FSKey:FREQuency <frequency>MINimumMAXimum

Use the following command to set the frequency:

FREQuency <frequency>MINimumMAXimum

You can also use the APPLy command to select the function, frequency, amplitude, and offset of the carrier with a single command. Because the APPLy command also changes duty cycle, modulation type, trigger source, and trigger slope, you must place the APPLy command first in any sequence of configuration commands.

FSK “Hop” Frequency Hop frequency: 10 mHz to 15 MHz (100 kHz for triangle and ramp). The default is 100 Hz. You can use sine, square, ramp, triangle, or arbitrary waveforms for the hop frequency waveshape.

For arbitrary waveforms, the maximum hop 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.

Table 2-9.

 

 

 

 

 

 

Number of Arb Points

Minimum Frequency

Maximum Frequency

 

 

 

 

 

 

 

8 to 8,192 (8k)

100 mHz

5 MHz

 

 

 

 

 

 

 

8,193 to 12,287 (12k)

100 mHz

2.5 MHz

 

 

 

 

 

 

 

12,288 to 16,000

100 mHz

200 kHz

 

 

 

 

 

 

 

 

 

 

 

For an externally-controlled FSK waveform, the carrier frequency is output when a “low” TTL level is applied to the FSK terminal. The hop frequency is output when a “high” TTL level is applied.

For FSK, the sync signal is referenced to the FSK “hop” signal (not the carrier). A momentary TTL “high” pulse (> 200 ns) is output on the transition to the “hop” frequency. The signal is output from the front- panel SYNC terminal.

Use the following command to set the FSK frequency:

FSKey:FREQuency <frequency>MINimumMAXimum

FSK Rate The FSK rate is the rate at which the output frequency “shifts” between the carrier frequency and the hop frequency when you select the internal FSK source (FSK:SOUR INTernal).

FSK rate (internal source): 10 mHz to 50 kHz. The default is 10 Hz.

The FSK rate is ignored when the external source is selected.

Use the following command to set the FSK rate:

FSKey:INTernal:RATE <rate in Hz>MINimumMAXimum

Chapter 2

Agilent E1441A Application Information 41

Page 41
Image 41
Agilent Technologies E1441A Use the following command to set the frequency, Use the following command to set the FSK rate