B&K Precision 4084-4087 - Manual User Manual

Page 29

4080 series Function & Arbitrary/Function Generators –Instruction Manual

TRIG —> COUNT —> SPACE T —> PHASE

described in the previous section of this chapter. The parameters carry over from the parameter

settings of the main waveforms sine and square. Press the 【menu】 key repeatedly to cycle through

the burst menu parameters listed below.

TRIG:

Trigger source

COUNT:

Number of cycles

SPACE T:

Burst time spacing

PHASE:

The starting phase of the burst

Select trigger source “TRIG”
Three trigger sources are available. Internal trigger and 2 types of external triggers sources, external

gated and single. The corresponding menu parameters are 1: INT, 2: EXT and 3: SINGLE. The

default is internal triggering.

a) Internal trigger

When the internal trigger source is selected, the frequency at which the burst is generated depends

on parameter SPACE_T, burst count and the burst carrier frequency.

b) Single trigger mode

Generate a single trigger event by pushing the 【output】key once or by applying a single TTL pulse

at the “Ext.Trig” input terminal in the rear panel. A single burst with predefined parameters will be

generated.

c) External gated burst mode
The TTL signal applied to “Ext. Trig” input terminal in the rear panel will enable or disable the
output of the generator. When the TTL level of the gate signal is high, the generated will generate

burst pulses according to the parameters of the set carrier frequency. Burst parameters COUNT and

SPACE_T are ignored in this mode. Anunciators “Trig” and “Ext” turn on when this mode is active.

Burst count “COUNT”:
Definition: The number of cycles to be output per burst.
Range: 1 ~10000 cycles in 1 cycle increments. Additionally, the minimum number of cycles must
also satisfy F

/50khz +1。

Parameter does not apply when “TRIG” is set to “EXTernal”.

Burst spacing time “SPACE T”:
Definition: Time interval between the 2 consecutive groups of bursts (time interval during which

there is no burst signal present) Parameter does not apply when “TRIG” is set to “EXTernal” or
“SINGle”.

Range: 0.1ms ~ 800s.

Starting phase of the burst “PHASE”
Burst phase: 0.0º ~ 360.0º in 0.1º increments