Chapter 14 627
Analyzer Messages
Interpreting Analyzer Messages
The default data introduces frequency offsets that can make an
accurate CAL OUT signal appear to be outside the test limits for the
CAL OUT check. If desired, the instrument CAL OUT check can be
bypassed. Enter the −37 Hz passcode before pressing
CAL and the
desired self-calibration softkey.
Refer to the description of DEFAULT CAL DATA in Chapter 13 for
additional information.
• The analyzer has extremely low gain. Refer to Chapter 4.
Be sure to perform all internal self-calibration routines after resolving
the calibration signal problem. Refer to the calibration guide for your
instrument.
NOTE Instrument firmware expects the cal output signal to be 300 MHz
± 2 MHz. Sometimes the instrument default data is not able to tune the
cal signal within this range and a “cal signal not found” message may
appear on screen. Perform a cal output bypass check by pressing
Frequency, -37, Hz, Cal, Cal Freq. This will bypass the cal check and start
by calibrating the sweep ramp.
CAL: SPAN SENS FAIL (H)
During the CAL FREQ self-calibration routine the main-coil
span-sensitivity adjustment routine has failed, indicating that the
spans controlled by the main coil (LO spans greater than 10 MHz) are
not working correctly. The span-sensitivity adjustment routine checks
for three displayed signals: 0 Hz, 300 MHz, and 600 MHz. If three
signals are not found in a 750 MHz span, the error message is
displayed.
Related Assemblies
8590L and 8591E spectrum analyzers only: A6 YTO, A7 analog
interface, A9 third converter, A16 processor/video assembly.
All other 8590 E-Series and L-Series spectrum analyzers: A3A7 YTO,
A7 analog interface, A9 third converter, A16 processor/video assembly.
Troubleshooting Hints
Spurious signals can cause this routine to fail.
Refer to the
MAIN SPAN softkey description for further information in
Chapter 13.
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