Datasheet
4
SUPERIOR PERFORMANCE AT LOWER VOLTAGES
120 V / 240 V Half-Bridge Circuit Topologies
Single-phase switch-mode power supplies and other devices utilizing half-bridge topologies need test and validation at
DC bus voltages up to 340 V
dc
with up to 680 V
p-p
on the input voltage. HVD310x probes are cost-effective solutions for
probing the wide range of high voltage signals present in these systems. “No Accessory (NOACC)” versions of these probes
permit additional cost savings. Use your existing accessories or purchase just the ones you want.
MOSFET/IGBT Devices
Gate Drive Voltage Measurements
Typically from 3 to 20 volts and “floating” at up to the DC
Bus voltage. Safe and accurate measurements require a
probe that is safety rated to the full DC bus voltage, has
low additive noise, excellent CMRR, and a suitable low-
voltage gain range with very high offset capability. The
HVD Series probes provide all of these capabilities.
Device Analysis
Conduction loss or Rds(on) measurements require a
voltage probing solution that has high CMRR, fast overdrive
recovery, voltage clamping (so the oscilloscope is not
overdriven), compensation flatness, gain/amplication to
see small signal details, and precise offset generation to
see the switching device’s turn-off performance. For this
type of analysis, the Teledyne LeCroy DA1855A Differential
Amplier is the best solution. It provides 100 MHz
bandwidth, excellent common mode rejection ratio (CMRR)
of 100,000:1 (typical), and overdrive recovery to within
100 mV from a 400 V input signal in less than 100 ns.
•
High precision - 1% accuracy
•
Automatic gain switching for optimum
performance
Input Voltage
(V
rms
or V
ac
)
Input Voltage
(V
pk-pk
)
DC Bus Voltage
(V
dc
)
Output PWM Voltage
(V
pk
)
120 340 170 170
240 680 340 340
DA1855A
Differential Amplier