HVFO
High Voltage
Fiber Optically-
isolated Probe
Key Features
Applications
Upper-side gate drive signal
measurements
Floating control signal or sensor
voltage measurements
EMC, EFT, ESD, and RF immunity
testing and system optimization
Any small signal measurements
with high common-mode voltage
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The HVFO is an affordable, optimally designed probe for measurement
of small signals floating on an HV bus in power electronics designs or
for EMC, EFT, ESD, and RF immunity testing sensor monitoring.
It far surpasses the measurement capabilities and signal fidelity of
both conventional HV differential probes and acquisition systems
that rely on galvanic high voltage isolation. Furthermore, it mitigates
the need to rely on dangerous test setups that require floating the
oscilloscope and probe.
60 MHz bandwidth
35 kV common-mode voltage rating
(fiber optic isolation)
Superior Noise and Rejection
140 dB CMRR
Low loop inductance
Low attenuation
Optical Isolation is Best
Optical isolation between the probe
tip and the oscilloscope input reduces
adverse loading of the DUT, provides
faithful pulse response, and increases
confidence in the measurement. Safety
against dangerous high voltage levels
can be ensured and unsafe “floating” of
the oscilloscope can be avoided.
Compact, Simple, Affordable
The HVFO103 is small enough to fit
in tight spaces, provides just enough
performance for real-world needs, and
is affordable enough to fit the tightest
of equipment budgets.
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Reduced DUT loading, better pulse
response compared to conventional
HV differential probes
Selectable tips from ±1V to ±40V
Eliminates need to “float” the
oscilloscope
ProBus-compatible with many
Teledyne LeCroy oscilloscopes
Applications
The HVFO is ideal for measuring low
voltage (1 to 40V) signals floating on
a HV bus, such as in-circuit upper-side
gate drive signals and low voltage
control, sensor, or sense resistor
signals. The probe is also suitable for
EMC immunity testing in which a device
operation must be monitored in the
presence of disturbance signals.
Superior Noise Rejection
High CMRR (140 dB) provides more
accurate representation of the
measured signal despite the presence
of high dV/dt or dA/dt events elsewhere
in the circuit. The test lead is optimized
to limit loop inductance and radiated
pickup. Tip attenuations are optimized
for a wide range of signal amplitudes.
OPTIMIZED FOR SMALL SIGNAL FLOATING MEASUREMENTS
The HVFO provides capability to measure your signal
as it truly is, in-circuit, without compromise.
Upper-side gate drive
signals will be faithfully reproduced without loading and distortion or mysterious ringing, overshoots and transients,
providing a clear view of the Miller effect on the gate drive signal. AC and DC sensor signals floating at a high voltage
or in the presence of EMC, EFT, ESD, and RF disturbance signals can be acquired with high signal fidelity and correctly
correlated to in-circuit and control activities.
The HVFO architecture is simple - a single laser and fiber optic cable is used for optical isolation and modulated
signal + data communication, and multiple tips achieve different operating voltage ranges.
Amplifier/Modulating Transmitter
A frequency modulating optical
transmitter is used for signal and
data transmission across a fiber
optic cable.
Battery-powered
A long-life Li-Ion battery provides
power for ~6 hours of use.
Re-charging is via a standard USB
micro-B charging interface.
Selectable Attenuating Tips
Use one of three available tips for
voltages from ±1V to ±20V
(±40V tip available in the near future).
Built-in Safety
The USB micro-B interface
also serves as the connection
for the attenuating tip to
preclude charging during
circuit connection.
Flexible Connection to DUTs
Simplified pin socket termination for
connection to square pins, solder-in
terminals, or grippers..
Coaxial Signal Connection
A noise immune coaxial cable
(blue) is used to connect to
the voltage signal.
Fiber Optic Cable
A 1m long cable is provided
(a 2m and a 6m long cable is
optional). Even longer cables
may be supplied by the user.
De-modulating Receiver
The optical signal is received
and demodulated to an electrical
output to the oscilloscope with
correct voltage scaling.
Reference and Shield
Connection
Separate connections are
provided for Shield (black)
and Reference (green). The
Reference wire carries the
signal return current and
the Shield carries current
associated with the stray
parasitic capacitances.
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APPLICATION EXCELLENCE
Upper-side Gate Drive Voltage Measurement
An upper-side device has an applied gate voltage floating above
ground. Any conventional HV differential probe with high tip
capacitance in parallel with C
GE
or C
GS
, and/or high impedance
and large loop inductance in series with the gate drive impedance
will at best load the gate drive signal and at worst cause circuit
malfunction. Measurement interference from the low-side device
switching can also interfere with proper upper-side gate voltage
measurement. The HVFO is optimized for the best upper-side gate
drive voltage measurements.
The HVFO (yellow trace) and a conventional HV differential probe
(magenta trace) capture an upper-side gate drive signal. The HVFO
exhibits a classic, textbook shape while the HV differential probe has
more loading and lower-side device high dV/dt signal interference.
In this upper-side gate drive measurement, the gate drive is captured
when current is sinking into the half-bridge phase in a cascaded
H-bridge. The Miller effect can be clearly observed.
Floating Control or Sensor Signal Measurements
The HVFO measures only the low voltage sensor voltage across its high impedance input leads. Total load on the device
under test (DUT) is very small. Furthermore, the low lead loop inductance, >100dB CMRR, and low attenuation provide
superior signal fidelity, noise and rejection.
