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Minimize noise from power supplies when making low-level measurements

Written on August 1, 2017 at 7:22 am, by

Low-level measurements are susceptible to noise from a number of different sources. While discussing all the ways that noise can degrade low-level measurements is outside the scope of this article, let’s at least consider how to make sure that your test system power supply is not a problem:

  1. Start with a low-noise power supply. The first step to ensuring that noise doesn’t affect your test system’s low-level measurements is to use a low-noise power supply. In general, linear power supplies are less noisy than switching power supplies, and this makes them a better choice for powering test systems that must make low-level measurements. The Sorensen XT Series, for example, has an output noise and ripple specification of less than 1 mV.
  2. Use shielded cable to connect the power supply to a load. You can minimize the radiated noise picked up by the power supply leads by using twisted-pair, shielded cable for both the output and remote sense leads, as shown in the figure below.

    Connect the shield to ground at one end only, preferably the single-point ground on the supply, as shown. Another thing that you can do to reduce noise pickup is to use a common-mode choke in series with the output leads and a shunt capacitor from each lead to ground.

  3. Avoid imbalances in load lead inductance. By using shielded, twisted-pair cable to connect the supply to the load, you ensure that the leads are the same length, which helps you avoid any imbalance in the leads. Directly connecting the cable to the DUT also helps you avoid any imbalance..
  4. Eliminate ground loops. Another way to minimize conducted noise is by eliminating ground loops. The system should have only one connection to ground. In rack systems, where you have multiple ground points, keep the DC distribution path separate from paths that carry other ground currents. If necessary, you can isolate the power supply from ground. The Sorensen XT Series offers isolated outputs that make this easy to do.
  5. Use a bypass capacitor at the load to smooth voltage spikes. If your load rapidly changes the amount of current drawn from the supply, it may cause voltage spikes. Adding a bypass capacitor close to the load will help reduce those spikes.. The capacitor should have a low impedance at the highest testing frequencies.

For more information on reducing noise in your test system, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

How do electronic loads work?

Written on August 1, 2017 at 7:20 am, by

Electronic loads are used in a variety of tests, including power supply tests and battery tests. You can program them to provide exactly the kind of load that you need for the device you are testing.

One of the most common ways to use an electronic load is in the constant current (CC) mode. In this mode, the electronic load will draw a constant current from the device under test (DUT), no matter what the output voltage is. The figure below shows a simplified schematic of an electronic load to illustrate how the CC mode works.

Current from the device under test flows through both the power FET and the current shunt resistor. The voltage across the shunt resistor is compared to a voltage reference and the difference between the two is used to control the drain-to-source resistance, RDS, of the power FET. If the load current is higher than the desired constant current, the circuit will adjust the FET’s gate voltage to increase RDS and thus reduce the load current. If the load current is lower than the desired constant current, the circuit will adjust the gate voltage to reduce RDS, and the load current will increase.

In an actual electronic load, VREF is supplied by a digital-to-analog converter (DAC). The user sets the DAC output voltage to yield the desired constant-curent level. The CC accuracy specification is largely determined by the accuract of the digital-to-analog converter used in this circuit.

Constant-voltage mode
Most electronic loads also offer a constant-voltage (CV) mode. In this mode, the electronic load will maintain a constant voltage across the device under test. You would use this mode to test a battery charging circuit. The figure below shows a simplified schematic for an electronic load operating in constant-voltage mode.

In CV mode, the feedback signal is generated by a precision voltage divider. This signal is again compared to a voltage reference, and the output of the comparator is used to increase or decrease the RDS of the power FET. This basically changes the input impedance of the electronic load, allowing it to maintain a constant voltage across the input terminals, no matter how much current it is sinking.

Just like the CC mode, VREF is normally supplied by a digital-to-analog converter. Changing its output will change the CV value.

Modern electronic loads also offer constant-resistance (CR) and constant-power (CP) modes. The circuits used to implement these modes are usually some variation of the circuits used for the CC and CV modes. For more information on how electronic loads work, and how to use them in your applicaton, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

 

Get the Rev Right When Running MIL-STD-704 Test

Written on July 25, 2017 at 1:46 pm, by

As noted in an earlier blog post, the tests you run to ensure that airborne utilization equipment is compatible with an aircraft’s power system are specified in a series of MIL-HDBKs, specifically MIL-HDBK-704-1 through MIL-HDBK-704-8. To run these tests, a sophisticated power source is essential to simulate various power conditions. In addition, you also need whatever equipment is required to monitor the unit under test (UUT) while running the test.

