HP 3326A Operating And Reference Manual page 122

Appendix A
MODL 86 (MODuLation) Combined operation is selected but not enabled because In-
ternal AM or PM is enabled. Disable internal modulation prior to selecting
combined operation.
MODE 87 (MODE) The requested operation or function is incompatible with the mode
selected. Select alternate mode for operation required.
2 CHANNEL mode
- synchronous PM is selected but not enabled
2 PHASE or 2 TONE mode
- internal AM or PM is selected but not enabled
- external PM is selected but not enabled
PULSE mode
- sine wave or dc only output is selected but not enabled (HP-IB)
- combined operation is selected but not enabled
- zero phase cannot be assigned to channel
B
- channel B phase offset cannot be cleared
- internal AM or PM is selected but not enabled
- external PM is selected but not enabled
FREQ
88
CMBR 89
SWFR 90
DUTY
94
SWFR 95
SWFR
96
(FREQuency) Channel B frequency is greater than 5 kHz and internal PM
is selected, or the channel B frequency is greater than 100 kHz and internal
AM is selected. Internal PM or AM is not enabled. Change the channel B
frequency prior to enabling modulation.
(CoMBineR) Combined operation is enabled and AM or PM is selected. AM
or PM is not enabled. Disable combined operation prior to selecting modu-
lation.
(SWeep FRequency) The start and stop frequencies are equal for both chan-
nels and a frequency sweep is enabled. This message appears as an advi-
sory that the HP 3326A will not appear to sweep. If a frequency sweep is
desired, change the start or stop frequencies.
(DUTY cycle) The duty cycle of a PULSE is too narrow for a sweep. Reduce
the start or stop frequency or, in the PULSE mode, change the duty cycle.
(SWeep FRequency) The high voltage option is enabled and a frequency
sweep start or stop frequency is greater than 1 MHz. Disable the high volt-
age option or decrease the sweep start or stop frequency.
(SWeep FRequency) The channel B frequency exceeds the 5 kHz internal
PM limit or exceeds the 100 kHz internal AM limit during a sweep. Disable
internal modulation or decrease the sweep start or stop frequency.