AMPROBE AM140-A TRMS Precision Digital Multimeter

AMPROBE AM140-A TRMS Precision Digital Multimeter  is a True TRMS commercial grade digital multimeter that offers more features and better accuracy at a great price.

AM140A measures AC/DC voltage to 1000V, True-rms, accuracy to 0.02%, frequency, capacitance, duty cycle, analog bar graph, and PC interface. The Amprobe AM-140-A multimeter also features auto and manual ranging, ato power off, DC loop current to 4-20mA, a high speed analog bar graph and a large backlit display. The Amprobe AM-140-A is a versatile instrument with all the features you need and is CAT IV 600V, CAT III 1000V saftey rated.

Why you need a True-RMS Reading Multimeter

True-RMS instruments are accurate on any AC waveform. There are two basic AC measuring systems. One is “average sensing, RMS indicating.” This is the most common system because it is affordable and easy to manufacture. An instrument with this type of measuring system measures the average of a sine wave, and then multiplies it by 1.112, allowing the instrument to indicate RMS. This measuring system is only accurate on sine waves.

second measuring method is called “RMS Sensing, RMS Indicating.” An instrument with this type of measuring system computes the RMS value of the measured waveform (sine or otherwise). This is referred to as “True-RMS” reading. This measuring system is accurate for any waveform. When an average sensing instrument is used on a non-sinusoidal waveform, measurement accuracy could be off as much as 50%. Since you may not know what type of AC waveform you are measuring, a True-RMS instrument should be used whenever possible.

Features :

True-rms
Measurements: voltage up to 1000V AC/DC, resistance, AC/DC current, frequency, capacitance, duty cycle
Optical isolated PC interface capability
Crest (peak hold), max, min, max-min, recording
Auto and manual ranging
Intelligent auto power off
Data hold
Relative zero mode
Audible and visual warning against improper plug-in
DC loop current 4-20mA
dBm reading with 20 selectable impedance values
Backlight display
Large, easy to read large LCD display
High speed analog bar graph
Diode test
4-20mA DC loop current
Audible continuity

What’s in the Box :

(1) Battery (installed)
(1) Users manual
(1) Test leads