Bench Power Supply | Benchtop Power Supply | Test and Measurement World
This page of equipments section of Test and Measurement World covers Benchtop Power Supply. This page will guide to choose right Bench Power Supply.It mentions popular vendors of Benchtop Power Supply.
Benchtop Power Supply Features
Following features are need to be considered for selecting right Bench Power Supply for your need.
• Resolution: Smallest change in voltage/current which can be set on the power supply.
• Accuracy: It is the measure of how close actual measurement is with respect to theoretical one.
Output uncertainty here depends on Digital to Analog Conversion errors.
• Readback accuracy: It is the measure od how close internal measurement is with respect to
theoretical output value.
• Readback resolution: Smallest change in internal measurement of voltage/current which can
be distinguished by power supply.
• Stability: Performance of power supply varies due to aging.
In order to maintain stability, regular calibration and verification are required to be done.
• Temperature stability: Accuracy of power supply is usually specified in terms of
temperature range. This is due to the fact that performance varies based on temperature.
• Load regulation: It is measure of capability of power supply's output voltage/current
to remain constant during variation in load changes.
It is expressed as +/- (% of setting + offset).
• Line regulation: It is measure of capability of power supply's output voltage/current
to be within limit during variation in AC line changes.
It is expressed as +/- (% of setting + offset).
• Ripple: It is spurious AC components present on DC voltage supply.
Less is the ripple better is the power supply.
More ripple based power supplies generate unwanted spurious frequencies.
• Transient Response: It is measurement of time required to settle for stable DC voltage upon
application of sudden changes in the load impedance and power supply settings.
• Acceptable max. noise level at output.
• Number of outputs needed.
• Interface types: IEEE-488(or GPIB), RS232, Ethernet, USB
Bench Power Supply Vendors
Following table mentions popular vendors of Benchtop Power Supply.
| Company | Model | Features |
|---|---|---|
| Keithley Instruments Inc. | 2230G-30-1 | • Available in 3 channels, DC programmable • Channel-1 & 2: 0 V to 30 V, 1.5A • Channel-3: 0 V to 6 V, 5A |
| MASTECH | HY3005F-3 | • Variable triple outputs: 0 to 30 V, 0 to 5Amp • Fixed Output of value 5 Volt, 3 Ampere |
| B&K Precision | 9132B | • Available in 3 channels programmable Benchtop power supply • Channel-1 & 2: 0 V to 60 V, 3 Amp. • Channel-3: 0 V to 5 V, 3 A |
| AIM-TTI Instruments | QL355TP | Bench power supply, 3 channels, 35 Volt, 5 Ampere, programmable |
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