Measurement
Description
Voltage Source
Select which channel the voltage waveform is on.
Frequently, for these measurements, you will select a channel pair, where channel 1 is
used as a voltage source and channel 2 as a current source.
The Voltage and Current sources can be any analog waveforms, whether live channels or
references.
Current Source
Select which channel the current waveform is on.
Frequently, for these measurements, you will select a channel pair, where channel 1 is
used as a voltage source and channel 2 as a current source.
The Voltage and Current sources can be any analog waveforms, whether live channels or
references.
Frequency Reference
Select the source for the zero crossings for all Power Quality measurements and for
frequency.
Global Measurement Settings
Set reference levels, gating, samples, and Hysteresis level. See
Settings panel (Measurement configuration menu)
on page 112
Switching Loss Measurements panel (optional)
Measurement
Description
Voltage Source
Select which channel the voltage waveform is on.
Current Source
Select which channel the current waveform is on.
Gate Voltage (Vg)
Select which channel thet gate voltage is on.
Vg Polarity
Select the gate polarity.
Vg Ton Level
Set the gate Ton level. This control is only present when Gate Voltage (Vg) is set to
something other than None.
Conduction Calculation
Set the conduction calculation method. Voltage Waveform measures the voltage drop
across the switching device during conduction. Because this voltage is typically very small
compared with the voltage across the switching device when it is not conducting, you
generally cannot measure both voltages accurately at the same vertical setting of the
oscilloscope. In that case, consider using RDS(on) or Vce(sat) for more accurate results.
RDS(on)
RDS(on) is the best model for MOSFETs and is based on information from the device data
sheet. This value is the expected on-resistance between the drain and the source of the
device when it is conducting. This control is only present when Conduction Calculation is
set to MOSFET.
Vce(sat)
VCE(sat) is the best model for BJTs and IGBTs and is based on information from the
device data sheet. It is the expected saturation voltage from the collector to the emitter of
the device when it is saturated. This control is only present when Conduction Calculation is
set to BJT/IGBT.
Table continued…
Menus and dialog boxes
3 Series Mixed Domain Oscilloscope Printable Help
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