R3131 Spectrum Analyzer Operation Manual
2.2 Basic Operation
2-36 Apr 10/98
2.2.7 UNCAL Messages
Accurate measurements cannot be made if there is an inappropriate combination of parameters when
measuring the resolution bandwidth (RBW), the video bandwidth (VBW), the frequency span, the sweep
time and so on (the parameters for these measurements affect each other). UNCAL is displayed in the
center of the screen when a measurement cannot be made correctly.
If this occurs, perform one or more of the following procedures to correct this problem and remove UN-
CAL from the screen:
• Widen the resolution band width (RBW).
• Widen the video band width (VBW).
• Make the sweep time longer.
• If RBW or VBW cannot be changed, narrow the frequency span.
Power on
1. Turn the spectrum analyzer power on.
Initialization
This resets the current settings to the factory defaults.
2. Press SHIFT and CONFIG (PRESET).
The default settings have now been reset.
Calibration signal output
This activates the calibration signal used for the measurement.
3. Press SHIFT, 7 (CAL) and Cal Sig Level ON/OFF.
Cal Sig Level ON/OFF is turned on, and the calibration signal is output.
Setting the measurement conditions
This changes the analyzer settings so that the input signal is displayed more clearly.
4. Press FREQ, 3, 0 and MHz.
A center frequency of 30 MHz is set.
5. Press SPAN, 1, 0 and MHz.
A frequency span of 10 MHz is set and the following conditions also apply:
RBW = 100 kHz, VBW = 100 kHz and SWEEP = 50 ms.
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