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1. Download the attached .tsp file
2. Make sure your DMM’s command set is set to TSP in MENU > Settings
3. Put the script on a USB drive and insert into the DMM
4. Press MENU then touch "Run" in the "Scripts" column
5. Select the script named "MeasurePower.tsp"
6. Click "Run Selected"
The script leverages the fact that the Ratio function stores a voltage measurement for both Sense and Input voltages in a single reading, displaying Input voltage over Sense voltage. If we use a shunt resistor across the Sense terminals, we can measure current because we know the shunt resistor value and we measure the voltage across the resistor. The Sense voltage value is stored in the extra field of the buffer, so we make the reading buffer a "Full" style buffer to include this value. The shunt resistor value is divided out of the Sense voltage measurement according to Ohm's law, giving us a value for current. The Sense voltage is also multiplied out of the Ratio measurement to get Input voltage. The two are then multiplied together to find power and the result is stored in a writable buffer, which is shown on the instrument's screen. The timing and number of measurements can be adjusted by changing the "timeBetween" and "readings" variables in the script.
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Starting from the indicated procedure for measuring power using the DC Voltage Ratio function, I would like to know how will be possible to use 2x DMM6500 units, both configured in the same way (meaning using the DC Voltage Ratio function), and to collect data from the input and the output of a DC-DC Converter.
The application is to measure the DUT's efficiency (output power vs. input power).
Is it possible also to provide a script that could be used to perform such a measurement?
Thank you very much!
- Keithley Applications
- Posts: 1517
- Joined: October 15th, 2010, 10:35 am
- Country: United States
For DC-DC converter efficiency, you’d still need a power source for the input and some loads on the output.
How many load conditions would you want?
Could be more straightforward to use power supply with 6.5 digit measurements for input (model 2280S), and a SMU as the load inducing watt meter on the output (model 2450 probable). The 2450 could control the 2280S over LAN and our TSP.NET.
I discussed this idea with the Kickstart team a year ago. I suggested taking AC measurements as well. The result could be an amazing measuring complex. I was even going to buy a second 6500 ...
Much to my chagrin, nothing happened. My interlocutors really liked the idea too. But! Corporate interests have trampled on common sense.
I am more than confident that the possibility of such a measurement would increase sales of 6500 and would not affect the sales of expensive instruments.
And even that is not all. My attempts to initiate the improvement of two existing power measurement scripts ... Yes, they did not find any interest.
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