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What is the input resistance of an ideal current-measuring DMM?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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What is The appropriate EST for performing a resistance test on a potentiometer-type TPS isolated from its circuit?
DMM
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
When measuring resistance a reading of ol on the dmm indicates?
probably overload. which means whatever is being measured is beyond the range of the current scale.
Can a DMM be used as a simple coax tester?
You can use the DMM to test continuity in the cable.
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.
What is The appropriate EST for performing a resistance test on a potentiometer-type TPS isolated from its circuit?
DMM
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 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
When measuring resistance a reading of ol on the dmm indicates?
probably overload. which means whatever is being measured is beyond the range of the current scale.
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.
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.
Can you test connectivity of circuit using DMM?
Yes. There is a sign of Speaker/sound on a side DMM. Move the knob of DMM on that symbol. Now connect one prob of the DMM on one circuit element & one under that(If you are designing the circuit on PCB or plain board). If a sound come out of that then it means that your circuit element & the portion below that are properly connected.
Who backed suported the tyrants?
the Athens and the Spartans dmm
How do you test a resistorcapacitordiodes?
With a DMM (Digital Multi Meter)
