Cleverscope

The CS548 Isolated-Channel Oscilloscope

The CS548 is a four-channel oscilloscope with individually isolated channels and high CMRR. It can also be supplied with fewer channels, from zero to three, if a reduced configuration is sufficient. The unit is designed to measure all signals in an operating full-bridge or three-phase power electronics switching bridge, on both the low and high sides.

Typical applications include measuring gate-drive voltage and charge, power-switch losses and parasitic stress, output power and spectrum for EMC compliance, and control-system gain, phase, and stability. The CS5X8 also includes an isolated signal generator for stimulus and two expansion pod connectors for isolated input and output functions. Up to four CS548 units can be slaved together to create a 16-channel oscilloscope with coherent sampling.

Cleverscope with additional 'remote digitizer', offering an additional optically isolated BNC channel.

Cleverscope with additional 'remote digitizer', offering an additional optically isolated BNC channel.

Key Specifications

  • Isolated-channel capture (2kV DC Class III),
  • 100 dB CMRR at 50 MHz,  
  • Frequency Response Analysis,
  • Component LCR measurement,
  • MSPS streaming to disk for days,
  • high resolution spectra,
  • sophisticated maths,
  • Matlab and Excel live,
  • external sampling clock,
  • Ethernet or USB,
  • Isolated Signal Generator, mixed signal capture, and more.
CS548 front

CS548 front

CS548 back

CS548 back

Use and Application

The CS548 is a 2 kV DC isolated-channel oscilloscope designed for applications that require isolation and high CMRR, especially in power electronics. When used with the CS1200 Digitizer, the system can provide more than 30 kV of isolation.

Through the CS302 64-bit software, the CS548 supports Frequency Response Analysis using the built-in isolated signal generator, as well as protocol decoding, math functions, streaming, Excel and MATLAB connectivity, spectrum analysis, and mixed-signal triggering and display.

The CS548 is intended for measurements in power electronics systems, including high-side measurements. It can be used to measure all high-side nodes, perform EMC measurements, observe startup behavior, calculate power loss and switching energy, and analyze message contents.

It is also available with three, two, one, or no internal channels, which can be useful if fewer local channels are needed or if the system will primarily use remote channels such as the CS1200. Please contact us if you are interested in one of these configurations.

The CS548 is part of a broader tool set designed to support the full verification and testing of power electronics designs, from prototype evaluation through production testing.

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Options and Accessories

The CS548 includes the accessories you need to get measuring:

  • For each channel: A 1x/10x probe, and a 100x probe, which can be optionally swapped for a 200x probe. A clamp on common mode choke to improve CMRR in high slew rate applications. 
  • CS1051 19V 65W grounded power supply.
  • An IEC power cable suited to your country. 
  • A shielded 2m USB3 cable. 
  • 2 x CS1301 digital input pods and clips.
  • A CS1042 SFP Ethernet adaptor (copper) or CS1043 fiber. Please specify at purchase.  
  • An SMA to BNC adaptor for the signal generator SMA output. 
  • Software application and Rom Loader installer on a USB stick.  

It includes  these capabilities:

  • A software application, and DLL driver to control between 1 and 4 oscilloscopes as a single 4-16 channel oscilloscope, capable of streaming to hard disk, doing Time and Spectrum, Symbolic Maths, Matlab integration, FRA, Protocol Decoding and Signal Statistics. 
  • Four internal isolated input channels for measurement of signals with a common mode voltage change of 100V/ns at up to 2kV common mode.
  • Four remote channel sockets for use with the CS1200 remote Digitizer. The CS1200 is linked by active optical fibre at up to 30m distance for use in high voltage enclosures (up to 30kV common mode). 
  • Really good resolution (14 bit) with noise free measurement of 1 part in 1300. 
  • An isolated signal generator, 0-65MHz,  (also 100V/ns common mode) to do Frequency Response Analysis (FRA). Use it for stability analysis and gain/phase on working power electronics modules, Impedance measurement of power planes, inputs and outputs, and measurement of inductors and capacitors over frequency. 
  • Two pod high speed interfaces for I/O expansion. 
  • Two CS1301 Isolated digital input pods for measuring logic signals with high common mode voltages (1130V DC) - 4 digital inputs each for a total of 8 digital inputs.
  • The CS1302 Isolated digital I/O pods is an optional separate purchase for generating up to 4 outputs for double pulse, half or full bridge PWM control or arbitrary pulse sequences. It includes one input pod, and can be used to make an isolated SPI or UART pod. Support for the CS1302 is in the Pulse Builder part of the application.
  • Other Pods that are in development and will be available with a free firmware upgrade when completed:CS1303 Measurement Hub
    This pod allows connection and identification of up to four CS1304-CS1306 measurement pods to a single CS548 Pod connector.CS1304 Isolated Current Measurement
    This pod uses a TI AMC3306M05 with ±50mV input range, to provide an isolated channel for current sense such as 50mV Murata 3020 DMS or Riedon RSA shunts.CS1305 Isolated Voltage Measurement
    This pod uses a TI AMC3336 with ±1V input range to provide an individually isolated channel, for voltage sense. The CS1305 comes in 5 variants, with input ranges of ± 1, 10, 100, 1000 and 2000V.CS1306 Isolated Temperature Measurement
    This pod uses an AD8495 K type thermocouple amplifier driving a TI AMC3336 with ±1V input range to provide an individually isolated channel to measure up to 400 ºC.CS1307 CAN controller
    The CAN controller will use an SPI CAN controller (such as Microchip MCP2515 or TI TCAN4550) to monitor or stimulate CAN messages in an automotive CAN network.
  • These support products are useful for saturated transistor voltage measurement and higher power FRA:
  • CS1133 Vsat probe pod for measuring mV saturation levels while switching up to 3kV for power loss measurement. It is isolated for high or low side measurements.
  • CS1070 50 MHz power amplifier with 36Vpp 1A output for wide bandwidth higher power FRA. 
  • Download the specs from here.

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PMK America Corporation

14775 NW Jewell Lane
Portland, Oregon USA 97229

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