Bob Zollo

Solution Architect for Battery Testing, Electronic Industrial Solutions Group,
Keysight Technologies

Bob Zollo is solution architect for battery testing for energy and automotive solutions in the Electronic Industrial Solutions Group of Keysight Technologies. Bob has been with Keysight since 1984 and holds a degree in electrical engineering from Stevens Institute of Technology, Hoboken, N.J.


Generate Positive and Negative Voltage by Combining Two DC Sources 4
Using two unipolar dc supplies in an anti-series configuration is another approach for generating positive and negative voltage—and one that doesn't suffer from power interruption.
Generating Negative Resistance 2
When applying Ohm's Law to solve for voltage drop in batteries and dc power supplies, resistance must be positive, right? Not necessarily.
The Digital Side of DC Power
Though inherently analog, today's dc power supplies have digital characteristics and resemble HP's "One-Box Solution" supplies from the 1980s.
Getting Your Priorities Straight: Managing Overshoots 1
If voltage or current overshoots are a concern with your power supply, then choosing the right priority mode becomes essential.
Find and Fix Power-Supply Noise Issues When Charging Cells 1
Often times, standard power test equipment can be more flexible than dedicated cell testers when analyzing power supplies.
Understanding and Measuring Power-Supply Transient Recovery Time
A power supply's transient recovery time is crucial in numerous applications, such as power amplifiers, so it can be quite beneficial to develop a solid understanding of the parameter.
Power Analyzer Measures UPS Runtime 13
Using a power analyzer that can make single-shot measurements like a scope enabled the measurement of actual power consumption during a single cycle of a sump pump.
Measuring Power-Conversion Efficiency
Accurate measurement of power-conversion efficiency is paramount for reducing energy consumption, and the best method is to use a power analyzer.
Simulating a Battery with a Power Supply Reaps Benefits 3
When proving battery-powered device designs, a battery emulator reduces test setup time, creates a safer test environment, and provides more repeatable results versus using a real battery during test.
Measuring DC Motor Speed with a Power Supply 1
No special circuits or hardware are needed to determine the speed of a dc motor—instead, you can use the power supply that’s powering the dc motor (if it’s the right one) to accomplish the task.
Understanding the Pros and Cons of Overvoltage Protection 1
Understanding how overvoltage protection (OVP) works and when it may falsely trip or miss an overvoltage helps pinpoint the right OVP method to protect your device under test, based on what may happen in the test environment.
Watchdog Timers Safeguard Devices from Uncontrolled Power During Test
To protect your device against potentially hazardous uncontrolled ac or dc power, you may want to consider a watchdog timer.
Use A Power Supply As A High-Current Ohmmeter 2
What can you do if you want to measure the heating effects of a power device? Since the parametric analyzer cannot provide continuous high power to cause self-heating, a different approach is needed.
Measure Your Power Supply’s Low Current With A Shunt
Using a shunt is simple. Just select a shunt resistor of a known resistance, measure the voltage drop across the shunt, and use Ohm’s law to calculate the current.
Expect More Power In PXI, But Watch Out 1
Many test systems today are based on PXI, which offers a whole test system in one frame. PXI gives you high speed, small size, vendor interoperability, and a wide variety of available cards. But for dc power supplies, being squeezed into a PXI slot can pose a real challenge.