XDM Series Data Record Bench Multimeter

XDM Series Data Record 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

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Data-logger Mode

During recording the measurement value, possible to set the logging duration (min. 5ms), and length,then get access to chart or table result.

 

 


FAQ


What does oscilloscope consist of?


The oscilloscope is a type of electronic measuring instruments which can achieve a variety of object measurement. Then with what kind of structural components enable the general oscilloscope to complete the entire measurement process? The following section describes the components of the general oscilloscope.

The display circuit includes the oscillograph tube and its control circuit. Oscillograph tube is a special kind of tube and also an important part of the oscilloscope. The oscillograph tube consists of three parts: electronic gun, deflection system and phosphor screen.

Electronic gun

The electronic gun is used to generate and form a high-speed, bunch of electronic flow to bombard and light the phosphor screen. It mainly consists of filament F, cathode K, gate G, first anode A1, and second anode A2. In addition to the filament, the rest of the electrode structure are metal cylinders, and their axis are maintained on the same axis.

After the cathode is heated, electrons can be emitted in the axial direction; the control electrode is negative potential relative to the cathode, changing the potential can change the number of electrons through the control of the tiny hole, that is, control the brightness of the spot on the screen.

In order to improve the brightness of the screen on the screen without reducing the sensitivity of the electron beam deflection. In the modern oscilloscope, a post-acceleration electrode A3 is also added between the deflection system and the phosphor screen.

Deflection system

Oscillograph tube deflection system are mostly electrostatic deflection type, which consists of two pairs of vertical parallel metal plate composition, respectively, known as the horizontal deflection plate and vertical deflection plate.

Respectively, they control the electron beam in the horizontal and vertical movement. When the electrons move between the deflection plates, if there is no voltage applied to the deflection plate, there is no electric field between the deflection plates, and the electrons entering the deflection yoke from the second anode will move axially to the center of the screen.

If there is a voltage on the deflection plate, there is an electric field between the deflection plates, and the electrons entering the deflection yoke are directed to the designated position of the screen by the deflection of the electric field.

If the two deflection plates are parallel to each other and their potential difference is equal to zero, the electron beam having the velocity υ through the deflection plate space will move in the original direction (in the axial direction) and hit the coordinate origin of the phosphor screen .

Fluorescent screen oscilloscope

The phosphor screen is located at the end of the oscillograph tube, and its function is to display the deflected electron beam for observation. The inner wall of the phosphor screen is coated with a layer of luminescent material, so that the fluorescent screen by high-speed electron impact on the location of the fluorescence.

The brightness of the spot is determined by the number, density and speed of the electron beam. When the voltage of the control electrode is changed, the number of electrons in the electron beam will change and the light spot brightness will change.

When using the oscilloscope, it is not advisable to place a very bright spot on the screen of the oscilloscope. Otherwise, the fluorescent substance will burn out due to long-term electron impact and lose its ability to emit light.

The above is a brief introduction to the three components of the general oscilloscope, we should line up these three parts to understand, combining with the actual operation we can clearly know how these three parts works on their field. 

OWON has grew its business from display devices. So when coming to test and measurement equipment, we have large advantage on screen manufacturing and developing. OWON’s SDS series oscilloscope came early from 10 years ago with large 8 inches screen. New XDS series even support multi-touch operation, which would largely improve the working efficiency. 

How to use clamp meter?

A digital clamp meter is an electrical tester that combines a voltmeter and a clamp ammeter. Like the multimeter, the clamp meteralso undergoes a digital process from the past analog to today.

 

The clamp meter is mainly composed of an electromagnetic ammeter and a penetrating current transformer. It is a portable instrument that can directly measure the alternating current of the circuit without disconnecting the circuit. It is very easy to use in electrical maintenance and it is widely used.


The clamp meter was originally used to measure AC current. Nowadays, the multimeter has all the functions it can use to measure AC and DC voltage, current, resistance, capacitance, temperature, frequency, diode, and continuity.

1. According to need, choose A~(AC) or A—(DC) file.

 

2. Press the trigger to clamp the clamp meter head into the current wire to be tested and hold it in the middle of the clamp head.


3, when the measured current is very small, its reading is not obvious, you can test the wire around a few turns, the number of turns to be the number of turns in the middle of the jaw, then the reading = measured value / number of turns.

 

4. During measurement, the conductor under test shall be placed in the center of the jaws and close the jaws to reduce errors.

 

Note

(1) The voltage of the circuit under test is lower than the rated voltage of the clamp meter.

 

(2) When measuring the current of the high-voltage line, wear insulating gloves, wear insulated shoes, and stand on the insulation mat.

 

(3) The jaws must be closed tightly without live switching.

