, if it is regualted there will be either and either a zener or resistor drops this to the rated 12V and a capacitor to smooth the level.
You need to make sure this is socket is working correctly by checking with either a lamp electricians screw driver or a AC test plug, dont use this socket you have an earth fault or someother problem, usually two lines at the outside of a AC socket tester means all is correct.
  1. First measure the resistance (Ohms) across the two AC pins that is the Live and Neutral this should have VERY low resistance in the range 300 to 2,000 (2K) Ohms. if this is the case then your primary winding is probably OK if you see 1 on all settings this means open circuit (O/C)
  2. Then connect the power supply to a 240V AC socket, and check the output voltage with multimeter set at volts DC you should see a stable voltage of the rated value for a regulated adapter or slightly higher by about 5% if its unregulated as this is a reading off load, if you were able to test the voltage with the adapter on load you would see the rated DC voltage.
  3. If you connect an unregulated AC/DC adapter to the device and open up the cover to test it under load and the voltage is low around 5V or less then the adapter will need replacing even if the off load value appears correct in above test ( ** ref the table below)
NOTE: If you have a AC only output then the test done in 1 can also be done, if there is a diode bridge, Zener Dicde OR Capacitor on the secondary this test wont work so you might have to remove the cover by unscrewing the tamper-proof screws and test it before the connection to the PCB, without the power on of course, check out my tip HERE for help on how to remove the screws.

If you have a faulty power supply its usually the thermal fuse that blows on the secondary winding, this means that you will get considerably less Voltage at the output jack of around 5 VDC or less and falling if this is the case the transformer is faulty and will need to be replaced with one of the same step-down ratio. OR you will need a new AC/DC Adapter, check out this table for examples of the results that you might find.

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** The Amstrad Black PSU that reports 24V and 383 Ohms on the primary may still not deliver the rated voltage under load and therefore I have marked this as a false positive and therefore FAULTY.

NOTE: The AC/DC Chargers are constant current devices (the symbol is usually two interlocking circles and even though you can do similar tests on the transformer primary coil its the current that it delivers under load that is important the only way to test this is using a clamp meter on the cable to see the current under load this should match the rated current.

COMPUTER ATX PSU

Most ATX power supplies are known as switched mode can only be tested under load when connected to the PC motherboard this is a bit tricky using a plain old Fluke, AVO or Multimeter the best way is to buy dedicated PSU tester for the type of Power Unit you have, it will check the DC voltages in the range + 12V,-12V,+5V,+5VBs and +3.3V on both the SATA and IDE supply cables these cost about £20 ($35) you can test the unit in as little as 5 mins.

on May 11, 2010 | Computers & Internet

1 Answer

Itower speaker system won't turn on


Hi Peter,

1.power switch.
2.power transformer .
3.fuse (if have)
4.rectifier (dc cct)
5.input voltage to transformer.220v ac or 110v ac.
6.output voltage from transformer .(low ac value 12v 9v 7.5v....)
7.voltage in smoothing capacitor.according to transformer voltage 12v,7.5v etc....
power switch and switching power.

regards,
nuwan

Jan 27, 2014 | Apple Soundlogic Itower Speaker Works W/...

1 Answer

How to hook up the battery to Best Power UPS Model ME1.4kVA ? I have an used Best Power UPS Model ME1.4kVA without battery. I opened the case and find three wires as below: A. one each short #2 wire goes...


You are correct the Positive (+) is the fuse and the other two (orange in my unit) wires both go to the negative (-). Also your battery should be at least 12V 75AH dry cell with a holding voltage of 14V when charged, a standard battery will not work, the unit will boil it dry. This will give a 5 min run time at 75% load (115V 9A continuous).

I changed the units configuration to use a 12V 750AH wet cell by changing its holding voltage to 13V, adjustable on the charging board (the outer most board when the cover is off that is). By doing this the battery costs about $75 not $140 and I get a run time of 4 hours 30 min. at 75% load. My entire office is floating on this unit. Also this unit will require a house current voltage of 105V-125V on a 15A breaker. Yes house current varies all the time by +-10 volts. and unit will use about 10A when running at 75% and charging. The normal output at full load for this unit: 115V 11A. continuous, ( the computers in my office pull 7A to 9A when they are in use, idling at 4A when not in use. So when the power fails I just keep working.

Another thing to note with the new configuration for a wet cell battery, monitoring software will initially show a low run time of 3 to 5 min., but after the unit runs for about a minute on battery the software will adjust to the real run time. So set low battery shutdown for about 2min and the software will work fine.

Ok a little background about the 1.4KVA Battery Backup from Best Power Tech. When I purchased this unit some time ago, it carried a double lifetime warranty good up to $250,000. Not bad for a $2,000 unit. What that meant was not only would the equipment protected by the unit survive a hit, but the unit will also. So far this unit has handled 17 blackouts, over 40,000 line spikes (Voltage greater than 125) and over 3,000 brownouts (Voltage less than 105) and maintained a constant 115 Volt output. (Sub note here the unit beeps while a brownout is in progress, because the battery is being used to help maintain Voltage.) Also this is the same model used at the Kitt Peak Observatory in Arizona. I was encouraged to call and talk to them about the unit, very impressive track record!

