California Instruments - 3091LD Series 3000VA Programmable AC Loads
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Multi-mode AC Electronic Load
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Flexible solution for a wide range of AC power test applications
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3000 Watt Power Dissipation
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Master / Auxiliary configurations for higher power and multi phase applications
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50 to 350 V, 45 Hz to 440 Hz
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Commercial, Military and Avionics applications
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Programmable Crest & Power Factor
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Test AC power products for real-world conditions
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Built-in Measurements
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Eliminates the need for additional test equipment in bench or ATE applications
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Remote Control
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IEEE-488 and RS232C Interface for automated test applications
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The 3091LD is designed to provide precisely controlled, non-linear loads for testing AC power generation equipment such as UPS’s and AC sources. In addition, any active or passive current carrying devices such as switches, circuit breakers, fuses, connectors and power semiconductors can be tested. Traditionally, many of these products are tested using resistive load banks. This approach does not simulate real-world conditions such as switching DC/AC converters found in many AC powered products. This type of conventional testing does not fully exercise the equipment under test (EUT) under worst case operating conditions. High peak currents and low power factor loads can significantly impact the operating characteristics of a UPS or AC power product. The 3091LD AC Load can simulate high crest factor and variable power factor load conditions. This provides an effective method of testing AC products against real-world conditions and can significantly increase product reliability. Unless properly exercised, product defects may go undetected until a unit is used at a customer site, resulting in costly field returns.
Key Features
Key Features
- Multi-mode AC Electronic Load Flexible solution for a wide range of AC power test applications
- 3000 Watt Power Dissipation Leader / Follower configurations for higher power and multi phase applications
- 50 to 350 V, 45 Hz to 440 Hz Commercial, Military and Avionics applications
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Programmable Crest & Power Factor Test AC power products for
real-world conditions - Built-in Measurements Eliminates the need for additional test equipment in bench or ATE applications
- Remote Control IEEE-488 and RS232C Interface for automated test applications
Front Panel Control
The AC load can be operated from an easy to use, menu driven front panel. Product tests can be performed quickly in an R&D setting by punching up specific load conditions on the front panel and reading the measurement screen of the 3091LD. This fast interactive front panel control mode can be used during a product's early development cycle to isolate potential performance problems before the product leaves the engineering lab.
Automated Testing
The 3091LD can be deployed in ATE test stations using either IEEE-488 or RS232C remote control. The industry standard SCPI (Standard Commands for Programmable Instrumentation) protocol is used and instrument drivers are available to ease test software development. The built-in metering functions of the 3091LD AC load can be used to eliminate the need for additional test equipment such as meters, power analyzers and oscilloscopes. This and the reduced size of the 3091LD compared to passive load banks, represents a savings in both cost and rack space.
Power Levels
Each 3091LD is capable of dissipating 3000 W of single phase AC power. For higher power or three phase applications, a 3091LD leader unit can be combined with one or more follower units. The leader 3091LD unit provides the required consolidated measurements so the test system controller - or the operator - need only interface to the leader unit, regardless of the specific configuration. Single, split or three phase configurations can be software configured from the leader 3091LD.
Measurement and Analysis
The 3091LD can be used to emulate a wide variety of AC load conditions to support real-world testing and evaluation of UPS and AC source products. Specifically, the following modes can be selected:
| Common | ||
| Model | Description | |
| Constant Power | CP | This mode effectively emulates constant power loads such as switching power supplies. |
| Constant Resistance | CR | Emulates a conventional resistive load or power resistor. A programmable range from 2.5 Ohms to 1000 Ohms covers a wide range of applications. This mode can be used to replace conventional resistive load banks. |
| Constant Current | CC | Provides a constant current load. This mode may be used to simulate both linear (resistive) and nonlinear (active) loads for voltage regulation testing. |
| Constant Voltage | CV | This mode emulates a shunt regulator load and may be used to test current source products. |
| Short circuit | SC | Test the short circuit protection mode of the EUT by providing a short condition. The 3001LD can handle surge currents of up to 300 Amps for up to 50 msec and sustained currents of 30 Amps in this mode of operation. The low voltage cut-off of the load can be programmed from 50 Volts up |
User Control
All AC load modes are easily set from the front panel using a menu-driven user interface. The large LCD screen is used to display setup information as well as measurement data. Measurements include volt RMS, volt peak, current RMS, current peak, crest factor, true power, apparent power, power factor and frequency. Both voltage and current waveforms at the load input terminals can be digitized and displayed on the front panel graphical LCD. This allows EUT output behavior to be analyzed quickly without the need to hook up additional test equipment. A Windows graphical user interface (GUI) is provided to expand the measurement and display capabilities of the 3091LD. The GUI can be used to save and print test results for report purposes.
