The figure below displays the spectrum analyzer settings tab.

• Fs max buffer - a drop-down list that allows the user to select the maximum sampling frequency (if greater than this setting it will be buffer reading). For example, if the maximum frequency is set to 100 KHz, i.e. for sampling frequency of 111 KHz...200 KHz it will be buffer reading and for sampling frequency Fs =100 Hz...100 KHz it will be pipe reading.
• Fs max buffer can be determined by experimenting with your system and making several measurements. First, set Fs max buffer = 200 KHz, i.e. at any sampling frequency it will be pipe reading and perform the measurements for Fs=200 KHz as well. Then check the measurements for distortion. If there is no signal distortion, this means that your computer and operating system can transfer data at the maximum speed. If there is distortion then it is necessary to reduce sampling frequency, e.g. up to 190 KHz and perform the measurements once again, repeating until you get distortion free measurment. When you have determined the sampling frequency without distortion in the measurement results, use that value for Fs max buffer. What are the reasons?
• Memory depth - when pipe reading this is determined by the available memory in the computer and in the spectrum analyzer mode it is artificially limited by 65535 samples for channel.
• Disable averaging - checking this check-box disables the increase the sampling frequency and disbales averaging for several samples (arithmetic average).
• Total number of the harmonics - determines the number of the harmonics used when calculating the harmonic distortion factor.
• Filter auto on - enables activating the corresponding filter upon setting its parameters.
• Show the reading mode information (buffer/pipe) - enables the display of information about the reading mode on the panel "Frequency".