B&K Precision 4084-4087 - Manual User Manual

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4080 series Function & Arbitrary/Function Generators –Instruction Manual

START F —> STOP F—> SPACE T —> TRIG

Enabling/disabling the burst signal

The generator outputs a burst as soon as the burst key is pressed. The instrument will automatically

output a signal according to the preset parameters. If you do not want to output the burst signal,

simply press the 【output】key to disable the signal output (LED above Output button is OFF). Once

all the parameters are set, you can make the burst signal available at the output by pressing the

Output button again. Note that the output on/off function does not apply when single trigger mode

is selected.

Burst example:

Configuration: Burst is sine wave with frequency 20kHz, amplitude 2V, 10 cycles per group,

spacing time between each group 10 ms, start phase 90.0º

Press【burst】 (enter into burst mode)

Press【frequency】, press【2】

【0】【kHz】 (set wave form frequency)

Press【amplitude】, press【2】

【V】 (set waveform amplitude)

Press【shift】and【sine】 (set waveform)

Press【menu】, select “TRIG”, press【1】

【N】 (set trigger mode as internal)

Press【menu】, select “COUNT”, press【1】

【0】【N】 (set number of bursts/cycles)

Press【menu】, select “SPACE T”, press【1】

【0】【ms】 (set space time)

Press【menu】, select “PHASE”, press【9】

【0】【N】 (set the start phase of burst)

4.6.5 FSK modulation

You can configure the function generator to “shift” its output frequency between two preset values
using FSK modulation. The rate at which the output shifts between the two frequencies (“carrier
frequency” and “hop frequency”) is determined by the internal rate generator or the signal level on
the rear-panel ext Trig/FSK/Burst terminal.

Press【FSK/PSK 】to enable FSK modulation. A preset frequency and the FSK annunciator is

displayed. The preset frequency is identical to the “START F” parameter. Any changes
automatically update “START-F” and vice versa. Frequency, amplitude, waveform and DC offset of
the carrier signal can be set as described in the previous section of this chapter. In FSK/PSK only

sine and square waves can be selected as carrier wave.

Press the 【menu】 key repeatedly to cycle through the FSK menu parameters listed below.

START F:

First frequency or carrier frequency

STOP F:

Second frequency (hop frequency)

SPACE T:

FSK rate

TRIG:

Trigger source

Trigger source “TRIG”
Select internal signal and external input signal, 1: INT or 2: EXT. The default of the instrument is