Crest Factor and Power Factor control
When operating in constant current or constant power mode, the 3091LD supports crest factor control by narrowing the conduction angle of the current waveform in order to match the requested crest factor. Thus, the peak current is increased while retaining the RMS current level. While the apparent power remains constant, the true power decreases. This results in a reduced true power factor. Consequently, as crest factor is increased, the true power factor automatically decreases. The load further controls power factor by shifting the current with respect to the input voltage (displacement power factor). Both leading and lagging power factor control is available. A phase shift of the current is only possible if the crest factor is higher than 1.414. Thus, crest factor and power factor control ranges are coupled as shown in the graph to the right.
Instrument Control Software
The large LCD screen is used to display setup information as well as measurement data. Measurements include volt RMS, volt peak, current RMS, current peak, crest factor, true power, apparent power, power factor and frequency. Both voltage and current waveforms at the load input terminals can be digitized and displayed on the front panel graphical LCD. This allows EUT output behavior to be analyzed quickly without the need to hook up additional test equipment. A Windows graphical user interface (GUI) is provided to expand the measurement and display capabilities of the 3091LD. The ICS can be used to save and print test results for report purposes.
California Instruments 3091LD Series : Specifications
| Ratings | |
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| Power | 3000 W @ 0-37° C; 2400 W @ 38-50° C |
| Current | 30 ARMS |
| Voltage | 50 to 350 VRMS |
| Frequency | 45 to 440 Hz |
| Max. Peak Power | 13 kW (up to 20% duty cycle) |
| Max. Peak/Surge Current | 90 APEAK Surge: 300 APEAK for 50 ms |
| Max. Peak Voltage | 500 VPEAK |
| Operating Modes | |
|---|---|
| Constant Current | Range: 0 to 30 ARMS; Accuracy: 0.2 % of full scale; Resolution: 0.05 % of full scale; Min. Set Current: Voltage / Maximum Set Resistance |
| Constant Voltage | Range: 50 to 350 VRMS; Accuracy: 0.2 % of full scale; Resolution: 0.05 % of full scale |
| Constant Resistance | Range: 2.5 to 100 Ohms, 100 to 1000 Ohms; Accuracy: 1% FS, 5% FS; Resolution: 0.05 % FS; Max. Set Resistance: 1 / (Freq.*1.3e-5) |
| Constant Power | Range: 3000 W @ 0-37° C,2400 W @ 38-50° C; Accuracy: 0.5% of full scale; Resolution: 0.1% of full scale |
| Crest Factor | Range: 1.4142 to 4.0, limited to 90 Apeak; Accuracy: 1 % of full scale; Resolution: 0.1 % of full scale |
| Power Factor | Range: 0 to 1 lead or lag limited by Crest factor settings; Accuracy: 1 % of full scale; Resolution: 0.1 % of full scale |
| Short Circuit Mode | Max. Surge current: 300 APEAK, up to 50 msec; Max. Cont. current: 30 ARMS; Max. Voltage drop: 2.5 VRMS |
| Measurements | |
|---|---|
| Frequency | Range: 45 to 440 Hz; Accuracy: 0.1% FS; Resolution: 0.05% FS |
| Voltage | Range: 50 to 350 VRMS; Accuracy: 0.1% FS; Resolution: 0.05% FS |
| Peak Voltage | Range: 50 to 500 V; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Current | Range: 0 to 30 ARMS; Accuracy: 0.2% FS; Resolution: 0.1% FS |
| Peak Current | Range: 0 to 90A; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Crest Factor | Range: 1,4142 to 4.0; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Apparent Power | Range: 0 to 3000 VA; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| True Power | Range:0 to 3000 W; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Peak Power | Range: 0 to 45,000 W; Accuracy: 1% FS; Resolution: 0.1% FS |
| Reactive Power | Range: 0 to 3000 VA; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Power Factor | Range: 0 to 1; Accuracy: 0.5% FS; Resolution: 0.1% FS |
| Resistance: Range |
2.5 to 100 Ohms,100 to 1000 Ohms; Accuracy: 1% FS, 5% FS; Resolution: 0.05% FS Protection Over |
| Protection | |
|---|---|
| Over Current | Limited by input - Circuit Breaker and Set Maximum Current Limit in software. |
| Over Voltage | Output protected for voltage transients over 500 V in hardware. |
| Over Power | Power limited at maximum average and peak rated power in hardware. Limited to Set Maximum Power Limit in software. |
| Over Temperature | Monitors heat sink temperature. |
| Mechanical Specifications | |
|---|---|
| Dimensions | H: 8.75” (222 mm), W: 16.88” (429 mm), D: 25“ (635 mm) |
| Weight | 74 lbs / 34 Kg. |
| Remote Sensing | Max. 2V drop between sense and load lines |
