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6-10
2715 Spectrum Analyzer Service Manual
Table 6- 2: Cal Debug Messages and Meanings (Cont.)
Message Meaning
“ERROR in VCO SENS @ 13 MHz: Cannot calculate result” The LF VCO DAC calculator failed to find a proper VCO sensitivity
when given a frequency of 13 MHz. This should never happen if
the Upper VCO normalization worked properly.
“ERROR in VCO SENS @ 13 MHz: Result out of range” The calculated result for this test was outside reasonable limits.
“ERROR in MAIN DAC OFFSET: Cannot center start spur” Beginning at 10 MHz/div span, the st art spur was located and
centered, then span was reduced. In 1 MHz/div span, the signal
could not be centered within 30 horizontal storage bits.
“ERROR in MAIN DAC OFFSET: Cannot count beat frequen-
cy (1)”
The beat frequency was connected to the counter, but an attempt
at counting was unsuccessful. This attempt occurred when the
start spur was within 300 kHz of center screen, producing a beat
frequency of approximately 5 MHz.
“ERROR in MAIN DAC OFFSET: Cannot set main DAC low
enough”
To actually center the start spur, a DAC value <1 was requested.
“ERROR in MAIN DAC OFFSET: Cannot count beat frequen-
cy (2)”
The beat frequency was connected to the counter, but an attempt
at counting was unsuccessful. This attempt occurred when the
start spur was within 300 kHz of center screen, producing a beat
frequency of approximately 5 MHz.
“ERROR in MAIN DAC OFFSET: Result out of range” The calculated result for this test was outside reasonable limits.
“ERROR in MAIN DAC SENS: Cannot count beat frequency (3)” The beat frequency should have been around 10 MHz, but was
not countable. This count was done at approximately 900 MHz CF.
“ERROR in MAIN DAC SENS: YIG cannot be counted at 100% of
CF range”
The 1st LO frequency could not be determined after a series of LF
VCO and beat frequency counts. This was tried at approximat ely
0 MHz (2110 M Hz 1st LO frequency).
“ERROR in MAIN DAC SENS: YIG cannot be counted at 80% of
CF range”
The 1st LO frequency could not be determined after a series of LF
VCO and beat frequency counts. This was tried at approximat ely
1440 MHz (3550 MHz 1st LO frequency).
\ERROR in MAIN DAC SENS: Result out of range (1)” The intermediate result predicted a main DAC value greater than
4095 at 1800 MHz.
“ERROR in MAIN DAC SENS: YIG cannot be counted at 100% The 1st LO frequency could not be determined after a series of LF
VCO and beat frequency counts. This was tried at approximat ely
1800 MHz (3910 MHz 1st LO frequency).
“ERROR in MAIN DAC SENS: Result out of range (2)” The final value calculated is outside reasonable limits.
“ERROR in MAIN DAC SENS: YIG cannot be counted at 50% of
CF range”
The 1st LO frequency could not be determined at 900 MHz CF.
ERROR in FM DAC SENS: Cannot set strobe to required
frequency”
The strobe frequency could not be set to a known frequency.
“ERROR in FM DAC SENS: Cannot count beat frequency (1)” Failed to count the beat frequency while trying to set the 1st LO t o
a specific position (5 MHz).
“ERROR in FM DAC SENS: Cannot set beat frequency DAC” Five attempts have failed to set the beat frequency to the main
with proper location.
“ERROR in FM DAC SENS: Cannot count beat frequency (2)” The beat frequency could not be counted when the FM DAC was
set to 1.