Recognized as a world leader in programmable power, AMETEK Programmable Power has provided test equipment for compliance tests for airborne utilization equipment for decades. Over the years, we’ve updated our systems to cover the latest versions of MIL-STD-704 and to make our test equipment more effective and easier to use. Our MIL-STD-704 test solutions are in use by customers in U.S. and in countries all over the world.

Rev. F doesn’t negate earlier versions

Although the latest version of MIL-STD-704 is rev. F, you may have to run tests that comply with previous versions of the standard. The reason for this is that aircraft platforms tend to have a long life, and the power systems in those aircraft may be designed to comply with an earlier version of MIL-STD-704. When testing the utilization equipment for a particular platform, then, it’s imperative that you know what revision of MIL-STD-704 that the aircraft platform was designed to comply with.

The early versions of MIL-STD-704 specified the requirements for fewer types of power systems than the later revisions. Rev. A, for example, described the requirements for only three aircraft electric power systems:

  • three-phase 115V/400Hz AC,

  • single phase 115V/400Hz AC for devices requiring less than 500VA, and

  • 28V DC.

In rev. B, the authors added requirements for the 270V power system.

In rev. F, there are specifications for seven different power systems. In addition to the four already mentioned, rev. F includes specifications the following aircraft electric power systems:

  • single-phase, 115V/360-800Hz various frequency,

  • three phase 115V/360-800Hz various frequency, and

  • single-phase 115V/60Hz to power commercial, off-the-shelf (COTS) equipment.

Figure 1. Select the MIL-STD-704 version as needed.

Because utilization equipment may have to comply with earlier versions of MIL-STD-704, AMETEK Programmable Power’s test solutions allow users to easily select the appropriate version of the specification when setting up the test. As shown in Figure 1, test engineers and technicians, simply choose the appropriate revision from a drop-down menu.

Figure 2. Select the appropriate power group.

The next step is to choose the type of power that the power source is to supply to the utilization equipment. This is done by selecting one of the power groups as shown in Figure 2.

MIL-HDBK-704-1 through MIL-HDBK-704-8 specify the acronyms used for the seven power groups. They are:

  • SAC (single phase 115V/400Hz),

  • TAC (three phase 115V/400Hz),

  • SVF (single phase 115V various frequency),

  • TVF (three phase 115V various frequency),

  • SXF (single phase 115V/60Hz),

  • HDC (270V DC), and

  • LDC (28V DC).

Once these have been selected, the power source will supply power that simulates the various operating conditions as specified in MIL-STD-704. These include normal, transfer, abnormal, emergency, electric starting and power failure conditions. When subjected to these power conditions, the utilization equipment is expected to operate normally and perform to specifications.

These documents, including MIL-STD-704 (revisions A through F) are available online at EverySpec.Com. For information on how to use AMETEK power sources to run MIL-STD-704, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

Know Your Power Supply Jargon: Ripple

Written on July 14, 2017 at 8:06 am, by

AMETEK Programmable Power DC power supplies convert AC power to DC power. While our supplies are very good at doing this, they’re not perfect. On the output, there will be some small amount of AC still present. This is called ripple.

Minimizing ripple is important because excessive ripple because it can have adverse effects on the systems or circuits that a supply is powering. It can for example, cause measurement errors when a supply is powering instrumentation circuits or cause distortion when power audio circuits.

To see how ripple occurs, let’s take a look at a simple linear power supply. Linear supplies generally use a transformer to convert 120 VAC or 240 VAC mains power to a lower AC voltage. That AC voltage is then rectified to convert the AC to DC. A full wave rectifier will convert the AC voltage to the DC waveform shown as a dashed line in Figure 1.

To smooth that voltage we can put a filter capacitor across the output of the rectifier. It will charge when the rectified voltage is increasing and discharge when the rectified voltage is decreasing, but not discharge to zero. The voltage across the filter capacitor is shown as the orange line in Figure 1. The peak-to-peak value of the AC component of the voltage across the capacitor is the ripple voltage. The addition of a choke and a second capacitor to for a low-pass pi filter will reduce the ripple even more.

