UNI-T UTS3000B/A Series User Manual page 70

Offset Side: Specifies which offset side to measure.NEG,Negative (lower) sideband only.POS,Positive
(upper) sideband only.Both,Both of the negative (lower) and positive (upper) sidebands.
Meas Preset: Reset all parameters of the current measuring mode to factory setting.
Spectrum Monitor
5-6
Figure Spectrum Monitoring
Horizontal axis is frequency, vertical axis is time, and color presents the energy size of spectrum.
It is used to detect the intermittent occurrence of the spectrum, and the spectrum monitoring can
observe the change of the signal in a period of time.
Press [Meas] >Spectrum Monitor to enter the following panel menu.
Meas/Setup:
Avg|Hold Num（On/Off）: Press average time (on) to specify the average number of sweep to
calculating the measurement results. Sweep time range is from 1 to 999. User can change the average
time by using the numeric key, rotary knob, direction key, or touch the panel menu. Measured average
result will be displayed after the sweeping. Select (off) to turn off this measuring average function.
Avg Mode （Exponential/Repeat） : Switch between exponential and repetition average mode. When the
specified average time of sweep is reached, this average mode is used to determine the average
operation mode of the spectrum analyzer.
When the exponential average mode is selected, after a specified average time is reached, each
channel trace data is weighted exponentially, added to the previous average value and then take the
average. In the exponential average mode, the weight of the new data is larger than that of the old data,
which is conducive to track signals that change slowly. Measured average result will be displayed after
the sweeping.
When the repetition average mode is selected, after a specified average time is reached, all the previous
data will be delete and restart the sweeping.
70 / 78