Rigol dsa815 reference measurement how to#
Rigol dsa815 reference measurement series#

Those that have already have made this modification are pleased with their results. After reading the following attached information: If you are not comfortable making these modifications, understanding that you may want, or have to revert back to the original circuitry, or do not have the required skills, then by all means do not continue further. Purpose: To reduce the Noise Floor (DANL) and improve the sensitivity to be similar to that of the Newer DSA815 with Main Boards 00.07 - 0.09 (Boot v. Note that the the following change does not affected the unit's calibration. It is NOT APPLICABLE to Main Boards 00.07 - 0.09 (Boot v. Edit: Open the NF Calc Excel in the 'Read Only' mode If, Or when prompted.ДSA815/DSA815-TG Spectrum Analyzer Modification for Lower Noise Floor This Modification applies ONLY to the DSA815 with Main Board 00.04 - 00.05 (Boot V. If you want to save your own defaults, then simply save your file, and replace the original with it (without the prefix 'Copy of'). The defaults can be helpful during initial use (on the learning curve) to appreciate the general values to expect. This way, if you copy a result that had invalid entries resulting in math errors, etc, this could be confusing the next time you open the the NF Calc file. I set the files as Read Only to prevent users from accidentally coping over the original file, and thus loosing the original default values.

You can save copies of your NF measurement calculations and they will be saved with the prefix 'Copy of. Please open the NF Calc Excel in the 'Read Only' mode if/or when prompted. Most modern SAs have this capability, including of course the DSA800 Series. Note that Spectrum Analyzer (SA) Noise measurements for accurately determining Noise Figure (NF) require the use of a RMS Detector and ~ 100 sweep averages. I also provided information on an economical Calibrated RF Noise Source. Although this information is not required for Noise Figure calculations, and may not be of interest to most users. The version labeled 'Full' provides additional information that is not in the 'Std' version. 'Noise Figure Calculator' The NF Calculators provided are Excel Workbook files, and as such require MS Excel (or compatible) on your PC. intended to have the thing hacked 'properly' a long time ago. Anyway I eventually wanted to include the 'PIC hack'. I've probably got to rip the box apart again to get the numbers on the package.

It's got to drive the input(s) of the ADC through a set of filters and an un-bal transformer so I'ld expect the maximum signal levels at U120's output to be closer to 10dBm than to -10dBm.

Rigol dsa815 reference measurement series#

Also, the BFP780 or one of this series would make sense since it's the last IF stage and the signal levels could be considerable. Hence, my bet is that it's an NPN transistor. And then, there's three 10 Ohms resistors in parallel to ground connected to the terminals where one would expect the emitter of an NPN RF transistor in the aforementioned package. Moreover, the pinout is rather uncommon for a typical SOT-343 gain block. Ted - to me the U120 device rather looks like an RF transistor (similar to a BFP780) since there's a bias voltage divider at the input (150/75 Ohms), usually not to be found around MMICs. 4.) Frequency Deviation Measurement with an RTL-SDR Dongle (as a Spectrum Analyzer): Perhaps this may be of interest if you don't have a Spectrum Analyzer. This is also a nice introduction to AM, FM, and Bessel Null Frequency Deviation Measurement. 3.) TRX Bench - #166 FM modulation and deviation on the spectrum analyzer explained.

This video uses a CW receiver, although it is easier to use a Spectrum Analyzer instead.

Rigol dsa815 reference measurement how to#

2.) W2AEW - #101: How to measure FM Frequency Deviation without special equipment using Carrier-Bessel Null. For a accurate measurement of FM Frequency Deviation you would want to use a Bessel Null Measurement as follows below in items 2.) and 3.). 1.) W2AEW - #159: How to measure FM frequency deviation with a spectrum analyzer. Of course a Frequency Counter would not be applicable for FM Deviation measurement covered here. And to do that, you need to use a qualified RF Frequency Counter. And as I tried to make clear in the procedure I provided for 'DSA800 Frequency Standard Calibration' (Reply #954 above), is that the DSA800 Marker does not provide an accurate method for determining a precise RF frequency. W2AEW states that his procedure below in item 1.) is for determining a Quick Estimation of FM Deviation. FM Frequency Deviation Measurement: General information for those interested.