Datasheet

3
APPLICATION EXCELLENCE
Upper-side Gate Drive Voltage Measurement
A conventional HV differential probe will, at best, load the gate drive
signal and, at worst, cause circuit malfunction. The HVFO108 is
optimized for floating upper-side gate drive voltage measurements,
while rejecting interference from low-side device switching
transients .
Floating Control or Sensor Signal Measurements
The HVFO108 is ideal for measuring low voltage sensor voltages across its high impedance input leads. Its focus is to
reduce the total load on the device under test (DUT) and providing superior signal delity, noise and rejection.
Upper-side gate drive signal capture comparison –
HVFO capture (yellow): classic, textbook shape
HV differential probe (magenta): more loading and lower-side
device high dV/dt interference
Current sinking into half-bridge phase in cascaded H-bridge –
HVFO enables Miller effect to be observed clearly
HV Fiber-optically
Isolated Probe
Conventional HV
Differential Probe
The HVFO measures only the small signal voltage with high probe
input impedance; therefore, total DUT load is very small. Low tip
loop inductance and 140 dB CMRR provide superior signal delity,
noise and rejection.
The HV differential probe measures the full common mode + sensor
voltage. Therefore, the DUT load is ~100 times larger than with the
HVFO. This excessive load will impact the signal delity and may even
cause the circuit to malfunction.