XDM Series True RMS Bench Multimeter

XDM Series True RMS Bench Multimeter

- 4 inch 480 x 320 pixels high resolution LCD - reading rates up to 150 readings/s - true RMS AC voltage / current measurement - dual line display supported - the change trend analysis accessible via special chart mode - SCPI supported - remote control, and data-sharing possible via LAN, USB, RS232 port, and WiFi* * WiFi module is optional - multi- IO interface: USB Device / Host, RS232, LAN, and ext. trigger input

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Product Details

XDM Series True RMS Bench Multimeter

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Dual display


Dual display enables two kinds of data display at the same time. For example, as figure shows, the multimeter shows the DC and AC voltage at the same time. Can also switch to current. This expand the measurement method for industrial and laboratory field. 


How to know whether the oscilloscope is accurate

It’s enough for engineer when the waveform captured by oscilloscope occupy 2 divisions of the display area. They don’t think it’s necessary to zoom the waveform to a full screen size. And it’s wrong actually. Today we’ll see why we need to put the waveform at full size of the screen.

The difference between 2 division and full screen display is that the waveform would be “extended”. This cause the change of vertical scale value, which influence the accuracy of vertical measurement. The relation between 8-bits ADC and vertical measurement appears mostly important.

Take the ruler for example, if you take 1m ruler to measure 1.6cm object, it will be 2cm at result. And if you use 10cm ruler, it will come to 1.6cm. This is to say, the smaller the measure unit, the more accurate it is. 

So, how does the change of vertical scale value influence the accuracy of measurement?

1. Influence from vertical resolution

The normal digital oscilloscope in the market integrates 8-bits ADC. Every

waveforms are reunited by 256 units of “0” and “1”. We assume that 8 divisions

are the full scale at vertical side, and the quantification level at 256. While the

vertical scale is 500mV/div, the vertical precision will be (500mV x

8)/256=15.625mV. For the same signal, when the vertical scale switch to

50mV/div, that is (50mV x 8)/256=1.5625mV. The vertical precision reaches


To make the measurement accurate, you can follow the tip:

Make the measured signal occupy around 6 div of the display screen. Like when you measure a 7Vpp Peak-Peak value sine waveform, the vertical scale should set at 1V/div instead of 2V/div or 5V/div. Furthermore, the voltage resolution is also involved in. Like when it’s on 1V/div voltage, the resolution will be 1V/25=40mV. When it is at 10V/div, the resolution will be 10V/25=400mV. It can be seen that at 1V/div, the resolution will be higher and the value more accurate.