Agilent Technologies E1441A Sweep Start and Stop Frequencies, •“Sweep Trigger Source” on page

FSKey:SOURce EXTernal	select ext FSK source
TRIGger:SOURce EXT TTLT<0-7>	now select which ext source

Frequency Sweep In the frequency sweep mode, the function generator “steps” from the start frequency to the stop frequency at a sweep rate which you specify. You can sweep up or down in frequency, and with either linear or logarithmic spacing. You can also configure the function generator to output a single sweep (one pass from start frequency to stop frequency) by applying an external trigger. The function generator can produce a frequency sweep for sine, square, triangle, ramp, or arbitrary waveforms. Topics covered on frequency sweep are:

•“Sweep Start and Stop Frequencies” on page 43

•“Sweep Time” on page 43

•“Sweep Mode” on page 44

•“Sweep Trigger Source” on page 44

Sweep Start and Stop Frequencies

Only one modulation mode can be enabled at a time. When you enable the sweep mode, the previous modulation mode is turned off.

Use the following command to enable the frequency sweep: To ensure proper operation, you should enable the sweep mode after you have set up the other modulation parameters.

SWEep:STATe OFFON

The start frequency and stop frequency set the upper and lower frequency bounds for the sweep. The function generator begins at the start frequency, sweeps to the stop frequency, and then resets back to the start frequency.

Start and Stop frequencies: 10 mHz to 15 MHz (100 kHz for triangle and ramp). The sweep is phase continuous over the full frequency range. The default start frequency is 100 Hz. The default stop frequency is 1 kHz. The *RST command sets the start frequency to 10 mHz (minimum) and the stop frequency to 15 MHz (maximum).

For arbitrary waveforms, the maximum start or stop frequency depends on the number of points specified in the waveform. The five built-in arbitrary waveforms can be output at a maximum of 5 MHz.

To sweep up in frequency, set the start frequency < stop frequency. To sweep down in frequency, set the start frequency > stop frequency.

The sync signal is a TTL “low” at the start of the sweep (when the start frequency is output) and is a TTL “high” at the end of the sweep (when the stop frequency is output). The signal is output from the front-panel SYNC terminal.

Use the following command set the start and stop frequencies:

FREQuency:STARt <frequency>MINimumMAXimum FREQuency:STOP <frequency>MINimumMAXimum

Sweep Time The sweep time specifies the number of seconds required to sweep from the

Chapter 2 Agilent E1441A Application Information 43