Chapter 14 647
Analyzer Messages
Interpreting Analyzer Messages
MEAS UNCAL (U)
The measurement is uncalibrated. Check the sweep time, span, and
bandwidth settings, or press
AUTO COUPLE, AUTO ALL.
No card found (U)
Indicates that the memory card is not inserted.
No points defined (U)
Indicates the specified limit line or amplitude correction function
cannot be performed because no limit line segments or amplitude
correction factors have been defined.
MIXER BIAS CAL FAILED
This message applies to 8592L, 8593E, 8595E, and 8596E spectrum
analyzers only.
During the CAL MXR routine, the comb signal was not found at the
displayed center frequency.
Related Assemblies
A3A1 comb generator, A3A11 step-recovery diode, A3A12 3dB
attenuator, J2 connector.
Troubleshooting Hints
• Make sure that the 100 MHz COMB OUT is connected to the
analyzer input using the comb generator cable (SMA to Type N)
supplied with the analyzer. (A comb generator cable (SMA to SMA)
is supplied with Option 026 instruments.)
• Perform the following steps to verify the comb-generator output
manually.
1. Press the following keys.
PRESET
FREQUENCY, 100, MHz
SPAN, 500, MHz
2. Look for the 100 MHz comb-generator signal to the right of the
local oscillator signal. When
COMB GEN ON OFF is OFF, this
signal has an amplitude of approximately −8 dBm and the
100 MHz harmonics are less than −20 dBc.
3. Press the following keys.
AUX CTRL
COMB GEN ON OFF (On)
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