DS335 Synthesized Function Generator
DS335 Synthesized Function Generator
DS335 Synthesized Function Generator
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Programming Commands 3-5<br />
*TRG<br />
The *TRG command triggers a single sweep. The trigger source must be set<br />
to SINGLE (see the TSRC command below).<br />
SDIR()i Sets the sweep direction. 0 = Ramp (unidirectional), 1 = Triangle<br />
(bidirectional), 2 = enable FSK (disable sweeps).<br />
STYP () i<br />
The STYP command sets the sweep type to i. The correspondence of i to<br />
type is shown in the table below. The STYP query returns the current<br />
sweep type. Refer to the SDIR command for sweep direction.<br />
i Waveform<br />
0 LIN SWEEP<br />
1 LOG SWEEP<br />
SPFR () x<br />
SRAT () x<br />
STFR () x<br />
SWEN() i<br />
TSRC () i<br />
The SPFR command sets the sweep stop frequency to x Hertz. An error will<br />
be generated if the sweep frequency is less than or equal to zero or greater<br />
than allowed by the current function. The SPFR query returns the current<br />
sweep stop frequency. If the stop frequency is less than the start frequency<br />
(the STFR command) a downward sweep from maximum to minimum<br />
frequency will be generated. The stop frequency is also used in the FSK<br />
mode.<br />
The SRAT command sets the trigger rate for internally triggered single<br />
sweeps and FSK to x Hertz. x is rounded to two significant digits and may<br />
range from 0.01 Hz to 1 kHz for sweeps and 0.01Hz to 50kHz for FSK. The<br />
SRAT query returns the current trigger rate. If the rate is set to 0Hz and<br />
FSK is enabled (SDIR = 2) then the external FSK BNC is used to toggle<br />
between the start and stop frequencies.<br />
The STFR command sets the sweep start frequency to x Hertz. An error will<br />
be generated if the sweep frequency is less than or equal to zero or greater<br />
than allowed by the current function. The STFR query returns the current<br />
sweep start frequency. If the start frequency is greater than the stop<br />
frequency (the SPFR command) a downward sweep from maximum to<br />
minimum frequency will be generated. The stop frequency is also used in the<br />
FSK mode.<br />
Enables sweeps on (i=1) or off (i=0). If the continuous sweep is selected,<br />
enabling sweeps will start the sweep with the specified rate. If triggered<br />
single sweep is selected and sweeps are enabled then the <strong>DS335</strong> waits for a<br />
front panel trigger or a *TRG command to start the sweep.<br />
The TSRC command sets the trigger source for sweeps to i. The<br />
correspondence of i to source is shown in the table below. The TSRC<br />
query returns the current trigger source.<br />
i Waveform<br />
0 SINGLE<br />
1 INTERNAL RATE<br />
For single sweeps the *TRG command triggers the sweep.<br />
<strong>DS335</strong> <strong>Synthesized</strong> <strong>Function</strong> <strong>Generator</strong>