Of course, AMETEK Programmable Power supplies use much more sophisticated circuits to filter and regulate the output voltage. Our linear supplies, for example, use semiconductor voltage regulators to nearly eliminate ripple. The Sorensen XT Series, for example, has an output noise and ripple specification of less than 1 mV.

On most AMETEK Programmable Power data sheets, you’ll find noise and ripple combined into a single specification. Noise is any added and unwanted electronic interference, and it’s difficult to really differentiate how much of the unwanted output variation is due to ripple and how much is added noise. In switching power supplies, the measurement is given as a peak-to-peak voltage, indicating how much the output voltage can deviate from the nominal value.

For more information on power supply ripple, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

RS Series high-voltage option eases PV inverter testing

Written on July 14, 2017 at 8:02 am, by

As the number of photovoltaic power-generation systems continue to increase, the requirements for photovoltaic inverters are evolving as well. Conventional electrical characteristics such as over-voltage, over-frequency, anti- islanding intended to verify the inverter’s ability to tolerate power grid fluctuation are changing to meet varying requirements of the modern grid. In addition, the introduction of new requirements for low voltage ride through, high voltage crossing, and reactive power injection mean the inverter must be able to provide appropriate compensation when these grid conditions occur.

To aid in the development and testing of the photovoltaic inverters, you can use powerful bi-directional AC power sources to simulate different power-grid conditions. To perform the required tests, the AC power sources or grid simulators must have a wide output voltage range or multiple output voltage ranges to accommodate the output voltages of different photovoltaic inverters.

Photovoltaic inverters can have output voltages of up to 800 VAC L-L (461 VAC L-N) and when testing high line conditions, the power source may have to output more than 1100 VAC L-L (635 VAC L-N).

When equipped with one of several different high voltage options, AMETEK’s RS Series AC power source can supply the necessary voltages. These options give the RS Series an additional voltage range with built-in hardware that eliminates the need for additional transformers to step up voltages to simulate the power grid. With this option, the RS Series can supply up to 650 VAC L-N (XV650).

HV and XV Options

The XV and HV high voltage options give the RS Series use internal autotransformers that step the voltage up to the desired level. There are several different options available, depending on the desired maximum output voltage, including:

  • HV – 400 VAC L-N, 75 A
  •  XV500 – 500 VAC L-N, 60 A
  • XV600 – 600 VAC L-N, 50 A
  • XV650 – 650 VAC L-N, 46.2 A

With the XV650 option, an RS Series power source can supply up to 1,125 VAC L-L.

HVC and XVC Options

The HVC and XVC options are similar to the HV and XV options, but provide constant power output down to 80% of the maximum output voltage. At 80% of the maximum output voltage, an RS series power source can actually supply 125% of the maximum current supplied by an RS Series power source with an HV or XV high voltage option. See the figure below.

For example, an RS Series power source with the XV650 option has a maximum current output of 46A at 650 VAC. At 80% of maximum, or 520 VAC, the maximum available output current is still just 46A. With the XVC650 option, however, the RS Series power source can supply up to 57 A. The HVC and XVC options include:

  • HVC – 400 VAC L-N, 93.8 A
  • XVC500 – 500 VAC L-N, 75 A
  • XVC600 – 600 VAC L-N, 62.5 A
  • XVC650 – 650 VAC L-N, 57.7 A

Field Installation and Custom Ranges

The HV, XV, HVC, and XVC options can all be installed in the field. Please contact AMETEK Programmable Power to evaluate your upgrade options. AMETEK Programmable Power can also supply custom high-voltage voltages ranges. To inquire about a custom voltage range that is not listed, please contact us at ci.ppd@ametek.com

For information on the RS Series AC/DC power sources or the high voltage options, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

Choose the Right Gauge Wire Size for Your Application

Written on June 8, 2017 at 12:26 pm, by

When installing an AMETEK Programmable Power power source, you must properly size the wires you use to connect the AC input power to the power source and the AC or DC output to the load. Selecting the right size gauge wire will ensure that your power source will operate efficiently and reliably.

The tables below will help you determine the appropriate wire size for both the input and output connections. Table 1 gives minimum recommended gauge wire size for copper wire operating at a maximum of 30° C ambient temperature. The data in this table comes from the National Electrical Code, and is for reference only. Local codes can impose different requirements, so make sure to check them before making a final installation. To handle higher currents, wires can be paralleled; refer to the National Electrical Code for guidelines.

