Top 22 Best Oscilloscopes [2022 Edition]

Top 22 Best Oscilloscopes [2022 Edition]

There are a few pieces of RF test equipment that are absolutely essential. In no particular order, the top 3 most important pieces of test equipment are an adjustable DC power supply, high quality digital multimeter, and a good oscilloscope. In this post we share 22 of the best oscilloscopes (or oscopes) available today (2022 Edition).

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Without further ado, here is our list of the Top 22 oscilloscopes for any budget:

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21 Best DC Power Supplies for Any Lab Budget

If there was a singular piece of test equipment that is absolutely vital, it would have to be a great DC power supply. This humble little box was the topic of a recent “Ultimate Guide to DC Power Supplies” post we did. At the end of that post, there were a handful of top DC power supply options that are extremely powerful. Given the importance and sheer range of options we wanted to do a dedicated list post to cover a broader set of DC power supply options.

To that end, we compiled a list of 21 great DC power supply options below.

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17 Best RTL-SDR Software Defined Radio Dongles [SDRs Reviewed]

Software Defined Radios (SDRs) are become more and more popular. This is partially due to the wide availability of low cost USB dongle SDR radios based on RTL2832U demodulator chipset. This is where the “RTL” in RTL-SDR comes from. While these low cost SDRs are not as capable as some of the higher performance SDR radios, they do offer a good bang for the buck. In this post we’ll take a look at 17 great RTL-SDR dongles.

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10 Common Power Supply Acronyms Explained

This post originally appeared on DesignSpark.

A good, low-noise power supply is an essential piece of test equipment whether you’re testing analog circuits, like audio amplifiers, digital circuits, like a new Arduino board, or RF circuits, like a new SDR radio. These vital pieces of test equipment supply clean voltages to your devices under test while having the option to limit things like current draw. There are many other protections built into the best DC power supplies, but these are often listed on spec sheets as confusing acronyms. In this post we will run through 10 common acronyms associated with power supplies and explain each of them in layman’s terms.

Let’s jump right in!

CC – Constant Current mode

Constant Current Mode (CC) is an operational mode of a power supply such that it outputs constant current. Constant current mode is typically engaged automatically when the power supply hits its current limit. When a power supply is operating in constant current mode, you’ll likely see the output voltage of your power supply drip lower than the set value

This may be a bit disorienting at first and may take you a second to figure out why your power supply is showing a lower voltage than you want, even if you try to adjust the voltage higher. When the current limit is reached, the device under test is trying to draw more current than beyond the limit. In order to limit the current, the power supply must reduce the voltage output to make everything balance… think Ohm’s Law.

If you unexpectedly see your DC power supply switch to CC mode, it’s best to power down and use a good multimeter to check for shorts or poor connections. Once you’re satisfied, you can report your device and slowly increase the current limit to see if you can get the DC power supply to switch back to constant voltage mode. Just be careful not to let the magic smoke out! 😉

CV – Constant Voltage mode

Constant Voltage mode (CV) is the ‘normal’ operating mode of a DC power supply. When operating in this mode, the power supply will produce a constant voltage output based on the voltage output setting. A power supply will operate in CV mode as long as the current limit is not violated. In this way, the power supply behaves like a voltage source by holding a constant voltage across the output terminals and the current will vary based on the draw from the circuit under test.

PSRR – Power Supply Rejection Ratio

Power Supply Rejection Ratio (PSRR) is a representation of a power supply’s ability to block or suppress noise from reaching the output terminals. For better noise rejection, the PSRR should be negative and the more negative, the more noise suppression. PSRR is important because it is a measure of how much noise injected into the input of the supply (from dirty power, or nearby equipment) can impact the stability of the output signal. Keysight has a great article detailing some of the unwanted signals that can cause noise in power supplies.

OCP – Over Current Protection

Overcurrent protection (OCP) is a mechanism for ensuring sensitive devices are not overloaded. Overcurrent protection is not independent of current limiting and actually works hand and hand with current limiting. Current limiting is engaged when the power supply is operating in constant current mode. Overcurrent protection is additional safeguard. When enabled, OCP will actually turn off the power supply completely after a specified time delay. This implementation ensures that temporary current spikes don’t cause the power supply to shut down completely. If OCP engages, typically it must be reset before the power supply output will be re-enabled. OCP is usually able to be turned off and on through a setting of the power supply.

OPP – Over Power (Overload) Protection

Over Power Protection (OPP) is a safeguard that protects the power supply from burnout caused by a short circuit or overload condition. While OCP and OVP are strictly guarding against over current and over voltage, OPP is a holistic protection that will shut the power supply output off if the power draw surpasses the maximum rated wattage.

