XDM Series Auto-scale 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 inputSend InquiryChat Now
XDM Series Auto-scale Bench Multimeter
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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.
What factors decide the DSO probe pricing ?
The probe bandwidth, and function decides its pricing.
According to the function, there are many probe categories, including high voltage probe, differential probe, active high speed probe, and etc. Different probe category pricing ranges from less than USD10.00 till USD10,000.00.
The probe acts as the connection media of circuit to oscilloscope, a high fidelity signal output is a must - considering this, even for passive probe, its inner structure get complicated parts to compensate the circuit.
How to use the oscilloscope to measure the maximum value of one modulated waveform, which carrier frequency is dozens of KHz, and the frequency of the modulated wave is power frequency ?
The power frequency may be low frequency, say 50Hz/60Hz, and carrier wave is dozens of KHz, the period of one power frequency is about 20ms, if to observe a signal with period of 20ms, then the duration of oscilloscope acquisition window at least should be 2ms/div x 10div, and at the same time determine the sample rate of oscilloscope according to the carrier wave. At last, acquisition memory length which is required can be estimated, and judge whether it could meet the testing requirement.
How to use spectrum analyzer for noise testing?
The spectrum analyzer is a powerful tool for making noise measurements. In general, spectrum analyzers can display the relation between power (or voltage) and frequency, which is similar to the noise spectral density curve. In fact, some spectrum analyzers have a special mode of operation that allows the measurement results to be displayed directly in spectral density units (ie nV/rt-Hz). In other cases, the measurement result must be multiplied by a correction factor to convert the relevant unit of measure into spectral density units.
spectrum analyzers, like oscilloscopes, are both digital and analog. One method of generating a spectral curve by an analog spectrum analyzer is to sweep a band-pass filter at various frequencies while plotting the measured output value of the filter. Another approach is to use superheterodyne reception, which performs scanning of the local oscillator at various frequencies. However, digital spectrum analyzers use fast Fourier transforms to generate the spectrum (often used with superheterodyne receiving technology).
Although the spectrum analyzers used are of different models, some major parameters still need to be considered. The start and stop frequencies indicate the frequency range over which the bandpass filter is scanned. The resolution bandwidth is the width of the bandpass filter scanned in the frequency range. Reducing the resolution bandwidth will increase the ability of the spectrum analyzer to process signals at discrete frequencies while extending the scan time. Figure 1 shows the operation of the scan filter. Figure 2 and Figure 3 show the results obtained when the same spectrum analyzer uses different resolution bandwidths. In Figure 2, because the resolution bandwidth is set very small, discrete frequency components (ie, 150 Hz) are properly handled. On the other hand, in Fig. 3, the discrete frequency component (ie, 1200 Hz) has not been properly handled because the resolution bandwidth is set to be very large.