Isolated Oscilloscope

The CS448 is a 1kV isolated channel oscilloscope designed to be useful anywhere isolation is needed - in particular power electronics. The CS448 supports - via the Cscope4 application- Frequency Response Analysis (using the built in isolated signal generator), Protocol decoding, Maths, streaming, Excel and Matlab connectivity, Spectrum Analysis, mixed signal triggering and display. The high channel common mode rejection ratio (100 dB at 50 MHz) means the CS448 can be used to measure signals such as gate drives and current sensors whose common mode is slewing quickly.

The CS448 comes complete with:

4 off 1x/10x (8/80V) 250 Mhz probes
4 off 100x (800V) 300 MHz probes. If you wish these can be swapped for 200 x probes (1600V)
4 off Scope probe cable Common mode chokes to reduce high edge rate ring.
2 off isolated digital channel pods (Chan 1-4 + Chan 5-8).
Power Supply + IEC cable for your country
USB3 cable
SMA - BNC adaptor for signal generator.
SFP module for Ethernet - choose optical or copper
CD with application, data sheet and user manual. Drivers coming soon.
Install app note.

You might also like to check out the CS1110 VceSat Probe and the CS1070 Power amplifier to increase the versatility of the system.

Analog Inputs

Parameter	Specification	Notes
Analog Bandwidth	200MHz
Number of channels	4
Isolation Voltage	1kV working	Supported by IEC 61010-1 creepage and clearance, reinforced, Category III and 1.5kV Class II. Plan to certify
CMRR	> 120 dB at 1 MHz > 115 dB at 10 MHz > 100 dB at 50 MHz	Done using a 20 dBV test source
ADC resolution	14 bits
Input Ranges	±0.8V and ±8V	Use probes to extend the range, eg 800V with 100x probe. The application automatically scales all values to compensate for probe attenuation.
Sample Rate	500 MSPS	All Analog and Digital channels simultaneously.
Sample Memory	250 M Samples	For a single channel. For four channels = 62.5 Msamples (125 msecs at full rate).
CM leakage to other channels	<-125dBc	20 dBV signal to CM channel, measured on other channels whole bandwidth, ±0.8V range
Channel to Channel Skew	< ±144ps	Done using a 1 MHz coherent sine wave
Cross talk at 10.7 and 30 MHz	< -115 dBc	Using 1.6V p-p into the channel
RMS Channel Noise 1 M samples	< 210 uV rms, ±0.8V range < 2.1mv rms, ±8V range	Inputs open
Pk-Pk Channel noise 1 M samples	1.8mVp-p for ±0.8V range 15mVp-p for ±8V range	Inputs open
Sample clock jitter	300 fs rms
Sample clock absolute Freq accuracy	±2 ppm	At 23 deg C
Sample clock temp stability	±0.5 ppm	Over -40 to +85 deg C
Enob (rms)	11.6 bits, or 1 part in 3,300	Inputs open
Noise free bits	10.3 bits, or 1 part in 1300	Inputs open
Spectral Noise floor, no protrusions	-100 dBV -115dBV	<2MHz, 200 MHz BW, 1kHz resolution >2MHz, 200 MHz BW, 1kHz resolution
Sinad	> 64 dBc at 1 MHz > 63 dBc at 10 MHz > 55 dBc at 30 MHz	1 Vp-p into 50 ohms signal
HD2+3	< -80dB at 1MHz < -76 dB at 10 MHz < -71 dB at 30 MHz	1 Vp-p into 50 ohms signal
THD	< -76 dB at 1 MHz < -74 dB at 10 MHz < -67 dB at 30 MHz	1 Vp-p into 50 ohms signal
Pulse Flatness	< 700uV < 2mV < 1V	0.5V pulse, 500us duration, ±0.8V range 0.5V pulse, 500 us duration, ±8V range 500V pulse, 500us duration, 100x probe
Overload recovery	4ns	Recovery from 10x overload
Maximum Differential Input Voltage	±1 kV, derated above 1 MHz.	Derated at 20dB/decade
Maximum Common Mode Input Voltage	±1 kV, derated above 10 MHz.	Derated at 20dB/decade
Spectral Flatness	±0.2dB from 0 - 160 MHz -2 dB at 200 MHz	Supports 200 MHz Bandwidth
Input Resistance	1 M Ohm	DC resistance
Input Capacitance	20 pF	Signal Input to Signal Common
Isolation Capacitance	< 14pf	Channel ground to chassis
Isolation Capacitance	< 6pf	Channel to channel

Digital Inputs

Parameter	Specification	Notes
Number of inputs	8
Common mode transient immunity	100 kV/us
Input threshold max	2.3V rising 0.9V falling	Inputs are Hysteretic
Isolation capacitance	< 5pF	To chassis ground, at 1 MHz
Isolation operating voltage	880V DC 1130V DC	Re-inforced insulation, EN61010-1 Re-inforced insulation, CSA and IEC 60950-1
Maximum Data rate	100 Mbps
Propagation delay	13ns typ	Compensated for within CS448

