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- #Rigol dsa815 tg bpbr tuning how to
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By moving the marker to 130 MHz, we can read the return loss of 18.07 dB. Note, also, the primary (double) resonance about 108 and 130 MHz, as well as the odd-order resonances about 338, 561, 780, and 1,000 MHz. Just ignore the “minus” sign for purposes of this measurement. Note that classical “return loss” is a positive number, but is represented on the analyzer as a negative number. By using the Marker, you can measure both the resonant frequency and return loss.
#Rigol dsa815 tg bpbr tuning full
I extended the telescoping antenna to its full height of 27 inches. In the example of Figure 1, I used a small square of aluminum foil to serve as a counterpoise for the monopole antenna being measured. Next, connect the device whose port is to be measured (antenna, etc.) to the IN port of the coupler and read off the return loss in dB directly on the screen. If you’d like to move this line down, use the Norm Ref Lvl and tuning knob to set this as desired. This will display a normalized (straight) line across the top of the screen at zero dB reference. Press TG on the main panel, then TG On in the soft keys, Normalize, Stor Ref, and Normalize On. Adjust resolution bandwidth to about 30 kHz, or so, for a better dynamic range. The Device to be measured will connect to the IN port of the coupler, but wait until after the normalization procedure to connect it.
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Connect short coax cables between the CPL port to the DSA815 RF Input and the OUT port to the tracking generator Gen Output port. You’ll need a Mini-Circuits ZF-DC-5 20 dB coupler, or equivalent.
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All that’s required is to measure the return loss (in dB) and use that to calculate VSWR using Equation 1.įigure 1 – Measurement setup for return loss. This method is an alternative when the VSWR option is not included. If you don’t have this option, you can alternatively measure return loss (RL) using just the tracking generator feature. If you’ve also ordered the VSWR option, the measurement will read out VSWR directly. In order to use the Rigol DSA815 to make these measurements, it must have the tracking generator option. This would usually be expressed as a VSWR of “1.3”. For example, an antenna may measure 1.3:1 at resonance.
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This article discusses how to use the Rigol DSA815 to make this measurement. For example, if an antenna measured a VSWR of 2:1 at a particular frequency, this could indicate an antenna impedance of either 100 or 25 Ohms (the impedance deviated from 50 Ohms by either twice or half). It is generally expressed a a ratio of the measured impedance to 50 Ohms. High precision amplitude readings: this technology almost eliminates the errors generated by filter switching, reference level uncertainty, scale distortion, as well as errors produced in the process of switching between logarithmic and linear display of amplitude when using a traditional analog IF design.Voltage Standing Wave Ratio (VSWR) is a measurement of the impedance match of any RF component, subassembly, instrument in reference to a standard 50-Ohm resistive impedance. The ability to distinguish between small signals by frequency: using the IF filter with the smallest bandwidth setting it is possible to make out signals with a frequency difference of only 100 Hz. Benefits of Rigol's all digital IF design The ability to measure smaller signals: on the basis of this technology, the IF filter enables smaller bandwidth settings, which greatly reduce the displayed average noise level.
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The menu navigation is very intuitional in use and all functions and parameters are easy to reach because of the graphical interface. The Rigol Spectrum Analyzers have a sophisticated and easy to use user interface and offers multiple functions for all tasks.
#Rigol dsa815 tg bpbr tuning manual
These functions enable the analyzer to acquire signals and match parameters automatically, instead of the manual process necessary with a traditional analyzer. The very large display ( 20.3 cm / 8) of the Rigol DSA815 Spectrum Analyzer with a resolution of 800x480pixels provides a very good overview over all its comfortable functions like Auto Tune, Auto Range, Auto Scale and Auto Couple. The use of digital IF (intermediate frequency) technology guarantees reliability and performance to meet the most demanding RF applications.
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The Rigol DSA815/TG is a compact and light Spectrum Analyzer with premium performance for portable applications.