| Customization: | Available |
|---|---|
| Output Type: | Single |
| Warranty: | 1 Year |
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The Keysight 66312A Dynamic Measurement dc Source provides dynamic measurement and analysis of voltage and current waveforms. It is ideal for testing digital wireless communications products/components because it not only provides the power for testing, but also performs the peak current measurements required to characterize the pulsed current demands of these products.
Introduction
Want to learn how to reduce noise from your power supply? How about simplifying your test setup? Read on!
A power supply is an integral part of any good test system. The capability to deliver clean and accurate power to your Device Under Test (DUT) removes doubts and gives you the right results every time. Our practical tips will let you get more out of your power supply. If you ever need to get a new power supply, you can count on these tips to help you choose the right one. Remember, more power and features do not mean better a better power supply. It's about how you use your power supply.
Don't worry about your power supply. Let us do that for you. We want you to focus on what's important to you. We hope you enjoy our tips.
Table of Contents:
Tip 1: Use Remote Sensing to Compensate for Load-Lead Effects
When your power supply leaves the factory, its regulation sense terminals are usually connected to the output terminals. This limits the supply's voltage regulation abilities, even with very short leads. The longer the leads and the higher the wire gauge, the worse the regulation gets (Figure 1). Compare the output impedance of a well-regulated 10 A supply, which might have an output impedance of 0.2 mΩ, with the resistance of copper wire.
And regulation gets even worse if you use a relay to connect power to the load.
Remote sensing, in which you connect the sense terminals of the power supply's internal feedback amplifier directly to the load, lets the power supply regulate its output at the load terminals, rather than at its own output terminals (Figure 2). The supply voltage shifts as necessary to compensate for the resistance of the load leads, relays, or connectors, thereby keeping the voltage at the load constant.
To implement remote sensing, disconnect the local sense leads from the output terminals. Use a twisted two-wire shielded cable to connect the power supply sensing terminals to the sensitive points on the load. (Don't use the shield as one of the sensing conductors.) Connect one end of the shield to the ground and leave the other end unconnected.
Sensing currents are typically less than 10 mA, and as a general rule, you should keep the voltage drop in the sense that leads to less than 20 times the power supply temperature coefficient (usually stated in mV/°C). This is easy to achieve with readily available shielded two-wire cable.
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