2 minute read
ANNOUNCING: 2023 NOMINATIONS F
Generator level→ -50 dBm -20 dBm
0 dBm MHz Generator level→ 2 mV p-p 63.2 mV p-p .632 V p-p 1 -48.10 -18.10 1.80
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50 -49.00 -19.30 0.70
100 -49.40 -19.60 0.40
150 200 -49.20 -49.80 -19.90 -20.10 0.10 0.00
250 -49.20 -19.70 0.20
300 -49.70 -20.00 0.10
350 -49.10 -20.10 0.20
400 450 500 -50.10 -50.20 -51.30 -20.10 -20.50 -21.10 -0.20 -0.10 -0.40
Table 2. Power readings in dBm at various input levels and different frequencies.
Figure 1. Measurement and error data from Tables 2 and 3 presented in graphical format. This particular meter is most accurate at VHF and low UHF frequencies.
10 dBm 2V p-p 11.90 10.60 10.60 10.70 10.40 10.60 10.20 10.80 9.70 9.60 9.50
MHz -50 dBm -20 dBm 0 dBm 10 dBm 1.00 -1.90 -1.90 1.80 1.90 50.00 -1.00 -0.70 0.70 0.60 100.00 -0.60 -0.40 0.40 0.60 150.00 -0.80 -0.10 0.10 0.70 200.00 -0.20 0.10 0.00 0.40 250.00 -0.80 -0.30 0.20 0.60 300.00 -0.30 0.00 0.10 0.20 350.00 -0.90 0.10 0.20 0.80 400.00 0.10 0.10 -0.20 -0.30 450.00 0.20 0.50 -0.10 -0.40 500.00 1.30 1.10 -0.40 -0.50
Table 3. Error levels (in dBm) measured at various frequencies. Themeterismostaccurateat200and300MHz, and least accurate at 1 MHz and 500 MHz.
monitors with a lightning bolt between them. Connect the power meter to any USB port and turn on the power using the small slide switch on the side of the meter. The power meter will light up. Push the middle button so it begins measuring a level. Now you must determine the USB (COM) port number. Go to Device Manager by right clicking the lower left corner Windows symbol. Open up “Ports (COM & LPT). ” My meter showed up on my PC as “USB -SERIAL CH340 (COM5). ” Note the COM port number. Start PuTTY and select the “Serial” button for connection type. Then enter the port number (COM5 for me) into the “Serial line” window. Click “Open” and a window should open with the data scrolling across the screen.
I didn’t bother trying to format the data on the screen. Perhaps someone more knowledgeable can provide information on how to do this. It’s neat to see this communication between a PC and the power meter but it has no practical application for me. You can “straighten” the columns of data by opening the window a bit at a time.
