Bob Zollo

Product Planner, Power and Energy Division,
Keysight Technologies

Bob Zollo is product planner in the Power and Energy Division of Keysight Technologies. Bob has been with Keysight since 1984 and is responsible for Keysight's power products roadmap. He holds a degree in electrical engineering from Stevens Institute of Technology, Hoboken, NJ.

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.
Why Can’t You Put Electronic Loads In Series To Get More Voltage?
As voltages climb to 400 V, 600 V, or even 1000 V, fewer e-loads are on the market rated for these high voltages. You may consider putting e-loads in series to construct a solution. But most, if not all, e-loads on the market cannot be safely put in series.
Capacitors Create Challenges When Modulating DC Power 2
When changing the voltage on capacitors, you need to consider how much current will be required. And that current can grow quite large as the capacitor gets large or as the desired rate of change of voltage gets large.
Do You Have Enough AC For Your DC? 5
When you need 2000 W of dc power for your testing, you may not think too much about where it will come from. But in the U.S., when operating from the typical and ubiquitous 120-V ac outlet, you might not get enough power off the ac line to generate 2000 W or even 1000 W out of your dc power supply.
What Is An Autoranging Power Supply?
Autoranging power supplies, sometimes simply called autorangers, are designed to provide a greater range of operation than a typical supply. If the maximum volts times maximum amps is greater than maximum watts, you have an autoranger.
Bipolar Power Supplies Run The Voltage Gamut
Agilent's Bob Zollo discusses the varieties of bipolar power supplies for circuit testing applications and their advantages and disadvantages.
Turn Positive Voltages Negative With Relays
In some applications, it’s necessary for the voltage to be positive for some parts of the test and negative for others. Agilent's Bob Zollo reviews considerations for using relays to switch isolated power supplies during testing.
Commentaries and Blogs
Guest Blogs
Nov 16, 2015

Building Home or Very Small Office Electronic-Circuit Prototypes, Part 2 5

Part 2 gives step-by-step instructions on how to turn a Black & Decker TO1675B convection countertop oven into a temperature-controlled reflow oven....More
Oct 7, 2015

Building Home or Very Small Office Electronic-Circuit Prototypes, Part 1 10

This first part in a series goes through the steps of creating a preliminary design for a small and inexpensive hobbyist/limited-technology-prototype build-and-test capability....More
Sep 16, 2015

What is All This Nanogenerator Stuff, Anyway?

Nanogenerators, which harvest energy from the environment, could be the next big thing in renewable energy....More

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