| Isolation | 1000 V between input and chassis ground |
| Audible Noise (@1meter) | Audible Noise (@ 1meter): Low power: 49.0 dBA; Full power: 69.5 dBA |
| Control Power Input | 115 Vac or 230 Vac (model -230) ± 10%, 47 to 63Hz |
| Operating Temperature | 3000 W @ 0-37° C, 2400 W @ 39-50° C |
| Interfaces | |
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| GPIB | Standard |
| Remote Control | |
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| IEEE-488.2 |
GPIB talker, listener Subset: AH1, C0, DC1, DT1, L3, PP0, RL2, SH1, SR1, T6 |
| Language/td> |
SCPI RS232C |
| Baud rates | 9600, 19200, 38400 |
| Handshake | RTS/CTS |
| Format | 8,n,1 |
| Language | SCPI |
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Solid station frame
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Built-in vibration-isolation solution for superior vibration attenuation
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Rigid microscope bridge
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Compact and rigid mechanical design
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Highly accurate measurement results
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Incorporates best-known methods
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Ergonomic and straightforward design for comfortable and easy operation
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Low-profile design
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Simple microscope operation
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Quick and ergonomic change of DUT through pull-out stage
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Minimize training efforts
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Fast time to data
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Convenient operation
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Simplifies test setup with inline operation and automated discovery
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Tests across a wide range of protocols
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Modifies real-world network traffic and CRCs
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Triggers protocol analyzers or other test instruments at the error injection point
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Automates regression testing through stored test cases
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Single and three phase modes
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Arbitrary & Harmonic Waveform Generation
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Standard LXI LAN, USB, and RS-232, Optional GPIB
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500uS time resolution for Transients
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AMETEK Programmable Power
Located in San Diego, California, 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. Also part of our business is VTI Instruments, which delivers precision modular instrumentation and systems for electronic signal distribution, acquisition, and monitoring, used in the world's most demanding test applications.
AMETEK Programmable Power boasts one of the industries' broadest portfolios of programmable power products under the well-known and respected Sorensen, Elgar, and California Instruments brands. AMETEK Programmable Power’s products serve a wide range of stimulus (T&M) and process power needs in applications including semiconductor fabrication, commercial and defense ATE, oil exploration, solar array and battery string simulation, avionics, general R&D and EMC compliance testing.
VTI Instruments provides products and systems which are used to monitor and record data that characterizes the physical integrity and performance of aircraft, engines, and other large structures, as well as automate the functional testing of complex electronic systems. VTI Instruments is recognized as an industry leader with a reputation of providing reliable data, first time, every time.
With strong brands, a broad product portfolio, exceptional precision power conversion and control expertise, proven power system integration capabilities and deep applications knowledge, AMETEK Programmable Power is your source for programmable power supplies, precision data acquisition instruments, and more.
Contact Details
AMETEK Programmable Power, Inc. − San Diego
9250 Brown Deer Road, San Diego, CA 92121, USA
Phone: 858-450-0085
Fax: 858-458-0267
Email: sales.ppd@ametek.com for general inquiries
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