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> Micronta true rms digital bench test multimeter 22-175A
Micronta true rms digital bench test multimeter 22-175A
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This Micronta True RMS Multimeter is a portable 3 2/3-digit, meter ideally
suited for field, lab, shop, bench, and home use. It makes true RMS
measurements, a feature you normally find only in the most expensive test
instruments, so AC measurements are as accurate as possible. Here are
some features that make the meter a real pro.
gives a more accurate reading for non-sine wave AC measurements.
Transistor-Check Function - measures the gain (hFE) of small-signal,
bipolar transistors and identifies pin-out and type.
Capacitor-Check Function - measures the capacitance of low-voltage capacitors.
Frequency Counter - measures frequencies up to 2 MHz.
One-Finger Function Selector -
makes it easy to use your meter when youhave only one hand free.
RMS stands for Root-Mean-Square. RMS is a standard method for determining
the effective value of a varying or alternating voltage. The RMS value is
the DC voltage that would produce the same amount of heat as the voltage
you are measuring, if you were to apply both voltages across identical
The true RMS value is helpful when you need to measure an AC voltage that
Most meters use average-responding ACconverters.
These meters are calibrated with pure sine waves. If you
measure a sine wave that does not have harmonic distortion, the meter
gives an accurate reading. But, if the sine wave is not pure - there are
distortions within the waveform, or you measure triangle waves or square
waves - the average-responding meters display an incorrect value.
For example, a 2-volt peak-to-peak, 50% duty cycle square wave measures
correctly as 1.000 VAC on this meter.
An average responding meterdisplays 1.111 VAC - an error of more than 11 percent!
The maximum frequency your meter can accurately measure is 5000
Hz for ACvoltage and 1000 Hz for AC current.
The allowable crest factor is 1:1 to32:1.
The crest factor is the ratio of the peak signal value divided by
A 10% duty cycle square wave with a peak voltage of 3
volts has an RMS value of about .95 volts.
This gives a crest factor of3.16 (3V / .95V), and is outside this meter's range of accuracy.
True RMS Multimeter (220-0175A)
Ranges Resolution Accuracy (MaximumReading)
1000 V 1 V +/- 20V, +/- 2 Digits
399.9V 100 mV +/- 1.00%, +/- 2 Digits
39.99 V 10 mV +/- 1.00%, +/- 2 Digits
3.999 V 1 mV +/- 1.00%, +/- 2 Digits
399.9 mV 100 uV +/- 1.50%, +/- 2 Digits
Input Impedance.........................10 Megohms in parallel with <50 pF
Normal Mode Rejection Ratio................................>60 dB at 60 Hz
Response Time to Rated Accuracy..........................2 Seconds Maximum
Maximum Input.....................................................1000 VDC
AC Volts (True RMS, AC Coupled)
Ranges Resolution Accuracy Accuracy
(Maximum at 60Hz-1kHz at 30Hz-5kHz
399.9 V 100 mV 3%, +/-3 5%, +/-5
39.99 V 10 mV 3%, +/-3 5%, +/-5
3.999 V 1.0 mV 3%, +/-3 5%, +/-5
399.9 Mv 100 Uv 3%, +/-3 - - - - -
Maximum Input Voltage..................................60 dBm, 1000 V Peak
Input Impedance.............................1Megohm in Parallel with 50 pF
