HP 8560E Service Manual page 304

number identification in the spectrum analyzer
firmware.
302 OFF UNLK Offset roller oscillator PLL is unlocked. May indicate
loss of 10 MHz reference. The 10 MHz reference should
measure greater than −7 dBm at A15J303. The ADC
measures OFFSENSE at the beginning of each sweep
and, if the voltage is outside certain limits, the offset
oscillator pretuned DAC is adjusted to bring
OFFSENSE within the proper range. ERR 302 is set if
this cannot be accomplished. This error is not
applicable to HP 8560 E-series or EC-series spectrum
analyzers. If it occurs in an HP 8560 E-Series spectrum
analyzer, suspect a problem with the model number
identification in the spectrum analyzer firmware.
303 XFR UNLK Transfer roller oscillator PLL is unlocked. May
indicate loss of 10 MHz reference. The 10 MHz
reference should measure greater than −7 dBm at
A15J303. The ADC measures XFRSENSE at the
beginning of each sweep and, if the voltage is outside
certain limits, the transfer oscillator pretuned DAC is
adjusted to bring XFRSENSE within the proper range.
ERR 303 is set if this cannot be accomplished. This
error is not applicable to HP 8560 E-series or EC-series
spectrum analyzers. If it occurs in an HP 8560 E-series
or EC-series spectrum analyzer, suspect a problem with
the model number identification in the spectrum
analyzer firmware.
304 ROL UNLK Main roller oscillator PLL is unlocked. May indicate
loss of 10 MHz reference. The 10 MHz reference should
measure greater than −7 dBm at A15J303. The ADC
measures MAINSENSE at the beginning of each sweep
and, if the voltage is outside certain limits, the main
roller pretune DAC is adjusted to bring OFFSENSE
within the proper range. ERR 304 is set if this cannot
be accomplished. This error is not applicable to HP
8560 E-series or EC-series spectrum analyzers. If it
occurs in an HP 8560 E-series or EC-series spectrum
analyzer, suspect a problem with the model number
identification in the spectrum analyzer firmware.
305 FREQ ACC Unable to adjust MAINSENSE close to 0 volts using
the coarse adjust DAC. The coarse adjust and fine
adjust DAC are used together to set MAINSENSE to 0
volts with the loop opened. ERR 305 is set if the coarse
adjust DAC cannot bring MAINSENSE close enough to
0 volts for the fine adjust DAC to bring MAINSENSE to
exactly 0 volts. This error is not applicable to HP 8560
E-series or EC-series spectrum analyzers. If it occurs in
Chapter 6
System Analyzer Programming Errors (100 to 150)
General Troubleshooting
303