Skip navigation
All Places > Keysight Blogs > General Electronics Measurement > Blog > 2017 > August
2017

Just tell us how a new Keysight power supply will help you “Power Up Your Bench”.
Go to the website: www.keysight.com/find/PowerUpYourBench and upload a story, picture or video today!
There will be 22 new power supplies awarded over the next 22 weeks! Each winner will receive a new E36312A with GPIB (valued at $1550 U.S. list price each) from August 28, 2017 through January 26, 2018. A panel of judges will select the best entries based on innovation and creativity, uniqueness of benefits and clarity of presentation. Multiple entries allowed!

Get more from your power source with the surprising capabilities of Keysight’s new E36300 series triple output power supplies
- more confidence with accurate programming/readback and low output ripple/noise
- more convenience with 5.4 inch color LCD, USB/LAN/GPIB and front and rear connections
- more capability with low range current measurement, data logging and auto-series/parallel connections

How can I get more power from my power supplies?

If you need more voltage than one of your power supply outputs can provide, you can put power supply outputs in series to increase the total voltage. If you need more current than one of your power supply outputs can provide, you can put power supply outputs in parallel to increase the total current. However, you do have to take some precautions with series or parallel configurations in a multiple output power supply.

 

Precautions for series connections for higher voltage:

  • Never exceed the floating voltage rating (output terminal isolation) of any of the outputs
  • Never subject any of the power supply outputs to a reverse voltage
  • Connect in series only outputs that have identical voltage and current ratings

Precautions for parallel connections for higher current:

  • In most applications, one output must operate in constant voltage (CV) mode and the other(s) in constant current (CC) mode
  • In most applications, the load on the output must draw enough current to keep the CC output(s) in CC mode
  • Connect in parallel only outputs that have identical voltage and current ratings


You can use remote sensing with either a series or parallel configuration. Figure 1 shows remote sensing for series outputs and Figure 2 shows remote sensing for parallel outputs.

On our E36300 series multiple output power supplies, configuring series and parallel output configurations is simple. With a single button setup, the E36312A and E36313A can be set to series or parallel mode to double the output voltage (up to 50V) or current (up to 4 A), respectively.  The setting is done through the front-panel display with graphical user interface instructions.

 

Once set up, you can control the combined channels as a single output and use them to measure as a single channel. You save time by eliminating the need for external wiring between channels for the connection. 

 

You can find more information about power supply series and parallel configurations in an Agilent power supply document called “Ten Fundamentals You Need to Know About Your DC Power Supply

 

Refer to tip number 4. This document also covers nine other useful power supply fundamentals.

 

 

To learn more, see bench power supply testing

Data acquisition (DAQ) instruments can normally meet many application needs by its scanning mode and universal input capabilities. With its scanning mode, you can configure each of its channels to measure various types of inputs such as AC/DC Volts, AC/DC Current, Resistances, signal frequency and temperatures. With its built in DMM, you can do a lot of measurements. However,

·        What if you want to use the DAQ for switching purpose?

·        What if you have measurements that consists of a matrix of different tests and multiple DUTs?

·        What if you want to perform data logging on measurements that cannot be done by the DAQ’s built in DMM i.e. high frequency power and other measurements?

·        What if you want to provide multiple sources or loads into your DUT(s) i.e. AC or DC source, arbitrary waveform, electronic loads, etc?

Suddenly, switch modules become really handy. Please refer to the module selection guide below.

Module selection guide

34901A, 34902A and 34908A can be used as scanning modules and also as switching modules. Differences are its relay switches with tradeoffs between switching speed and power handling.

34903A has dedicated SPDT switching relays that can drive actuators as well as general switching applications.

34904A is a dedicated 4 X 8 switch matrix.

34905A and 34906A are RF switch multiplexers with 50 and 75 termination respectively.

So, how do you AUTOMATE with your DAQ switching modules?

·        Simple automation without programming would be to use the BenchVue DAQ software. Figure below shows graphical switches you can easily toggle the switches

BenchVue graphical switches

·        Figure below shows a simple Testflow graphical tool toggling a switch 10 times

Testflow switching

In the command expert, this SCPI command to switch open channel 101 is as shown below:

Command expert

:ROUTe:OPEN (@101)

Similarly, to close switch channel 101, it is

:ROUTe:CLOSE (@101).

To speed up your automation, you can switch on/off a group of switches in a single command. Here are two examples:

-         Switch open channels 01 through 05 on the module in slot 100. ROUTe:OPEN (@101:105)

-         Close Switch channels 02 through 07 and 09 on the module in slot 200 and channels 02 through 08 on the module in slot 300

ROUTe:CLOSE(@202:207,209,302:308)

For more information on Keysight’s general purpose DAQ instruments, please visit:

www.keysight.com/find/34970A

www.keysight.com/find/34972A

For more information on Keysight’s BenchVue software, please visit:

www.keysight.com/find/benchvue