Table 1.

There are two main reasons for choosing the right size wire for the load. The first reason is to ensure that the cable can safely carry the maximum load current without overheating, which may present a fire hazard or cause the insulation to degrade. The second reason is to minimize the IR voltage drop across the cable. Both of these phenomena have a direct effect on the quality of power delivered to and from the power source and corresponding loads.

If the ambient temperature of the installation is greater than 30° C, consider using a larger gauge wire than shown in Table 1. The ability of a wire to carry current, also called its ampacity, decreases as the ambient temperature increases. So, use short cables with a larger gauge wire than shown in Table 1. And, if power cables are to be bundled with other cables, you may have to derate even further, as the operating temperature inside the bundle may be higher than the ambient temperature.

Also, be careful when using published commercial utility wiring codes. These codes are designed for the internal wiring of homes and buildings, and while they do take into account safety factors, such as wiring loss, heat, breakdown insulation, and aging, they allow a voltage drop of 5%. Such a high voltage drop may not be acceptable in your application.

In high performance applications where loads draw high inrush or transient currents, make sure to consider the peak currents that the cables may have to accommodate. These peak currents may be up to five times the RMS current values. An underrated wire gauge adds losses, which alter the inrush characteristics of the application and thus the expected performance.

Table 2 shows the ampacity, resistance per 100 ft, and voltage drop per 100 ft. at the rated current, at an ambient temperature of 20° C. Copper wire has a temperature coefficient of α = 0.00393Ω/°C at t1 = 20°C, so that at an elevated temperature, t2, the resistance would be R2 = R1 (1 + α (t2 – t1)).

Table 2.

The output power cables must be large enough to prevent the line voltage drop (the sum of the voltage drops across both output wires) between the power source and the load from exceeding the remote sense capability of the power source. Calculate the voltage drop using the following formula: Voltage Drop = 2 × distance-in-feet × cable-resistance-per-foot × current.

For more information on right gauge wire for your application, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

Ensure Avionics Reliability with MIL-STD-704 Tests

Written on June 8, 2017 at 12:20 pm, by

To ensure that aircraft electronics and other electrically-powered equipment will operate reliably once in the air, you must test them under extreme power conditions. In the military world, MIL-STD-704 (now up to rev. F), “Aircraft Electric Power Characteristics,” establishes the requirements and characteristics of aircraft electric power. This standard is not only used by the U.S. military and military contractors, but has also been adopted, either directly or indirectly, worldwide. For example, the Chinese standard, GJB 181, Characteristics of aircraft electrical power supplies and requirements for utilization equipment, is largely based on MIL-STD-704.

MIL-STD-704 actually defines the power characteristics of an aircraft electric power system, not the test requirements. Section 5.2, for example, describes AC power characteristics. 5.2.1 says, “AC systems shall provide electrical power using single-phase or three-phase wire-connected grounded neutral systems. The voltage waveform shall be a sine wave with a nominal voltage of 115/200 volts and a nominal frequency of 400 Hz.” It also describe three alternative power systems, including a variable frequency system, a double-voltage system and a single-phase, 60 Hz system. Section 5.2 goes on to describe the phase sequence for three-phase systems, normal operation, abnormal operation, and emergency operation characteristics. A series of tables lists the specifications.

Even though we call the tests performed to ensure that equipment will perform properly on board an aircraft “MIL-STD-704 tests,” the standard does not describe any tests. For guidance on testing, there is a series of handbooks that specify tests for different types of input power. These include:

  • MIL-HDBK-704-1, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics

  • MIL-HDBK-704-2, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, Single Phase, 400 Hz, 115 Volt

  • MIL-HDBK-704-3, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, Three Phase, 400 Hz, 115 Volt

  • MIL-HDBK-704-4, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, Single Phase, Variable Frequency, 115 Volt

  • MIL-HDBK-704-5, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, Three Phase, Variable Frequency, 115 Volt

  • MIL-HDBK-704-6, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, Single Phase, 60 Hz, 115 Volt

  • MIL-HDBK-704-7, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, 270 VDC

  • MIL-HDBK-704-8, Guidance for Test Procedures for Demonstration of Utilization Equipment Compliance to Aircraft Electrical Power Characteristics, 28 VDC

