CS448 ~ Isolated Oscilloscope
The CS448 is our new 1kV isolated channel oscilloscope. It is designed to be useful anywhere isolation is needed - in particular power electronics. Measurements can be made on gate drives slewing at 100kV/us to check gate drive details.
Each channel is isolated from the other, and ground, to 1kV working voltage. The common mode rejection ratio is >100 dB at 50 MHz. We use 14 bit ADC's at 500 MSPS to give very good dynamic range, with a noise floor below 100 dBV. At 10 MHz, Sinad is >60 dB, THD<-76 dBc and HD2+3<-80 dBc. Phase variation between channels is better than +/-90ps (on the same range).
Each channel is isolated from the other, and ground, to 1kV working voltage. The common mode rejection ratio is >100 dB at 50 MHz. We use 14 bit ADC's at 500 MSPS to give very good dynamic range, with a noise floor below 100 dBV. At 10 MHz, Sinad is >60 dB, THD<-76 dBc and HD2+3<-80 dBc. Phase variation between channels is better than +/-90ps (on the same range).
With the CS448 you can view the high side gate drive in a power switch as it is switching. Our CS1090 is designed to show this with FET switches that switch between 0 and 500V in about 10ns. The high side gate drive is therefore slewing at 50 kV/us. Here is the connection:
Using the Cleverscope4 application we can measure 4 channels (with one CS448) or 8 channels (with two CS448's trigger and clock linked) of isolated signals. This is the measured result from the CS1090 HV bridge:
The gates are slewing 0->500V in about 10ns while the measurement is made. Dead time is about 1.077us (Markers 1-2).
and then if we zoom in we can look at the transition itself:
and then if we zoom in we can look at the transition itself: