Instructions

Model DMM6500
6½ Digit Multimeter User's Manual Section 9: Measuring power using digitizing and TSP-
Link
DMM6500-900-01 Rev. B / August 2019 9-7
-- Calculate power using reading index-based method.
power_total = 0
num_readings = current_buffer.n
-- Iterate through each current and voltage reading, and calculate power.
for i = 1, num_readings do
current = current_buffer.readings[i]
voltage = voltage_buffer.readings[i]
-- Keep track of the total power
power_total = power_total + current*voltage
end
-- Find average power by dividing total power by the number of readings.
average_power = power_total / num_readings
print(average_power .. " Watts")
-- Print results to USER swipe screen.
node[1].display.changescreen(display.SCREEN_USER_SWIPE)
node[1].display.settext(display.TEXT2, "Average Power: ".. string.format("%8f",
average_power) .. " W")
node[2].display.settext(display.TEXT2, "Average Power: ".. string.format("%8f",
average_power) .. " W")
Results
The voltage and current waveforms captured on the DMM6500 show the power consumption
resulting from the use of the DUT. You can identify the transmission state of the device by the areas
of high current consumption and the visible drop in voltage from the battery. Because these
measurements are triggered within 2 µs of each other, the voltage and current data is synchronized
nearly point-for-point.
You can expand on this example by importing the data from the reading buffer from each of the
instruments to a computer and analyzing the data more closely.
Figure 45: Master node measuring voltage