front panel

Probe isolator, safety protection

CS448 measurement results:

rear panel

Analog triggers can also be triggered according to digital timing

Isolation 4-channel oscilloscope with 1 kV, 100 dB common mode rejection ratio, 50 MHz frequency response analyzer, LCR measurement component, MSP flow disk system, high-resolution spectrum analyzer, complex mathematical operation function, Matlab and Excel driver, external sampling clock, Ethernet or USB interface, isolated signal generator, mixed signal capture
We manufacture high-precision mixed signal collectors and have spent over a decade developing exceptional software that is easy to use and intuitive. The oscilloscope software we have developed can simplify the daily work of engineers.

harshofRequirements for floating ground measurementmainOriginating from power control circuits, such as motor controllers, uninterruptible power supplies, and industrial control equipment. In these application areas, the voltage and current may be large enough to provide users with/Or the testing equipment may pose a danger. There are many options to consider when measuring floating high voltage signals. Each option has its own advantages and disadvantages.

Comparison between differential measurement and floating ground measurement

All voltage measurements are differential measurements. Differential measurement is defined as the voltage difference between two points. Voltage measurement is divided into two categories:

1. Reference ground level measurement

2. Non reference ground level measurement (also known as floating ground measurement)）

Traditional oscilloscope

Most traditional oscilloscopes useThe 'signal reference' terminal is connected to the protective grounding system, commonly referred to as' grounding ' In this way, all signals applied to the oscilloscope or signals provided by the oscilloscope will have a common connection point. This common connection point is usually the oscilloscope chassis, which is grounded through the third line of the AC power supply equipment power cord to maintain (or near) zero volts. This means that each input channel reference point is tied to a grounded reference source. Traditional passive probes should not be used, and floating measurements should not be taken directly on an oscilloscope with a reference ground level. Depending on the amount of current flowing through the reference lead, traditional passive probes will begin to heat up; When the current is high enough, it will melt and break like a fuse.

Floating ground measurement technology

The different options provided for conducting high-pressure floating ground measurements include:

Isolation input oscilloscope

Differential probe

Voltage isolation device

■'A-B 'measurement technology

Oscilloscope 'floating ground' technology

Most desktop oscilloscopes share the structure shown below. In this structure, when performing multi-channel measurements, all input signals must have the same voltage reference, and the shared default reference isThe 'earth' is grounded. If there is no differential preamplifier or external signal isolator, these desktop oscilloscopes are not suitable for floating measurements.

Compared with the traditional desktop oscilloscope structure, the voltage reference in this isolated channel structure is not connected together inside the instrument. Therefore, each reference point of the input used must be connected to the reference voltage. The independent floating ground isolation input is still coupled by parasitic capacitance. This may occur between the input reference and the environment, as well as manually between the input reference points. For this reason, it is recommended to connect the reference point to the system ground or another stable voltage. If the input reference point is connected to the highway and/Or on high voltage signals, then you should be aware of parasitic capacitance.

Market leader in USB oscilloscopesreleaseCS448 four channel high-definition isolated oscilloscope. This instrument has four differential input channelsandVarious probes that can be used from millivolts toMeasurement of various applications of 1000 V CAT III. This new oscilloscope solves the long-standing problem of accurate voltage waveform measurement on non grounded reference circuit components, allowing electrical engineers to freely perform differential voltage measurement in the presence of common mode signals. The new instrument has a 200MHz analog bandwidth on four channels, a 14 bit ADC, a 500Ms/s sampling rate, up to 250M capture memory, and a 1KV CATIII voltage isolation capability between channels and between channels and reference ground. The common mode rejection ratio (CMRR) is as high as 100dB@50MHz Two CS448s can be cascaded to form an 8-channel isolated oscilloscope.

Electronic engineers often need to perform various low-voltage measurements in the presence of high common mode noise or constantly changing offset voltages. The grounding reference oscilloscope requires the use of two input channels and A-B mathematical functions to observe the differential signal of interest. However, due to the need for two input channels, most oscilloscopes do not have a sufficiently high common mode rejection ratio (CMRR), nor do they have the resolution required to perform measurements with sufficient accuracy. Engineers working on multiphase distribution systems need to measure the AC voltage between phases, rather than the voltage between phases and ground. A grounded reference oscilloscope cannot be used as it can cause a short circuit. External differential probes are a solution, but they are relatively expensive and bulky, and each probe must also be equipped with its own power supply. The CleverScope CS448 four channel high-definition oscilloscope has isolated differential inputs and various probe options, which can simultaneously solve these problems. The latest design of CleverScope's FET probe system can accurately capture high voltage fast rising edges (voltage changes up to 500V within 10ns). CS448 also maintains other superior performance of CleverScope oscilloscope products, including built-in signal source with isolated output, logic analyzer, protocol analyzer, frequency response analyzer, impedance analyzer, data logger, etc. In addition, CS448 comes standard with USB 3.0 interface, built-in SD card interface, and optional Gigabit Ethernet (or Gigabit fiber interface), further enhancing its data transmission/storage capabilities.