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When measuring resistance a reading of ol on the dmm indicates?
Wiki User
∙ 10y ago
probably overload. which means whatever is being measured is beyond the range of the current scale.
Wiki User
∙ 10y ago
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How does a Digital Multi-Meter or DMM measure resistance?
A DMM measures resistance by passing a known current through the object you are measuring and reads the voltage. You can then calculate the resistance using the equation V=I*R. R=V/I So for 1mA and a return voltage of 1V the resistance must = 1 KOhm. R= 1/0.001 = 1000 Ohm
What is the input resistance of an ideal current-measuring DMM?
First of all, DMM stands for Digital Multimeter. The -multi implies the meter measures several different parameters, usually voltage, current, resistance, and sometimes other things such as frequency. The input characteristics of a DMM will be very different depending on the parameter selected. For current, the ideal meter would have zero input resistance. Since the ammeter is inserted in series with the circuit under test, any resistance will alter the measured current, introducing error in the measurement.
How does the technique for measuring current with DMM differ from measuring voltage?
current is measured with the meter in series and voltage is measured with the meter in parallel of the load
What is The appropriate EST for performing a resistance test on a potentiometer-type TPS isolated from its circuit?
DMM
How do you measure IGBT?
Digital multi-meter (DMM) test procedure:Equipment Requirement - DMM with diode check mode and battery voltage less than 20V. (Typical units using 9V battery are OK).Collector-Emitter Junction test: With the module out of circuit remove the conductive foam and short the gate to emitter.With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.Gate Oxide test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.
How does a Digital Multi-Meter or DMM measure resistance?
A DMM measures resistance by passing a known current through the object you are measuring and reads the voltage. You can then calculate the resistance using the equation V=I*R. R=V/I So for 1mA and a return voltage of 1V the resistance must = 1 KOhm. R= 1/0.001 = 1000 Ohm
What is the input resistance of an ideal current-measuring DMM?
First of all, DMM stands for Digital Multimeter. The -multi implies the meter measures several different parameters, usually voltage, current, resistance, and sometimes other things such as frequency. The input characteristics of a DMM will be very different depending on the parameter selected. For current, the ideal meter would have zero input resistance. Since the ammeter is inserted in series with the circuit under test, any resistance will alter the measured current, introducing error in the measurement.
How does the technique for measuring current with DMM differ from measuring voltage?
current is measured with the meter in series and voltage is measured with the meter in parallel of the load
What is The appropriate EST for performing a resistance test on a potentiometer-type TPS isolated from its circuit?
DMM
What scale must a dmm have to measure current in a circuit?
ohms law babe voltage,current & resistance
What games have DMM?
PSP games do not have the power for DMM PSP games do not have the power for DMM
How do you test Resistance Capacitance diodes and transistors on cathode ray oscilloscope?
It is always better to remove a component from the circuit for proper testing but most of the time a resistor can be tested with a DMM set to the appropriate ohm scale, the same with a diode where the DMM is set to diode setting. A transistor is more complicated, you first have to find the base connector and with your DMM set to diode, NPN Transistor, with negative probe to the base and positive to emitter or collector the smallest reading will be the collector and the slightly higher reading will be the emitter, no reading mean that it can be a PNP transistor then you will need to swap your probes, still no reading or a very low reading will mean the transistor is damaged In actuality tektronics do make a curve tracer oscilloscope to test active components . But the speed is very limited. So while it may tell you that the part is good or bad it will not tell you how good or how bad it will function in the actual circuit
How do you measure IGBT?
Digital multi-meter (DMM) test procedure:Equipment Requirement - DMM with diode check mode and battery voltage less than 20V. (Typical units using 9V battery are OK).Collector-Emitter Junction test: With the module out of circuit remove the conductive foam and short the gate to emitter.With DMM in diode check mode, the collector to emitter should give a normal diode reading with positive on the emitter and negative on the collector.The DMM should read open or infinite with positive on the collector and negative on the emitter. Damaged IGBTs may test as shorted in both positive and negative directions, open in both directions, or resistive in both directions.Gate Oxide test: With the DMM in resistance mode the resistance from gate to collector and gate to emitter should read infinite on a good device. A damaged device may be shorted or have resistive leakage from gate to collector and/or emitter.
How do you measure resistance with angle of potentiometer?
get a protractor, find a way to set the pot to it, easy way to do that is drilling a hole in the center. now connect ur pot to a dmm and turn it at any angle to get the resistance there
When measuring an unknown value of voltage the meter should be initially set to?
With an unknown voltage you should start out with the highest voltage setting on the meter. Doing this reduces the risk of "pegging" out the needle on an analog gauge or overloading the input of a DMM. Most DMM's are auto-ranging though.
Can a DMM be used as a simple coax tester?
You can use the DMM to test continuity in the cable.
Which meter is used to measure resistance?
each multimeter is different and they have a booklet that you can search up its range when measuring and the error% with each size of measurement.... for example if measuring ohms a DMM (digital multimeter) the range is 400 ohms and the accuracy is 0.1% +5d (d= resolution... the lowest possible value you can get on that "range") then if ur measuring a 100ohm resistor itd be 100*0.001 + 0.05 if resolution is 0.01. then you can take it one step further by getting a confidence interval as in a + - range from the original value percentage or quantitative value.
