Hi Andrew,

thank for implementing more digits for frequency resolution in the latest software update

BR
Flo

Hello, Andrew,

Thank you very much for your answer. I look forward to the next software release.
BR
Flo

Hi Justin,

thanks for your answer.

So turning off the image/spur rejection will not solve the problem?

And if I set the VBW to 1/10 of the RBW and measure below 42MHz (I measure from 20 to 40kHz or 60 to 100kHz) I dont have to substract 3dB from the measurement.

I will try it with the SA44B at first.

Hi likhil,

connect the photodiode or DUT to a current/voltage amplifier (transimpedance amplifier) the output of the amplifier, should be ac or use a dc blocking element, connect to the Signalhound.

etting Spike Software:
Trace: Type: Average
Acquisition: Video Units: Power
Detector: Average
Bandwith: RBW Shape: Flat Top
RBW:10Hz
VBW:10Hz
REF Level: -50dBm
Start: 1Hz
Stop 200kHz
Spur Reject: Off
Gain/Atten: Auto

BR
Flo

Hi Justin,

thanks for replying.
Yes the gain is 1000 volts per amp.

For example:
-120dBm to V/rt Hz than using the gain 1000V/A to get A/rt Hz

???_(???/??)=?_???−10 log⁡(???) [-120-10log(10)]
?= (√(10^((?_???−30)/10)∗?))/???? (rt(10^((-130-30)/10)*50OHm)/1000V/A
I = 5E-10A/rt Hz

Is this the way to do?

BR
Flo

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