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 fidelity,
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 fidelity and may even
cause the circuit to malfunction.
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SPECIFICATIONS & ORDERING INFORMATION
Bandwidth
Rise Time (10-90%)
Input Dynamic Range
60 MHz (typical, with tip attached)
7.5 ns (typical)
±1V, ±5V, ±20V, ±40V (DC+peak AC) respectively with 1X, 5X, 20X or 40X attenuating tips.
All tips are purchased as accessories (none are included with HVFO103 probe).
Maximum Non-destruct Voltage
5 times the operating voltage rating (tip dependent)
Common Mode Voltage Range
±35 kV (DC+Peak AC) (not for hand-held use, with adequate spacing between probe components and earth ground)
Maximum Input Voltage to Earth
±35 kV (DC+Peak AC) (not for hand-held use, with adequate spacing between probe components and earth ground)
Maximum Safe Input Voltage
For hand-held use, 30 Vrms / 60 Vdc per IEC/EN 61010-031:2015
Offset
Offset capability determined by oscilloscope offset available in a given gain (V/div) setting after accounting for total
probe attenuation (total probe attenuation is twice the tip attenuation).
Sensitivity
50 mV/div to 1 V/div (1X tip), 250 mV/div to 5 V/div (5X tip), 1 V/div to 20 V/div (20X tip), 2 V/div to 40 V/div (40X tip)
Gain Accuracy
2% (LF, guaranteed)
Input Impedance
1 MΩ || 34 pF (1X tip); 5 MΩ || 26 pF (5X tip); 10 MΩ || 22 pF (20X tip); 10 MΩ || 22 pF (40X tip)
Input/Output Coupling
DC only
Interface
Cable Length
Battery
ProBus
1.25 m (4.1 feet) from input lead to oscilloscope connection (using included 1 meter fiber optic cable)
6 hour battery life (typical). 1.5 hour re-charge time (typical, with user-supplied dedicated USB charger).
3 hour re-charge time (typical) using supplied USB charging cable connected to oscilloscope USB port
140 dB (100 Hz), 120 dB (to 1 MHz), 85 dB (to 10 MHz), 60 dB (to 60 MHz)
7 mVrms (1X tip), 35 mVrms (5X tip), 140 mVrms (20X tip), 280 mVrms (40X tip)
8 kV contact discharge and 10 kV air discharge per IEC61000-4-2, criteria A
25 V/m (80 MHz to 2.7 GHz) per IEC61000-4-3, criteria A
10 V/m (150 kHz to 80 MHz) per IEC61000-4-6, criteria A
Electrical
CMRR (typical)
Noise (Probe only)
Electrostatic Discharge (ESD)
Immunity
Radiated RF Electromagnetic
Field Immunity
Immunity to Conducted Distur-
bance Induced by RF Fields
Temperature
Humidity
Altitude
Pollution Degree
CE Declaration of Conformity
Noise, Rejection, and Electromagnetic Compatibility (EMC)
Environmental
Certifications
0°C to 50°C (operating), -20°C to 70°C (non-operating)
5% to 80% RH (non-condensing) up to 30°C, decreasing linearly to 45% RH at 50°C (operating)
5% to 95% RH (non-condensing), 80% RH above 30°C, 45% RH above 50°C (non-operating)
Up to 3000 m (operating), 10,000 m (non-operating)
2, Indoor Use Only
Low Voltage Directive 2014/35/EU (IEC/EN 61010-031:2015
EMC Directive 2014/30/EU (IEC/EN 61326-1:2013)
RoHS2 Directive 2011/65/EU
Ordering Information
Product Description
High Voltage Fiber Optically-isolated Probe Models and Accessories
Product Code
HVFO103
HVFO100-1X-TIP
HVFO100-5X-TIP
HVFO100-20XTIP
HVFO100-40X-TIP
HVFO103-XMITTER
HVFO-1M-FIBER
HVFO-2M-FIBER
HVFO-6M-FIBER
HVFO103-CCNIST
High Voltage Fiber Optic Probe, 60 MHz Bandwidth. Includes soft-carrying case, Qty. 1 Amplifier/Modulating Transmitter, Qty. 1
Demodulating Receiver, Qty. 1 1m Fiber Optic Cable, Qty. 1 USB Charging Cable, Qty. 1 Micro-gripper set.
Attenuating Tips must be ordered separately.
±1V (1x) Attenuating Tip
±5V (5x) Attenuating Tip
±20V (20x) Attenuating Tip
±40V (40x) Attenuating Tip
Spare Amplifier/Modulating Transmitter (permits constant operation - charge one while another is being used)
1m Spare Fiber Optic Cable Accessory
2m Fiber Optic Cable Accessory
6m Fiber Optic Cable Accessory
NIST Traceable Calibration Certificate
Customer Service
Teledyne LeCroy oscilloscopes and probes are designed, built, and tested to ensure high reliability. In the unlikely event you experience difficulties,
our digital oscilloscopes are fully warranted for three years and our probes are warranted for one year. This warranty includes:
No charge for return shipping
Long-term 7-year support
Upgrade to latest software at no charge
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1-800-5-LeCroy
teledynelecroy.com
Local sales offices are located throughout the world.
Visit our website to find the most convenient location.
hvfo-probes-ds-04may17
© 2017 Teledyne LeCroy, Inc. All rights reserved. Specifications, prices, availability, and delivery subject to change without notice.
Product or brand names are trademarks or requested trademarks of their respective holders.
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