Saluki S5105 Series, Руководство пользователя

Страница: 200 / 204

Tel: 886.909 602 109 Email: sales@salukitec.com
www.salukitec.com
194
products have the greatest impact on the measurement. The second-order intercept point is often
defined as IP2 or SOI (Second Order Intercept), and the third-order intercept point is IP3 or TOI (Third
Order Intercept). The calibration of interception point must specify the value of the input attenuator at the
front end of the microwave analyzer (usually 0 dB) as the intercept point will also increase as the
attenuation of the attenuator increases.
The linearity of active devices varies with the increase of current and power. In normal case, the current
supplied by the amplifier is proportional to the local oscillator power of the mixer, which will significantly
improve the linearity, so the low power consumption of the microwave analyzer is often equivalent to
poor linearity. However, it should be noted that this noise requirement is also contradictory. The input
attenuator of the microwave analyzer can control the intermodulation products, and has a higher IP3
value under a higher noise factor, so IP3 and noise factor should be analyzed and compared in the same
mode of operation. IP3, an important indicator to measure the linearity of the microwave analyzer,
reflects the size of intermodulation distortion of the microwave analyzer when it is interfered by strong
signals.
Active Function Zone
The screen area of activation function and its status display of microwave analyzer. The activation
function is the function that is activated by the last time the microwave analyzer is pressed or by the last
programmed command.
Detector Mode
The mode in which the analog information is digitized and saved into the memory is mainly used as a
display detection method for the signal energy in the microwave analyzer. The mode includes “positive
peak”, “negative peak”, “normal”, “sampling”, “average” and “Rms”.
Scale factor
The unit of value represented by each pattern on the vertical axis of the display.
Span Zero
The sweep local oscillator of the microwave analyzer is fixed at a certain frequency, that is, the local
oscillator will not sweep (the Span is equal to zero). At span zero, the microwave analyzer becomes a
fixed-tuned receiver and the bandwidth of it is the resolution bandwidth.
Drift
The local oscillator frequency is subject to the change in the sweep voltage, resulting in a slow change in
signal position on the display. If drift occurs, it may need to be re-adjusted without compromising the
frequency resolution.
Freq Resp.
The frequency response indicates the change of the amplitude with the frequency within the specified
frequency span, that is, the dependency between the amplitude and the frequency. The frequency
response is divided into an absolute frequency response and a relative frequency response. The
absolute frequency response is the amplitude deviation of the remaining frequency points when the
signal amplitude of a certain frequency point is used as a reference within a given frequency range. The
relative frequency response, also known as the frequency response flatness, represents the difference
or plus or minus one-half of the difference between the maximum amplitude and the minimum amplitude
within one frequency range or the entire frequency range.
Mkr
A visible indicating marker that can be placed anywhere on the trace of the screen, showing the absolute
value of the frequency and amplitude of the trace on the marker point with the number.
Span
The difference between the start frequency and the stop frequency on the microwave analyzer. The
setting of the span determines the scale of the horizontal axis of the microwave analyzer display.
Frequency range
The range between the min. frequency and max. frequency that can be measured by the microwave
analyzer under the specified performance conditions. The frequency span and relevant frequency band