Novatech 409C - Page 6

NOVATECH INSTRUMENTS 6 409C Manual Rev 1.12
Command Function
SWENBn x
Enable Sweeping. n = Output channel number, x = E for enable or x = D for disable
SWEFn xxx.xxxxxxx
Ending Frequency. n = Output channel number, xxx.xxxxxxx = Ending frequency in MHz.
(Beginning frequency is set by the Fn xxx.xxxxxxx command)
SWRSFn xxx.xxxxxxx
Rising Frequency Step Size. n = Output channel number, xxx.xxxxxxx = Frequency step
size in MHz
SWFSFn xxx.xxxxxxx
Falling Frequency Step Size. n = Output channel number, xxx.xxxxxxx = Frequency step
size in MHz
SWRSTn t
Rising Time Step Size. n = Output channel number, t = Step size in Microseconds
SWFSTn t
Falling Time Step Size. n = Output channel number, t = Step size in Microseconds
PPn x
Set Trigger Logic Level. n = Output channel number, x =0 sets trigger Low or x = 1 sets
trigger high.
SWMDn x
Sweep Mode. n = Output channel number, x = S sets single ramp up step down, x = D sets
dual ramp up and ramp down.
PPn x
Use connector J8 for Triggers. n= Output channel number, x=x sets trigger source to ris-
ing and falling 3.3V signals on J8 pins 5,6,7 and 8. See paragraph 3.9.
Table 3: Serial Commands For Frequency Sweeping
(Not Case Sensive)
Example of Single Sweep from 10MHz to
60MHz in 10 seconds on Channel 0
Send the following commands: f0 10, swef0 60,
swrst0 2, swrsf0 0.00001, swenb0 e, swmd0 s.
Trigger a sweep from software by sending the fol-
lowing commands: pp0 0 then pp0 1.
Trigger a sweep from connector J8 by sending the
command pp0 x and then apply a rising 3.3 volt
signal to J8 pin 5.
NOTE: Sweep time is 50MHz/10Hz per step =
5,000,000 steps times 2 mS/step = 10 seconds.
Example of Dual Sweep from 10MHz to
60MHz to 10MHz on Channel 0
Send the following commands: f0 10, swef0 60,
swrst0 2, swfst0 2, swrsf0 0.00001, swfsf0 0.00001,
swenb0 e, swmd0 d.
Trigger a sweep in software by sending the following
commands: pp0 0 then pp0 1 (starts rising sweep)
then send pp0 0 (starts falling sweep).
Trigger a sweep from connector J8 by sending the
command pp0 x and then apply rising and falling 3.3
volt signals to J8 pin 5.