Hi all,
I am having trouble measuring noise figure and figured that I would start by looking first at the calibration. I am getting a variation of ~8dB after measuring the device, this is after cal and without any loss compensation. The device should be reading around 8dB, but I get 30ish. I assume that the higher reading is due to the test setup not being taken into account during the calibration (cable, connector loss...etc), but I am not sure why I am getting such a large variation. I calibrate simply by plugging the noise source into the input and pressing the calibrate button or should I be going through my test setup instead?
I am measuring noise figure on mixer diodes using the following setup:
N8973A analzyer
N5183A signal gen
346B noise source
Waveguide fixturing
Preamp tuned to 30MHz
Test conditions:
LO 9.375GHz (1mW of power)
IF 30MHz
I am having trouble measuring noise figure and figured that I would start by looking first at the calibration. I am getting a variation of ~8dB after measuring the device, this is after cal and without any loss compensation. The device should be reading around 8dB, but I get 30ish. I assume that the higher reading is due to the test setup not being taken into account during the calibration (cable, connector loss...etc), but I am not sure why I am getting such a large variation. I calibrate simply by plugging the noise source into the input and pressing the calibrate button or should I be going through my test setup instead?
I am measuring noise figure on mixer diodes using the following setup:
N8973A analzyer
N5183A signal gen
346B noise source
Waveguide fixturing
Preamp tuned to 30MHz
Test conditions:
LO 9.375GHz (1mW of power)
IF 30MHz
Vladan