Bob Zollo

Bob
Zollo
Product Planner, Power and Energy Division, Keysight Technologies,
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.

Articles
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 5
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? 12
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? 1
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 1
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 1
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.
Conquer The Challenges Of High-Current Pulses
Maintaining your bench supplies' output voltage in the face of rapidly changing or pulsed current draws is a stiff challenge. Agilent's Bob Zollo has some thoughts on how to solve the problem.
If Your Power Supply Needs Fast Rise And Fall Times, Try A Down-Programmer
When your bench supply's capacitors are all charged up with nowhere for that charge to go, an active down-programmer is a handy technique that brings rise and fall times back into a viable range.
Smart, Green Power Drives Changes In T&M Power Supplies
Agilent's Bob Zollo discusses how the green movement in the industry impacts power supplies used in testing applications.
Commentaries and Blogs
Guest Blogs
Dec 15, 2014
blog

Who Are You? (I Really Want to Know!) 4

Borrowing a stanza from The Who’s hit song seemed like a good way to bring attention to a critical topic often ignored by engineers. When finding information on a company that has an interesting product, what do we do? Of course, we look at its Web page to learn more....More
Dec 15, 2014
blog

Bridging Technical Communication Barriers Between Cultures

Understanding technical concepts in different languages can sometimes prove to be difficult, particularly when you have to communicate it. In this article, I discuss the challenges and possible courses of action....More
Dec 1, 2014
blog

Programming Efficiency 7

When I started college, the Intel 4004 was being designed. The C programming language and UNIX operating system were being developed (unbeknownst to me). I did most of my programming in BASIC on an HP 2100 series mini-computer....More
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