These documents, including MIL-STD-704 (revisions A through F) are available online at EverySpec.Com. For information on how to use AMETEK power sources to run MIL-STD-704, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

Modern Power Supplies Help Reduce Test Costs

Written on May 24, 2017 at 7:57 am, by

Test costs can add considerably to overall manufacturing costs, especially when extensive testing is required. That’s why it’s important to keep test costs to a minimum. Reduced test costs translate to lower manufacturing costs. Modern power supplies, such as California Instruments’ Asterion Series, have several features that can help you reduce test costs:

Faster command processing times
Because modern power supplies use more sophisticated processors, they can process commands faster than earlier generations of power supplies. Reducing command processing times means reduced test times, and that helps lower test costs.

Command processing times are not often specified for power supplies, but there is a test that you can perform to compare the command processing times of different power supplies. What you do is program a power supply to go from 0 V to some particular value and measure the time from the point at which you send the command to the time the power supply voltage reaches the target value.

While this test is not measuring just the command processing time, it will allow you to compare the performance of several different power supplies. Perform a similar test for other commands and you can get a better feel for how the power supply will perform in your application.

Built-in measurement capabilities
Built-in measurement capabilities can also help you shave test times. Communicating with a single instrument, such as a power supply with measurement capabilities, instead of multiple instruments, such as a power supply and system DMM, can save overall test time. An added benefit of using a power source with measurement capability is that the test system design is simpler, and because you’re using fewer instruments and less cabling, the test system should be more reliable, too.

Advanced software commands
Many tests require a power supply to step through a series of different outputs during the test. While it is possible to program each of these steps individually from the control computer, a much more efficient and time-saving way is by using what’s commonly called the list function.

Too see how this works, refer to Figure 1. It shows a typical series of output voltages that you might generate using the list function. It includes three different AC voltage steps: 160 volts for 33 milliseconds, 120 volts for 83 ms, and 80 volts for 150 ms, separated by three intervals of zero volts for 67 ms. The list specifies the pulses as three voltage points (point 0, 2, and 4), each with its corresponding dwell points. The intervals are three zero-voltage points (point 1, 3, and 5) of equal time duration. In addition to the different output voltages, you can also set a count parameter, which specifies how many times the power supply will output the sequence.

Figure 1.

The point here is that you set up this sequence with a single command instead of a series of commands, and by doing so, you save test time.

These are just three ways that modern power supplies help you reduce test costs. For more information on how AMETEK power supplies help you reduce test, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

Know Your Power Supply Jargon: Isolation

Written on May 24, 2017 at 7:51 am, by

The Sorensen XBT Series is one of AMETEK Programmable Power’s lines that offer isolated outputs.

Many AMETEK Programmable Power products offer isolated outputs. In this blog post, we’re going to discuss what power supply isolation means and why this characteristic is desirable.

An isolated power supply has a power output that is electrically independent of its power input. That is to say that there is no connection between the power input and the power output. When a power supply has multiple isolated power outputs, it means that the output voltages are independent of one another and there is no connection between the outputs.

There are several reasons why you might want to select a power supply with isolated outputs:

  1. Safety. Safety is perhaps the most important reason for a power supply’s outputs to be isolated from the AC supply voltage. Isolation prevents AC mains voltage from being present on the output. This is the reason that isolation is of extreme importance for power supplies used in medical equipment. IEC 60601-1: Medical electrical equipment – Part 1: General requirements for basic safety and essential performance is the standard that spells out requirements for power supplies used in medical applications.

  2. Flexibility. Benchtop power supplies with multiple, isolated outputs, such as the Sorensen XBT Series, offer users the most flexibility. The XBT’s isolated supplies can easily be connected in series to obtain higher output voltages or in parallel to obtain higher output currents.

  3. Ground loop prevention. Another reason to use an isolated power supply is to prevent ground loops. Ground loops occur when two or more circuits share a common return path. When your system has a ground loop, current flowing in the loop can cause one or more of the circuits to malfunction. Using an isolated power supply breaks the ground loop and prevents this interaction from happening.

Isolation between power input and power output or between two power outputs is never 100%. Insulators, for example, are not perfect and are conductive to some degree. This conductivity results in a leakage current. Insulators also have a finite breakdown voltage.