 

(4) For the manual range clamp meter, if you do not know the measured current range, you need to set it to the maximum range

TIPS:

TIPS on Using Oscilloscope


An oscilloscope is a widely used electronic measuring instrument. It can convert electric signals that are invisible to the naked eye into visible images, making it easier for people to study the changing process of various electrical phenomena. The oscilloscope uses a narrow electron beam consisting of high-speed electrons to create a tiny spot on a screen coated with a fluorescent substance. Under the action of the signal under test, the electron beam is like a pen tip, which can depict the curve of the instantaneous value of the signal under test on the screen. Using an oscilloscope, you can observe waveforms of various signal amplitudes over time. You can also use it to test various power levels, such as voltage, current, frequency, phase difference, amplitude, and so on.

(1) The general oscilloscope adjusts the brightness and focus knob to minimize the spot diameter to make the waveform clear and reduce the test error; do not make the light spot stay a bit fixed, otherwise the electron beam bombardment should form a dark spot on the fluorescent screen, damage Fluorescent screen.

(2) Measurement systems, such as oscilloscopes, signal sources, printers, computers, etc.; the ground wire of the tested electronic equipment, such as instruments, electronic components, circuit boards, and the power supply of the device under test, must be connected to the public ground (ground). .

(3) The casing of the general oscilloscope, the metal outer ring of the signal input end BNC socket, the probe grounding wire, and the grounding wire end of the AC220V power outlet are all connected. If the instrument is not connected to a ground wire and the probe is used to measure the floating signal directly, the instrument will generate a potential difference with respect to the ground; the voltage value is equal to the potential difference between the ground wire of the probe and the point of the device under test and the earth. This will pose serious safety hazards to the instrument operator, the oscilloscope, and the electronic device under test.

(4) If the user needs to measure the switching power supply (switching power supply primary, control circuit), UPS (uninterruptible power supply), electronic rectifiers, energy saving lamps, inverters and other types of products or other electronic equipment that can not be isolated from the mains AC220V floating ground For signal testing, DP100 high voltage isolated differential probes must be used.

What is the difference between oscilloscope and spectrum analyzer?


Could not tell the difference between oscilloscope and spectrum analyzer often making joke, in order to avoid flaws, this article briefly summarizes the following four points - with real-time bandwidth, dynamic range, sensitivity, power measurement accuracy, compare the oscilloscope and spectrum analyzer analysis performance indicators To distinguish between the two.

1 Real-time bandwidth

For oscilloscopes, the bandwidth is usually its measurement frequency range. The spectrum analyzer has bandwidth definitions such as IF bandwidth and resolution bandwidth. Here, we discuss the real-time bandwidth that can analyze the signal in real time.

For spectrum analyzers, the bandwidth of the final analog IF can usually be used as the real-time bandwidth of its signal analysis. The real-time bandwidth of most spectrum analysis is only a few megahertz, and the wide real-time bandwidth is usually tens of megahertz. The widest bandwidth FSW can reach 500 MHz. The oscilloscope's real-time bandwidth is its effective analog bandwidth for real-time sampling, typically hundreds of megahertz, and up to several gigahertz.

What needs to be pointed out here is that most real-time oscilloscopes may not have the same real-time bandwidth when the vertical scale setting is different. When the vertical scale is set to the most sensitive, the real-time bandwidth usually decreases.

In terms of real-time bandwidth, the oscilloscope is generally better than the spectrum analyzer, which is particularly beneficial for some ultra-wideband signal analysis, especially in the modulation analysis has unparalleled advantages.

2 dynamic range

The dynamic range indicator varies according to its definition. In many cases, the dynamic range is described as the level difference between the maximum and minimum signal measured by the instrument. When changing the measurement settings, the instrument's ability to measure large and small signals is different. For example, if the spectrum analyzer is not the same in attenuation settings, the distortion caused by measuring large signals is not the same. Here, we discuss the ability of the instrument to measure large and small signals at the same time, ie, the optimal dynamic range of the oscilloscope and the spectrum analyzer under appropriate settings without changing any measurement settings.

For spectrum analyzers, the average noise level, second-order distortion, and third-order distortion are the most important factors that limit the dynamic range without considering the near-end noise and spurious conditions such as phase noise. The calculation is based on the specifications of the mainstream spectrum analyzers. Its ideal dynamic range is about 90dB (limited by second-order distortion).

Most oscilloscopes are limited by the number of AD sampling bits and the noise floor. The ideal dynamic range of traditional oscilloscopes usually does not exceed 50dB. (For R&S RTO oscilloscopes, the dynamic range can be as high as 86dB at 100KHz RBW)

In terms of dynamic range, spectrum analyzers are superior to oscilloscopes. However, it should be pointed out here that this is true for the spectrum analysis of the signal. However, the frequency spectrum of the oscilloscope is the same frame data. The spectrum of the spectrum analyzer is not the same frame data in most cases, so for the transient signal, The spectrum analyzer may not be able to measure it. The probability that an oscilloscope finds transient signals (where the signal satisfies the dynamic range) is much greater.

