On Sat, Sep 19, 2020 at 03:30 PM, Scott wrote:
hello there cant seem to beable to calobrate the high input it shows up red on the display.. the low input is calobrated fine that shows in white..have i done something wrong? if you could reply that be great thanks...
Scott,
? If you have an accurate external generator the procedure is straight forward.
? 1.? Connect the generator to the high port using a frequency from 240-960M and at a level that does not over drive the port (i.e. -30dBm).
? 2.? Center the signal and use a span of about 10MHz for good level accuracy.
? 3.? Go to CONFIG->EXPERT CONFIG->ACTUAL POWER and enter the generator output level (i.e. -30dBm).
? 4.? In Step 2 above if the tinySA measured? -28.4dBm, as an example, then after Step 3 it should now be reading -30dBm and the display level values should be white instead of red (this doesn't happen immediately so you may have to wait a few seconds).
? 5.? High port calibration is complete.
? If you don't have an accurate signal generator, than you can use the procedure that Erik demonstrated to calibrate the high port.? He took advantage of the fact that the high and low port have a frequency overlap in in the 240 - 350MHz range.? You can accurately measure a signal within that range using the low port and then use that value as a transfer standard for the same signal measured on the high port in Step 3 above.
? From a serial terminal if you enter 'leveloffset'? before the high port is calibrated the tinySA should return 'leveloffset high 100'.? The '100' indicates no calibration has been performed.? In the example calibration in steps 1-4 above, if the tinySA measured -28.4dBm before calibration and -30dBm after 'ACTUAL POWER' calibration, then the 'leveloffset' command should now return 'leveloffset high -1.6'.
?In the future, again using the above steps as an example, to perform a high port calibration you could just enter the following from a serial terminal:
? 1. leveloffset high -1.6
? 2. saveconfig
? Hope that helps.
? - Herb
