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
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.
Powering Multiple DUTs In Parallel? Consider Individual Supplies
Agilent's Bob Zollo explains why you're better off powering multiple devices under test with individual supplies vs. one big supply.
Commentaries and Blogs
Guest Blogs
Nov 11, 2014
blog

How to Outsource Your Project to Failure 3

This article will address failure to carefully vet a potential manufacturing or “turnkey” partner and/or failure to transfer sufficient information and requirements to such a partner, a very common problem I have seen again and again with my clients over the years, and have been the shoulder cried upon by several relatives and clients in the past....More
Nov 11, 2014
blog

Transition from the Academe to the Industry Unraveled 1

There have been many arguments here and there about how short-comings of universities and colleges yield engineers with skill sets that do not cater to the demands of the industry. There have been many arguments here and there about an imminent shortage of engineers lacking knowledge in the sciences. There have been many arguments here and there about how the experience and know-how of engineers in the industry may vanish due to the fact that they can’t be passed on because the academic curriculum deviates from it....More
Nov 11, 2014
blog

Small Beginnings 5

About 10 years ago I received a phone call from an acquaintance. He had found a new opportunity selling some sort of investments and he wanted to share it with me in case I was interested. Ken had done fairly well for many years as a contract software developer primarily in the financial services sector. His specialty was writing RPG code. (RPG is often referred to as a write only language.) But he was seeing the handwriting on the wall as the industry moved on to other methods, and saw himself becoming a fossil....More

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