Other characteristics that reduce the level of isolation between two circuits are stray capacitance and mutual inductance. There is, for example, stray capacitance between the primary and secondary windings of a transformer, and this capacitance reduces the level of isolation between the power input and power output. Mutual inductance can also reduce the level of isolation between two circuits. If this is a problem for you, the solution is to increase the distance between the two circuits.

There are two ways to measure isolation between two circuits. One way is to measure the resistance. Because the resistances are so high—20 Mohms or more—you may need more than just a typical multimeter to make this measurement. Another way to measure isolation is to perform a “Hi-Pot” test. To run this test, you apply a high DC or an AC voltage across the two circuits and measure the leakage current. There are testers specifically designed to run this test.

In addition to isolated outputs, you might also want to consider whether or not a supply’s control inputs—both analog and digital—are isolated. Isolated inputs will help ensure that control circuits don’t affect the power supply output and vice versa. For more information on power supply isolation, contact AMETEK Programmable Power. You can send an e-mail to sales.ppd@ametek.com or phone 800-733-5427.

New AC/DC Power Source Makes Three-Phase Power More Affordable

Written on May 15, 2017 at 9:56 am, by

SAN DIEGO, April 4, 2017AMETEK Programmable Power has added a 22.5 kVA unit to its popular California Instruments MX Series II AC/DC Power Sources. The MX22.5 delivers up to 22.5 kVA and can be configured to have single-phase or three-phase outputs in AC, DC or AC+DC mode. The MX22.5 is more economical than the California Instruments MX30, while at the same time offers more features and higher output power than the product family’s MX15 model.

The California Instruments MX Series II provides controlled AC and DC output for a wide variety of automated test equipment and product test applications at an affordable cost. Using state-of-the-art PWM switching techniques, the MX series combines robustness and functionality in a compact floor-standing chassis, no larger than a typical office copying machine. And, this higher power density does not need elaborate cooling schemes or additional installation wiring. Simply place the unit in its designated location (using included casters), plug it in, and the MX Series is ready to operate.

The MX22.5’s innovative features include:

  • Simple operation.  The MX Series can be operated completely from its menu-driven, front-panel controller. A backlit LCD display shows menus, setup data, and read-back measurements.
  • Expandable power levels. Users can combine units to configure systems up to 135 kVA or more.
  • Switching between single-phase and three-phase outputs. Phase mode programming on MX22.5-3Pi allows users to easily switch between single-phase and three-phase output modes.
  • Arbitrary and harmonic waveform generation. Using the latest DSP technology, the MX Series programmable controller is capable of generating harmonic waveforms and arbitrary waveforms to test for susceptibility to harmonics and other power anomalies.
  • Regenerative, bidirectional “green” power. Automatic crossover between source and sink power modes offers regenerative capabilities in AC or DC mode. The power sources can regenerate up to 85% of the rated output power back to the utility grid during sink mode operation when equipped with the -SNK or -SNK-DC option.
  • Power measurements. The MX Series can make a wide variety of measurements in addition to supplying power, including frequency, Vrms, Irms, Ipk, crest factor, real power (watts), apparent power (VA), and power factor. These measurements  are accessible from either the front panel or the remote control interface.
  • Remote control. The MX Series can be equipped with RS-232C, USB, IEEE-488, and LAN Interfaces for remote operation and automated test applications.

For More Information
To learn more about AMETEK‘s programmable power supplies and programmable electronic loads, contact AMETEK Programmable Power Sales toll free at 800-733-5427, or 858-458-0223, or by email at sales.ppd@ametek.com.  Information also is available from an authorized AMETEK Programmable Power sales representative, who can be located by visiting http://www.programmablepower.com/contact.

About AMETEK Programmable Power
AMETEK Programmable Power designs, manufactures and markets precision, AC and DC programmable power supplies, electronic loads, application specific power subsystems, and compliance test solutions for customers requiring and valuing differentiated power products and services. It offers one of the industry’s broadest portfolios of programmable power products under the California Instruments, Sorensen, and Elgar brands.

AMETEK Programmable Power is a business unit of the AMETEK Electronic Instruments Group, a leader in advanced instruments for the process, aerospace, power, and industrial markets and a division of AMETEK, Inc., a leading global manufacturer of electronic instruments and electromechanical devices with 2016 annual sales of approximately $4.0 billion.

For further information contact:
Craig Frahm
Tel: (858) 678-4459
E-mail: craig.frahm@ametek.com
Website: www.programmablepower.com