Questions tagged [multimeter]
A multifunction measuring instrument used for measuring AC and DC voltage [V] and current [A] as well as resistance [Ω]. Many digital multimeters can also measure frequency [Hz], duty cycle [%], capacitance [F], temperature [°C], and/or other electrical or physical properties. Most are handheld; more expensive bench models are also available for applications requiring high precision.
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Intentional voltmeter fluctuation
Electrical source is 120 volt, 60 cycle AC. I am wanting to have a permanently installed analog volt meter modified to make it appear that the voltage is fluctuating. I'm sure this sounds odd but it ...
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Mistake using multimeter [closed]
I don’t know if this is the right place to post this question. If it isn’t, I’m sorry!
I was using my uni-t multimeter to measure voltage between the neutral and ground wires in an outlet, because I ...
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Are non true RMS multimeters affected by diode drop on AC? [closed]
I have several multimeters, some good Extechs that are true RMS, and some cheap Chinese DT830 meters (non true RMS). The DT830 meters only have two AC voltage ranges: 200V (with 0.1 volt voltage ...
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Multimeter Safety CAT Ratings Transient & Working Current
I am looking the CAT ratings standards from the multimeters and I can't understand what are the "Working Current" & "Transient Current" combined with the "Test Source (...
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BM2257 Multimeter - Significant-measurement in Auto-Hold Function
I have the BM2257 Multimeter and in the manual on page 15 on the AutoHold function it writes the below about Significant-measurements (readings).
What does "Significant-measurement" mean?
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The voltage reading from a Type K Thermocouple Sensor on a RIGOL digital multimeter does not correspond to the measured temperature
I am using a RIGOL DM3058E digital multimeter to read from a Type-K thermocouple. This is a standard thermocouple that plugs into a multimeter.
I am confused about the voltage reading I am seeing when ...
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Strange or normal ohmeter measurements of IRF630 N-channel mosfets
10 new (bought on ebay) IRF630 N-channel mosfets. For all except for one of the 10 mosfets measured the following on an old multimeter on ohms x1k scale which I think uses 9 V battery.
Momentarily ...
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Summing Currents of Two Parallel Ammeters
I am looking to measure the startup current for an AC powered compressor. I expect this to exceed the 10A rating on my ammeter. I have two Fluke 177 multimeters. If I were to wire the two in parallel ...
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How to correctly measure the Schottky dioded forward voltage
My goal is to check the forward voltage of a schottky diode.
To reach this, I'm using a multimeter with the Diode Test feature, but I'm finding a different value than the expected one.
Multimeter ...
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How to increase capacitance meter range with 555 timer, and what to do with Arduino
I am looking at this schematic from Nuts and Volts of a semi-auto ranging capacitance meter, which I will eventually hook up to an Arduino or some other microcontroller. Its range is 0.1F–0.01µF, but ...
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How do I figure out the outputs of a High Voltage generator (up to 11kV)
I am working on a electro adhesion project that requires me to use a HV generator that can output up to 11kV DC. But the details of the input/output voltages are unclear and I am not even sure it can ...
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Different multimeters give massively different resistance readings when measuring between HV+ and HV- on a hybrid car. Why is this?
I work on cars and we have had many cases of a fault with HV precharging time.
We are instructed to deactivate the HV system and perform a resistance measurement between HV positive and HV negative on ...
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Why can't capacitors on PCBs be measured with a multimeter?
While looking at this article, it mentioned that one cannot test the capacitance of a capacitor while it is on a PCB. The explanation given is:
The reason is, that when a capacitor is inside the ...
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How does the UT89X multimeter's Livel detection circuit work, and how can it be implemented for safety projects?
I'm examining the Live detection feature in my Uni-T UT89X multimeter, where:
Touching the red probe to a Live wire produces continuous fast beeping
Touching Neutral produces slower intermittent ...
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Understanding amperes reading on a multimeter [closed]
I am trying to measure parasitic draw on an auto battery installed in a vehicle.
I disconnect the negative cable and put the multimeter in series between the negative battery terminal and cable.
With ...
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