Signal Generator

Parameter	Specification	Notes
Output Frequency Range	DC - 65 MHz	-3dB at 65MHz on filtered output
Outputs	Unfiltered, filtered	Unfiltered is used for square wave signals with minimum rise time. Filtered output includes reconstruction filter for maximum smoothness
Output Impedance	50 Ohm
CMRR	> 120 dB at 1 MHz > 115 dB at 10 MHz > 100 dB at 50 MHz	Limited by analog inputs used for test. 20dBV signal applied to coax common linking sig gen and analog input.
Common mode transient immunity	100 kV/us	For control of the output DAC
Isolation Voltage	600VRMS working	Supported by IEC 61010-1 creepage and clearance, reinforced, Category III Plan to certify
Unfiltered rise/fall time	3.2ns	Full scale swing
Sine Wave Flatness	±0.2 dB	0 - 40 MHz filtered
DAC resolution	12 bits
Output amplitude	±1mV to ±3.5V p-p	Programmable 1mV resolution, constrained to total range ±3.5V including offset
Output offset	0 to ±3.2V p-p	Programmable, 1mV resolution

USB

Parameter	Specification	Notes
Supported Modes	USB 2.0 and USB 3.0	USB 2.0 @480 Mbit/sec and USB 3.0 at 5 Gbps
Throughput	30 MBps and 180 MBps
Connector	USB-C	Plug is reversible
Protection	Common mode choke + ESD diodes	Using ECMF04-4HSWM10
Indicators	USB on and correctly connected	Loss of signal is indicated by LED off.

Ethernet

Parameter	Specification	Notes
Connection method	Small Form factor Pluggable module (SFP)	An SFP socket is provided for use with an SFP module. Either an optical or a copper connected SFP module will be supplied based on the order.
Wired Supported Modes	Ethernet 10/100/1000	Using an RJ45 Ethernet socket connected copper SFP module. Transformer based isolation. Specific SFP module required.
Optical supported mode	Ethernet 1000BASE-LX	Gigabit (1G) Ethernet using an LC fibre cable connected optical module. Full optical isolation.
Throughput	12 MBps and 120 MBps
Connector	SFP Socket	Small Form factor Pluggable socket
Indicators	Ethernet on and correctly connected	Loss of signal is indicated by LED off.

Power Supply

Parameter	Specification	Notes
Input Voltage Range	10-24 DC
Power consumption	36W
Connector	Barrel Socket, 2.5mm I.D. x 5.5mm O.D	Connection is reverse polarity protected.
Protection	Clamped to +68V Clamped to -32V Operates with 35V Survives with 5V	ISO16750 pulse A (79 ohm 0.5 ohm) ISO7637 Pulse 1 (-600V, 50 ohm) FPGA operation at 5V, ADC operational at 7V.
Indicators	Power On	Software controlled.

Digital Port

Parameter	Specification	Notes
Input/Outputs	16	Programmable as In or Out
Logic Level	Programmable 1.8 - 5V	All I/O operate at the same logic level
Control IC	Silego SLG46533V	User configurable programmable logic with analog functions
Resources	24 Look Up Tables (LUTs) Prog Oscillator, 25MHz, 2MHz, and 25 kHz. Prog Delay, 3 Output 16x8 RAM and OTP 4 Analog Comparators 2 x Deglitch filters	2-4 bit for complex logic All resources can be arbitrarily connected as required.
Programming	Silego GP Designer	Visual schematic designer of circuit functions downloaded into CS448
Trigger In/Out	Bidirectional Trigger	The trigger may be programmed to initiate a Digital Port sequence, or the Digital Port can trigger an analog acquisition.
Protection		Over voltage protection to +12V and -6V

Link Port
The Link Port is used for controlling Cleverscope accessory devices such as the CS1070 1A 50 MHz power amplifier, and the CS1110 VCE Sat Probe. It also includes RS232, SPI and I2C ports for controlling user equipment.

Parameter	Specification	Notes
Digital Port Use	2 Digital In, 4 Digital Out	Used for accessory control
I2C Port	400 kbps port	For control of user devices
SPI Port	1 MHz SPI Port	For control of user device, mutually exclusive with RS232 Port
RS232/RS422 Port	3V level RS232 port, or differential RS422 port, programmable baud rate	For control of user device, mutually exclusive with SPI Port
Trigger Port	Trigger In/Out and control	Used for linkage to CS328A link port
Protection		Over voltage and reverse voltage protection using ESD devices

Link In/Out Port
The Link In/Out Port is used daisy chaining 2 or more CS448 Cleverscopes.

Parameter	Specification	Notes
Clock ports	Reference clock, 500 kHz	The last CS448 in the chain provides the 500 kHz reference clock that is used for simultaneous sampling by all units.
Trigger Ports	Trigger transfer	The Trigger Ports transfer the triggering unit's trigger to other units.
Control Ports	Control signals	The control signals are used to signal readiness to trigger, and sampling state.

Probe Compensator Output
The probe compensator is used to compensate 10x, 100x and 200x probes.

Parameter	Specification	Notes
Signal	1 kHz Square Wave
Amplitude	8 -12V	Output impedance is 50 Ohm.
Rise Time	3ns

Environmental

Parameter	Specification	Notes
Temperature	0°C to +40°C -20°C to +60°C	Operating Storage
Cooling Method	Fan Assisted
Humidity	0°C to +40°C >40°C	<90% relative humidity <60% relative humidity
Altitude	<3,000m 15,000m	Operating Non-operating

Mechanical

Parameter	Specification	Notes
Size	Height 55 mm Width 164 mm Length 247 mm	Including feet Including connectors
Weight (approx)	1150 gm 2400 gm	Acquisition Unit only Complete in display box
Material	Powder Coated Aluminium

Data Sheet