Question about Mbt ZTS Inc. Mini-MBT, Mini Multi-Battery Tester for More than 15 Different Bat

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Why should the voltmeter be connected in parallel n ammeter connected in series with respect to the component in the circuit

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  • Wayne Mineard
    Wayne Mineard May 11, 2010

    Because if you connect an ammeter in parallel with a component, you are actually creating another branch, thereby reducing the actual current through the component.

  • Gordon Meredith
    Gordon Meredith Jun 14, 2014

    If you connect an ammeter in parallel you are creating a low resistance current path around the component your trying to test. Your tester has a low resistance so you dont effect the current flowing through the component your trying to test. When a current tester is in parallel, it is a dead short, and you will probably burn out your tester.

  • Gordon Meredith
    Gordon Meredith Jun 14, 2014

    A voltage tester is connectect in series so you can test the voltage dropped across the component in question.Voltage in volts equals the current through the component in amps times the resistance of the component in amps.If you know the resistance of the component, and the voltage across it you dont need to use a ammeter to find the current.Just devide the voltage by the resistance.

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Think of electricity as water and an ammeter as measuring the volume of water and a voltermeter as measuring the pressure


Posted on Feb 06, 2009

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How to use


Voltage testers and volt meters are two different things. A meter will provide a an indication of the exact voltage and type AC or DC. A tester on the other hand simply provides an indication of presence of power with little to no indication of how much or type.

AC power is what is provided by most power companies in the world. DC is a type of power provided by batteries and DC power supplies. If your tester or meter has provisions to check for AC and DC, you should check for BOTH. If AC power is present and you are have set your meter to test for DC power, your meter will indicate 0 volts. You can see this can be a dangerous condition. Most simple testers will not care if AC or DC power is being tested and the types that use neon lamps will usually glow differently for AC and DC power.

When setting up for testing voltage, you must test across the power source (or in "parallel") or load (such as a light bulb), as opposed to "in series" with the power source. Across would be from the + to - post of a battery, into the slots of an outlet, etc. "In series" is when the tester would be completing a circuit - such as testing across an open switch.

First, check the meter's operation by testing a known good power source by following the next steps. Set the meter for the type power to be tested. Choose AC if unsure. Next, set the meter for the highest voltage range supported. Make sure this range is higher than the expected voltage, otherwise damage to the meter may result. Connect the probes to the power source. Read the meter. If the meter moved only slightly, adjust the range of the meter to the next lower value. You can keep adjusting downward as needed to get the most precise reading possible - but do not set the range to a value less than the voltage present. A 0-300 volt scale is the lowest to measure a 240 volt outlet - switching to a 0 - 150 volt scale will damage the meter. The 0 - 150 volt scale would be fine for measuring 120 volt outlets.

If the meter did not move, change the type from AC to DC. and repeat. If it still does not work, the meter is not working correctly (if testing a know good source) or there is no power present (if the meter worked on a known good power source).

Good luck!

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1 Answer

A voltmeter should be connected in a series with a component?


A Voltmeter is connected in parallel with a component because in voltage mode it has a high impedance and measures the voltage drop across the component being tested and does not affect any parts of the circuit.
An Ammeter on the other hand is connected in series with a component because in current mode it has a low impedance and measures the actual current through the component being tested

Nov 20, 2010 | Mbt ZTS Inc. Mini-MBT, Mini Multi-Battery...

1 Answer

My vehicle is drawing power while off,


Common things are stuck trunk light or hood light.

Remove fuses for these and the radio and see if one of those might be the cause. Alarms are another common culprit.

One can put an ammeter in series with a battery lead to monitor while checking... DO NOT try to start however as you will blow the meter.

A very small current is normal for the radio clock and the engine/system computer memory.

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1 Answer

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Try these steps:

Attach your voltmeter to the battery terminal (re-positive and black-negative for most 12v systems) Start the vehicle.

Bring the engine RPM up to around 12-to 1500. Turn the lighhts on and put them on bright. Observe the voltage reading. It should be around 13.6 to 14.6, give or take a little.

If it reads 12v or less the alternator isn't charging. This usually means a defective voltage regulator or bad alternator (assuming the drive belt is tight). If you do get the correct reading on the voltmeter indicating the alternator is charging, then it's the battery.

It sounds more like the alternator or voltage regulator from your description and that the charging light is on. You can also check the condition if you have a scan tool. An OBD II code should be set if there is an issue with the electrical system.

One more thing - some systems may have a circuit breaker, fusible link or a fuse - check that too.

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1 Answer

Why must voltmeter be connected in parallel w/ circuit component


When connected in parallel it reads the voltage drop across said component.
When connected in series the current flows thru the meter allowing the measurement of the current flowing thru circuit.
Hope that helps.

Jan 04, 2009 | Mbt ZTS Inc. Mini-MBT, Mini Multi-Battery...

1 Answer

Why must be a voltmeter be connected in parallel with the circuit component?


to check voltage or Resistance that's the way it has to ne.
it is only used in series when checking amperage.
usually not over any circuit over 10 amps; depending on the
manufacturers ratings of your meter.
Paul

Jan 04, 2009 | Mbt ZTS Inc. Mini-MBT, Mini Multi-Battery...

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