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Reviews (16)
Feb 06, 2017
What you need to know
8 of 8 found this helpful This power meter is useful within its limitations. It measures and displays RF power in dBm and peak to peak voltage into 50 ohms.
It also displays Frequency in MHz and Offset in dB. Frequency and Offset are user entries rather than measurements.
With the Frequency entry, YOU tell it the frequency of the power source it is measuring. It then adjusts the power and voltage readings to correct for its built in error sources, probably from a look-up table of corrections. These corrections can be rather large. The point is that the frequency response is not flat, so the corrections are required. With this caveat, accuracy isn't bad. I like my power meters to have a flat response with frequency, so I don't recommend this unit.
With the Offset entry, YOU can enter corrections if you determine errors with your own calibration source. A more practical application of the Offset feature is to adjust for the attenuator(s) that YOU add to the input in order to extend the input range to higher power. If you add a 30 dB attenuator, adjust the reading to read 30 dB higher.
Finally, if you connect the USB cable to a laptop to provide power, it also sends measurements of power in dBm and voltage in mVpp as a serial data stream at 9600 baud to a serial port on the laptop. For this to work, YOU MUST locate and install suitable drivers for the CH340G USB chip common in inexpensive versions of Arduinos from China. Locate and download ch341serDOTexe.
Jul 08, 2019
Local provider won't cut the keys.
Local provider won't cut the keys.
Aug 30, 2021
You get what you pay for
More lines than usual, so must read and write in tiny print.
The alternate greyed lines are darker than what I prefer.