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dB is a pure counting unit: for power, dB = 10*lg(A/B). For voltage or current, dB = 20*lg(A/B). The meaning of dB can't be simpler, that is, a very large (followed by a long string of 0) or very small (a long string of zeros in front) is expressed in a short form. Such as:
X=1000000000000000 (15 zeros in total) It can be expressed as: 10lgX=150dB
X=0.000000000000001 It can be expressed as: 10lgX=-150 dB
dBm defines miliwatt (milliwatt). 0 dBm=1mw;
dBw defines watt. 0 dBW = 10lg1 W = 10lg1000 mw = 30 dBm.
By default, dB always defines the power unit, which is calculated as 10lg. Of course, in some cases, signal strength (Amplitude) can be used to describe work and power. In this case, use 20lg as the meter. This applies to both the control field and the signal processing field. For example, sometimes you can see the expression of dBmV.
gfra
2025-08-10 17:52:09
For an inexpensive power meter this is quite good. Get a 20 dB SMA attenuator so you can measure power up to 100 mW. But the unit is reliable and very easy to use.
WC
2025-08-05 11:07:54
I built a handy RF level tester by mounting this circuit board in the plastic case which it was shipped in. Comparing its readout with that of some signal generators, I believe that it is pretty accurate except when getting to the measurement extremes. In other words, when the applied signal lever approaches 0dBm or -50dBm, amplitude reading isn't as accurate. In the middle of the amplitude range it seems pretty good. With use of external attenuators, its upper range can easily be extended. This has become a handy checker of signal generators that I work on and other oscillator devices.
Harmit G
2025-07-28 16:35:15
Love this product, you can use it as a power meter to measure the attenuation for a RF switch . Highly recommended.
Customer
2025-07-16 12:11:24
I spot calibrated it with a signalhound tracking generator in CW and spectrum analyzer at -10, -20, and -30 dBm.consistently reads 3.5+/-1 dB hot over 1 GHz to 3 GHz, but with a bit of work you could probably create curves that got you within half a dB of truth.Haven't tried it with a modulated input yet.
Phil
2025-05-10 16:14:54
I found this to be accurate. The reason for the 4 stars is that it does require effort to package the unit.
steven canning
2025-04-06 12:24:30
This unit exceeds my expectations which is something I rarely am able to state . Great job guys !!
Larry Sandbo
2025-03-15 14:34:41
Very accurate and easy to use.
Xepherrea
2024-12-28 20:54:12
This is a fairly decent cheap little power meter for checking power levels. This isn't going to beat an HP/Agilent/Keysight power meter sensor, but its better than nothing if you don't already have one.A downside that it has is between -40 to -50 dBm the readings jump a lot. at -50 dBm, using a 3336C level generator the meter was jumping 2-3 dBm and was not reading -50. It appears to have its limitations, but at least down in the 1 MHz to 20 MHz range is was reading the same.
OMR
2024-12-26 12:55:47
This is a very inexpensive microwave measuring instrument! A game changer indeed.
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