3156B User Manual
Using the Instrument 3-30
Racal Instrument © 2005
In
STEP
advance mode, the sequence is advanced to the next
waveform only when a valid trigger is received. The output of the
model 3156B generates the first segment continuously until a trigger
signal advances the sequence to the next segment. If repeats were
specified in the sequence table, they are ignored in STEP advance
mode.
In
SINGLE
advance mode, the Model 3156B idles between steps until
a valid trigger signal is sensed. This advance mode is available when
the 3156B is in triggered run mode only. An attempt to select the
SINGLE advance mode when the Model 3156B is in continuous run
mode will generate a setting conflict error. After a trigger, the
generator outputs one (or more) waveform cycle(s). Then, the output
level idles at a DC level equal to the last point of the last generated
waveform. If loops (repeats) were programmed, the segment is
repeated n times automatically before it begins idling. After executing
all of the programmed loops the sequencer will step to the next
segment in the sequence when it receives its next valid trigger.
Advance source can be specified using the following function call:
ri3156B_set_carrier_run_mode
()
Note that some run modes collide may sequence operation and cause
setting conflict errors; These conditions are summarized in Table 3-1.
In general, all trigger advance sources are available for advancing the
sequence. You can use the software enable, front-panel TRIG IN
connector, or the backplane TTLTrg0-7 lines.
Using the
Modulated
Waveforms
The 3156B can be programmed to produce various modulated
waveforms such as: FM, AM, FSK, Sweep and frequency hops. Note
that when one channel is programmed to generate modulation, the
other channel can be programmed to either generate the same
modulation type or produce AC signal only. The legal conditions that
are legal for both channels if one is producing modulation are
summarized in Table 3-1.
To first step to place the instrument in modulation mode. Use one of
the following function calls:
1. The
ri3156b_set_global_operating_mode ()
– use this function call
if each channels needs to be programmed with its own
functionality
2. The
ri3156b_set_common_waveform_mode ()
– the best function
call to use if both channels need to be programmed with the same
functionality.
