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The Instek GPD-2303S dual-output programmable linear DC power supply unit provides a constant source of DC voltage and current for powering and testing electronic devices. The power supply unit (PSU) has two outputs that each provide DC voltage up to 30V and current up to 3 amp. Digitally controlled knobs on the unit's front panel allow for fine and coarse adjustment of the voltage and current output. The PSU has a resolution of 1mV (millivolt) or 1mA (milliamp), which allows the user to observe the device under test's response to small changes in voltage and current. Four LED screens show voltage and current readings for all outputs simultaneously. The outputs can operate independently, or they can be connected in series to supply more voltage or in parallel to supply more current. A lock function disables the unit's front-panel keys to help prevent accidental input. The PSU's internal memory can store up to four sets of front-panel settings for future recall. The PSU has a USB port for connecting to a computer for remote control (USB cable sold separately). Software is included for testing applications and for emulating the PSU's front-panel controls. The unit's LED screens are readable in low light. A power cord with a three-prong plug is included for connecting the PSU to a grounded outlet, and test leads are included for testing applications. A built-in cooling fan helps prevent overheating, and overload protection and reverse polarity protection help prevent damage to the PSU and the device under test. For regulation and ripple and noise characteristics, see the unit's
Specifications
Number of outputs2Maximum voltage and current outputVoltage: 30VDC; Current: 3 ampMeter resolution1mV (millivolt), 1mA (milliamp)Programming and readback accuracy+ or - 0.03% of voltage reading + 10 digits; + or - 0.3% of current reading + 10 digitsRecovery timeLess than or equal to 100 μs (microseconds) following a 50% load change with a minimum load of 0.5 ampTemperature coefficientLess than or equal to 300 ppm per degree CPower requirements100V, 120V, 220V, or 230VAC + or – 10% at 50 to 60 HzStandards metEuropean Conformity (CE) markingWeight7kgDimensions130 x 210 x 265mm (H x W x D)H is the vertical distance from lowest to highest point, W is the horizontal distance from left to right, and D is the horizontal distance from front to back.
Power supply units (also known as PSUs, AC power supplies, DC power supplies, and battery eliminators) provide AC or DC voltage to power or test devices such as tools, appliances, and electronic components. The PSU draws energy from a line source such as a wall socket and converts it to a constant, specified amount of voltage or current that is then outputted to a connected device. In general, a power supply unit will be classified as either a linear PSU (also known as a linear regulation or line-frequency PSU) or a switched PSU (also known as a switching-mode power supply, SMPS, or switcher). Typically, a linear PSU has a simpler design and provides a faster transient response time and less electrical interference and noise than a switched PSU. A switched PSU is often smaller, lighter, and more efficient than a linear PSU and generates less heat. The transient response time of a PSU indicates how quickly the PSU can resume the desired constant output after a sudden change in input. Ripple voltage or current indicates how much unfiltered noise and AC voltage or current is present at the output of a filtered power supply operated at full load. The temperature coefficient is the percent average change in output voltage per degree centigrade of change in ambient temperature. Fuses, current limiters, and other forms of overload protection can be built into the PSU to help protect against voltage spikes or short-circuiting.
GW Instek manufactures test and measurement equipment such as oscilloscopes, spectrum analyzers, signal testers, and video surveillance systems. The company, founded in 1975 and headquartered in Taipei, Taiwan, meets International Organization for Standardization (ISO) standards 9002 and 14001.
What's in the Box?
- Instek GPD-2303S power supply unit
- (2) GTL-104A test leads
- (2) GTL-204A European test leads
- (1) GTL-201A European test lead
- Power cord
- Instructions
Expedition
Reviewed in the United States on May 5, 2017
Low ripple, accurate...Knobs don't work well, it takes forever to set voltage.Fan is loud and not speed controlled.Channels/Regulation are very easily damaged. Channel 1 lost current regulation, then later stopped working.For something this expensive, it shouldn't have those issues.
Some Random Name
Reviewed in the United States on February 18, 2017
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Jan Bottorff
Reviewed in the United States on February 12, 2017
I got the 4 channel version. The controls are settable in 0.001 increments, and has 4 adjustable channels, so I can run things like analog/digital circuits than need dual rail +/- 15V, +1.8V,+3.3V, all from this one power supply. It does have USB computer control and not LXI Ethernet, it would have been nice but is not an included feature. The fan seems quiet at low power, but even at 10W output it was speeding up to be noticeable, staying cool is important though and assume keeping accuracy high may require avoiding too much change in temperature..Some of the other recent power supplies show things like watts, and graphs, this just has 4 groups of LED seven segment displays for volts and amps on channels 1 or 2 and 3 or 4. There is one volts knob and one amps knob with press to shift between course and fine, they have little steps you can feel and assume are optical encoders. A single button enables/disables all outputs, separate controls would have been nice. I had read about some supplies giving nasty spikes when you turn them on, so I hooked an oscilloscope to the different channels and power cycled it. I saw a few brief pulses of under 1 volt, so don't think most connected circuits will be damaged at power on. When I started shopping for a serious power supply, I was little surprised that a decent multi-channel power supply costs close to half a kilobuck, considering that a 4 channel oscilloscope is a bit less. After looking at all the available options, I choose this one, as it's still pretty affordable, and believe it will meet most of my needs for years to come.2 Year Update: This has been an awesome power supply. It seemed a little extravagant for my home lab, but after living with it for 2 years, it was money well spent. I use it for almost every circuit I experiment with. Need to drive a prototype circuit with a split +15V/-15V analog device, while powering a 3.3V microcontroller, while feeding 5V to another digital circuit, no problem. One of few changes I would make: put the handle on the side so the top is a smooth surface to stack other equipment.5 Year Update: Still works flawlessly. I recently was doing some careful current/voltage measurement on a project, and was curious how accurate the voltage/current readout on my power supply was. I was pleased to see that for about 3.3V and 1A, the Channel 1 power supply reading matched the bench DMM (calibrated a couple years ago) to within about -0.002. I believe this is way better than the spec. For a 5 year old half a kilobuck piece of equipment I was pleased. I recently needed to measure resistance in the few milliohm range, and just setting the PS to 1.000A or 0.100A and measuring the voltage drop with a DMM was an ok substitute for a real micro-ohmmeter.
ECE.Misho
Reviewed in the United States on November 28, 2014
SOLID!! it has more features than normal GPS-3303
Ian George
Reviewed in the United States on May 25, 2013
It works as advertised ... but It is larger , and noisier than I had anticipated ... not crazy , but not as quiet as other supplies I have ... The PC interface is not as user friendly as I had hoped for , but is functional.
michael
Reviewed in the United States on February 7, 2013
I have used this power supply for 2 years. It has done everything I have thrown at it. Highly recommend.
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