3 Sensitivity

The sensitivity discussed here refers to the level of minimum signal that the oscilloscope and spectrum analyzer can test. This indicator is closely related to instrument settings.

For an oscilloscope, when the oscilloscope is set to the most sensitive position on the Y axis, usually the oscilloscope can measure the minimum signal at 1mV/div. Aside from port mismatch, the noise and trace generated by the oscilloscope's signal channel are not. The noise caused by stability is the most important factor that limits the sensitivity of the oscilloscope.

4 Power Measurement Accuracy

For frequency domain analysis, power measurement accuracy is a very important technical indicator. Whether it is an oscilloscope or a spectrum analyzer, the amount of influence on the power measurement accuracy is very large. The following are the main influences:

For oscilloscopes, the impact of power measurement accuracy is: port mismatch caused by reflection, vertical system error, frequency response, AD quantization error, calibration signal error.

For the spectrum analyzer, the impact of power measurement accuracy is: port mismatch caused by reflection, reference level error, attenuator error, bandwidth conversion error, frequency response, calibration signal error.

Here, we do not analyze and compare the influence quantities one by one. We compare the power measurement of the 1GHz frequency signal. Through measurement comparison between the RTO oscilloscope and the FSW spectrum analyzer, we can see that the power measurement values of the oscilloscope and the spectrum analyzer are at 1GHz. Only about 0.2dB difference, this is a very good measurement accuracy indicator. Because the spectrum analyzer's measurement accuracy at 1GHz is very good.

In addition, in the frequency range, the oscilloscope's frequency response is also very good, not exceeding 0.5dB in the 4GHz range. From this point of view, the oscilloscope is even better than the spectrum analyzer performance.

In general, oscilloscopes and spectrum analyzers have their own advantages in frequency domain analysis performance. Spectrum analyzers are superior in terms of sensitivity and other technical indicators. Oscilloscopes are superior to spectrum analyzers in real-time bandwidth. When measuring different types of signals, you can choose according to the test requirements and the different technical characteristics of the instrument.





Specification

XDMMeasurement RangeFrequency RangeAccuracy: 1 Year ±(% of reading +% of range)
DC Voltage600mV, 6V, 60V, 600V, 1000V/0.02±0.01
True RMS AC Voltage600mV, 6V, 60V, 600V, 750V20 Hz - 50 Hz2 + 0.10
50 Hz - 20 kHz0.2 + 0.06
20 kHz - 50 kHz1.0 + 0.05
50 kHz - 100 kHz3.0 + 0.08
 DC Current600.00 μA/0.06 + 0.02
6.0000 mA0.06 + 0.02
60.000 mA0.1 + 0.05
600.00 mA0.2 + 0.02 
6.000 A0.2 + 0.05
10.0000 A0.250 + 0.05
True RMS AC Current60.000 mA, 600.00 mA, 
6.0000 A, 10.000 A
20 Hz - 45 Hz2 + 0.10
45 Hz - 2 kHz0.50 + 0.10
2 kHz - 10 kHz2.50 + 0.20
Resistance600.00 Ω/0.040 + 0.01 
6.0000 kΩ0.030 + 0.01
60.000 kΩ0.030 + 0.01
600.00 kΩ0.040 + 0.01
6.0000 MΩ0.120 + 0.03 
60.000 MΩ0.90 + 0.03 
100.00 MΩ1.75  + 0.03
Diode Test3.0000 V/0.5 + 0.01
Continuity1000 Ω/0.5 + 0.01
Frequency Period200 mV - 750 V20 Hz - 2 kHz0.01 + 0.003
2 kHz - 20 kHz0.01 + 0.003
20 kHz - 200 kHz0.01 + 0.003
200 kHz - 1 MHz0.01 + 0.006
20 mA - 10 A20 Hz - 2 kHz0.01 + 0.003
2 kHz - 10 kHz0.01 + 0.003


Test Current
Capacitance2.000 nF200 nA3 + 1.0
20.00 nF200 nA1 + 0.5
200.0 nF2 μA1 + 0.5
2.000 μF10 μA1 + 0.5
200 μF100 μA1 + 0.5
10000 μF1 mA2 + 0.5
Temperaturetemperature sensors under 2 categories supported - 
thermocouple (ITS-90 conversion between B / E / J / K / N / R / S / T type), and thermal resistance (RTD sensor conversion between Pt100 and Pt385 type)




Data-logger Function
Logging Duration5ms
Logging Length1M points

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