Ray
No Budget Productions

Feb 10, 2011 | Powerware Best Power Fortress UPS System

1 Answer

I have a mastech digiter multimeter It shows only continuty only beep but not shows any AC or DC voltage or current rating after adjust the correct poit of rotary knobe, There is no any hold...


This multimeter measures the voltages this way - the voltage is reduced by the rotary knob to a small value then it's transformed in frequency by an autooscillator - that frequency is measured, In your case the oscillator has failed. It can't be fixed - the oscillator is in the measuring chip. It's dead, buy a new one.

Oct 17, 2010 | Computers & Internet

2 Answers

Our online UPS is giving only about 204-206 volts, instead of 240. I changed the batteries, but the output voltage hasnt changed. What could be the problem? Could you suggest some things I can try?


oh that voltage is ok if you are measuring voltage by digital multimeter then it shows wrong value measure voltage by anologue multimeter it will show 240v correctly dont suspect on measured voltage

Feb 27, 2010 | APC Symmetra RM 2 kVA UPS System

1 Answer

I need a fuse diagram for 2001 Nissan Pathfinder


Do you want to install a new unit or wht ? u may use this reference to work upon ....
Get yourself a digital multimeter. Find the +12V constant, 12V remote, and ground. Connect them to the new head unit. For speaker wire get yourself a 9V toy battery and listen to poping noise. If you have a factory amp you need to power up the factory amp. Use the wiring diagram below to serve as a guide. Test your wire first before connecting them.


NISSAN
P o w e r
Memory (+12v Constant) Red
Ignition (+12v Switched) (varies) Brown or Green
Ground (-) Black (varies - most don't have one)
Illumination Red/White
Dimmer Red/Black
Power Antenna Green
S p e a k e r s
Right Front (+) Brown
Right Front (-) Brown/White
Left Front (+) Black
Left Front (-) Black/White
Right Rear (+) Blue
Right Rear (-) Pink
Left Rear (+) Red
Left Rear (-) Green

Feb 04, 2010 | 2001 Nissan Pathfinder

1 Answer

Checking batteries


I assume a "DM-350a" is some kind of a digital multimeter. I Googled and found it might be a "A.W. Sperry DM350A 5 Function 17 Range Digital Multimeter" and looking at the ranges available on that meter, you can't really thest the battery "under load" the only reasonable way to test small batteries. the DC current only goes up to 200 milli amperes. A "C" or "D" size flashlight battery puts out 1 to 4 amps depending on conditions. That's 5 to 20 times the current readable by that meter. The volts on one of those batteries is probably 1.6 volts to 1.3 volts etc. If you live in the United States, I'd say go to Radio Shack and spend $5 to $15 and buy a battery tester like "Enercell Analog 9-Range Battery Checker, $14.99, Model 22-156, catalog # 22-156"
Then you and anyone in your family can read the instructions and test 8 or 9 different type batteries. Battery types: 1.5V button-cells, "AAA"/"N"/"AA"/"C"/"D", 6V, 9V, 12V, 15V and 22.5V..
This is not supposed to be an advertizement, and I have no interest in RadioShack,... but it's supposed to be instructional.

Small price, Good instruction to anyone who can read, and if anyone forgets, they can re-read. Testing a lot of batteries in a sitting goes very fast with these.

Differently, with the sperry, or any voltmeter, you'd have to select a resistor small enough to draw the current, and large enough not to overheat or burn, connect it and measure the loaded voltage drop, compare the voltage and current of the loaded battery, and compare it to that of a new battery, and a battery you might consider too weak for your application.. Voltage equals amps times resistance, and power equals amps squared times resistance... Really, buy a battery tester.
Regards --- GooseBay_Camper

Sep 26, 2009 | Sperry Instruments HST401 Voltage...

1 Answer

I have a apc 650 model bk650mus battery backup. when power is cut the battery doesn't seem to work. (no power coming from the apc unit. i thought i just needed a new battery but i pulled it out of the...


how long the lifespam is the battery you had are using it? if you check the voltage that is 13.5dcv but it could be the Ah is already running low.. try to change with a new batts and power up the ups ifi it not workin that mean it the hardware issue..

Mar 23, 2009 | APC Computers & Internet

1 Answer

Audiovox PVD80


The UK has a standard mains voltage supply of 220 to 240 v AC. So you need a 240 v in to 12v DC out regulated power supply, probably require a secondary current of 2.5 amps. Just be careful that the connector polarity is wired correctly. Farnel /cpc sell the adaptor linked below in the uk [phone to order- pay by credit card] which looks good value and will probably do the job:

Link to power supply

Please rate my assistance - I hope it has been useful.

Dave ...London UK

Mar 20, 2008 | Televison & Video

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