NOVATECH INSTRUMENTS 11 409C Manual Rev 1.12
4.19 Table Synchronization with External Events.
For precision timing application it is recommended that
external table synchronization be used. This involves
triggering table operations using customer supplied ex-
ternal hardware. See Section 9 for detailed instructions.
4.20 Frequency Sweeping. 409C Models with firmware
version 1.6 or higher have a sweep feature that enables
the user to set a begin frequency and an end frequency
for each output channel (n = 0,1,2,or 3) and then perform
one of the following sweep modes:
1) Ramp up and Ramp down (set with command
‘SWMDn D’).
2) Ramp up and step down (set with command
‘SWMDn S’).
4.21 Set Up a Sweep. The beginning frequency is set
using the ‘Fn xxx.xxxxxxx’ command. The ending fre-
quency must be larger than the beginning frequeny and is
set using the ‘SWEFn xxx.xxxxxxx’ command.
The frequency step size is programmable when ramping
up and also when ramping down . The ramp up frequen-
cy step size is set by the ‘SWRSFn xxx.xxxxxxx’ com-
mand and the ramp down frequency step size is set by
the ‘SWFSFn xxx.xxxxxxx’ command.
The time duration of each step is programmable when
ramping up and also when ramping down. The step time
duration when ramping up is set by the ‘SWRSTn t’
command and the step time duration when ramping
down is set by the ‘SWFSTn t’ command.
The parameter ‘t’ above can be from 0.009 microseconds
to 2.2 microseconds when using the internal clock or
the /R option. When using an external reference or direct
clock the parameter “t” has a minimum of 4/Fs and a
DUAL SWEEP MODE CHANNEL 0
Point 1 shows the Trigger point to start the rising sweep
Point 2 shows the trigger point to start the falling sweep
F0 Beginning & Ending Frequency
RST0 Rising Step Time
RSF0 Rising Step Frequency
EF0 End of Rising Frequency
FSF0 Falling Step Time
FST0 Falling Step Frequency Channel 0
SINGLE SWEEP MODE CHANNEL 0
Point 1 shows the Trigger point to start the sweep
F0 Beginning & Ending Frequency
RST0 Rising Step Time
RSF0 Rising Step Frequency
EF0 End of Rising Frequency
F0
RST0
RSF0
F0
EF0
1
RST0
RSF0
F0
F0
EF0
2
1
FST0
FSF0
TIME
FREQUENCY
Single Ramp Mode
Dual Ramp Mode
NOTE: Sweep commands start with SW. Thus, to set the rising
step time of channel 0 to 1 microsecond the command would be
SWRST0 1
FREQUENCY SWEEP MODES
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