1, no isolation amplifier, insulation amplifier
The biggest difference between a storage recorder and a digital oscilloscope is whether it is insulated between input channels and between the host and the input. The input channels of the storage recorder are insulated and isolated. Digital oscilloscopes or so-called A/D converter circuits are all connected to the input channel and to one side.
When observing the electric signal on the board, etc., it is suitable for observing the multi-point signal of the common ground, but the power oscilloscope (inverter or inverter) is observed at the same time as shown in Figure 2-1. In the case of input and input, if a digital oscilloscope is used, a short circuit will occur internally.
In the case of such a multi-point input of a signal having a potential difference, the role of the memory recorder is extremely important. In the case of a digital oscilloscope, an input must be made with an isolation amplifier or an isolation amplifier.
2, the difference between resolution and precision
Resolution is the granularity at which the input signal is analog/digital converted. In the case of a digital oscilloscope, the resolution is mostly 8 bits (256 points). For example, if the range is ±10V, the minimum readable scale value is 20V of full scale divided by 256 points and 0.078. V.
The mainstream of the storage recorder is 12 bits (4096 points), and under the same conditions, the scale value that can be read is 0.0048V. A resolution of 24 bits can read a scale value of 0.000001192V.
In addition, the difference in accuracy is also advantageous for the storage recorder. The general digital oscilloscope is ±1% fs ~ 3% fs, while the storage recorder is ±0.01% rdg ± 0.0025% fs ~ ± 0.5% fs. The displacement or vibration of the device can be viewed through the sensor for more detailed viewing.
3, the number of channels is large, support a variety of signals
Digital oscilloscopes are generally 4-channel, and the memory recorder can support signal input from 2 channels to 54 channels depending on the model. In addition, a variety of signals are supported to replace the input unit. There are analog units with input voltage DC1000V (AC600V), units for connecting thermocouples, strain gauges and accelerometers, and units for connecting high-precision current sensors. In addition, it is not only a signal input but also a unit that can output a signal of a function signal generation or an arbitrary waveform generation function.
The storage recorder is active in the mechatronics field that cannot be realized by digital oscilloscopes such as voltage, current waveform and control signal mixing record of motor or inverter/inverter, gasoline engine distortion and ignition waveform recording.
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