OTP – Over Temperature Protection

Over Temperature Protection (OTP) is protection mechanism that monitors the internal temperature of the power supply and disables the output of the power supply if the internal temperature exceeds the limit. Unlike other protections like OCP, OTP cannot be disabled.

OVP – Over Voltage Protection

Over Voltage Protection (OVP) is a safeguard that is meant to protect sensitive devices. OVP works by monitoring the positive and negative terminals of the power supplies output. If the voltage exceeds a set limit, the output is either clamped or shut down entirely.

SCP – Short Circuit Protection

Short Circuit Protection (SCP) is similar to over current protection. When a short circuit is detected the power supply will ‘break’ the circuit and disable the output of the power supply.

SMPS – Switched Mode Power Supply

A Switched Mode Power Supply (SMPS) is a type of DC power supply that uses switching regulators to convert AC signals to DC outputs. Switched mode power supplies are typically more efficient than their linear power supply counterparts. The major drawback of these types of power supplies is that output noise that can appear as a result of the switching circuitry.

UVP – Under Voltage Protection

Under voltage protection (UVP) is a specialized type of power supply protection and therefore may not be found on every model. The primary purpose of UVP is to prevent the output voltage from falling below a user defined low-voltage limit. This is useful in certain applications such as discharging batteries. When the output voltage is lower than the limit, the power supply output will be disabled.

Looking for a great Power Supply?

We’ve written a MASSIVE GUIDE for DC Power Supplies and included our top DC power supply recommendations. If you’re looking to upgrade your power supply and aren’t sure what things you should be considering, this guide will point you in the right direction!

Ultimate Guide to DC Power Supplies [PLUS 4 Top DC Power Supplies]

A good DC power supply is one of the most essential pieces of test equipment for any lab.  In this post we’ll cover everything you could need to know about DC power supplies.  We’ll go through what they are, the different types of power supplies, how to choose the best DC power supply for your application or lab, and finally our recommendations on the right power supply for various budgets and use-cases.

Read all the way through our ultimate guide to DC Power Supplies. Or you can jump straight to our recommendations for the best DC Power Supplies below!

Looking for an even more complete list of great DC Power Supply options? Check out comprehensive list of over 20 adjustable DC power supplies.

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Top 5 Waveform Signal Generators (2021)

If you’ve landed on this page, chances are you already have a good idea what a waveform or signal generator does and why you’d need one.  You may even be close to deciding on a new unit for your lab.  If so, you’ve come to the right place!

We’ve compiled a list of 5 great signal generators, and they cover all different price points, so there’s bound to be something for every budget.

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Every Multimeter Measurement Explained

This article was originally published on Evaluation Engineering.

What is a multimeter?

A multimeter or digital multimeter (DMM) is one of the most essential and common pieces of lab equipment. Multimeters are used for taking basic electrical measurements related to Ohm’s Law.  This includes measurements like voltage, current, resistance, etc.  Multimeters can be both handheld or benchtop units.  Benchtop multimeters tend to offer higher precision than their smaller handheld counterparts.  For this purpose of this article, we’ll assume a benchtop multimeter is being used.

Without further ado, here is an explanation of every multimeter measurement.

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Live NOAA Weather with Nooelec GOES Weather SDR Bundle

Introducing a new SDR radio bundle specifically designed for tuning into weather satellite signals.

SDR Weather Stations

Using an SDR to receive weather data from NOAA’s GOES satellite constellation is one of the most common applications for software defined radio enthusiast. There are a ton of tutorials and videos on how to setup your SDR rig, antenna, and SDR software to receive and decode weather images.

One thing that can slow folks down on their quest for home-brew meteorology is figuring out just what equipment is needed beyond a great SDR radio. There are antennas, LNAs, filters, etc. It can all become a bit overwhelming at times.

That’s where a new SDR bundle from Nooelec comes in. The folks over at Nooelec have taken all the guess work and hours of sifting through forums out of designing the best SDR weather station. They’ve created a bundle that includes everything you need to receive weather satellite images.

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5 Myths about BGA Rework Stations [PLUS Real Considerations]

Of all the different situations a technician or electronics hobbyist can find themselves in… perhaps one of the most intimidating is needing to replace a bad BGA (Ball Grid Array) component on a board. Reworking BGAs is not for the faint of heart, which is probably why there are so many myths and misconceptions surrounding the topic. In this post, we’ll tackle 5 common myths about BGA Rework Stations and hopefully make you a bit more comfortable deciding to tackle that Xbox chip replacement or CPU upgrade.

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