PeakTech 4035 Bedienungsanleitung Seite 99

8.7.1 Burst period: it represents time from the start of one burst to start of the next one and must be big
enough in order to output the specified number of cycles, as the following formula shows:
Burst period＞burst count ÷ signal frequency
If the burst period setting is too small, the instrument will modify it to the allowable minimum value. The burst
period setting range is 1μs～500s.
8.7.2 Burst count: it represents the number of cycles to be outputted per burst. It must be small enough in
order to be outputted in one burst, as following formula shows:
Burst count＜burst period × signal frequency
If the burst count setting is too big, the instrument will modify it to the allowable maximum value. The burst
count setting range is 1～999999.
8.7.3 Burst phase: it represents the starting phase and the end phase of the burst. The burst phase setting
range is 0°～360°, which is not available to square wave.
8.7.4 Burst type: press 〖Cont Swp〗softkey to select "continuous burst", "single burst" or "gated burst".
In the continuous burst mode, the generator uses internal continuous trigger source to output continuous
bursts according to burst period and burst count set in advance.
In the single burst mode, you can use manual trigger to produce a burst. Once you press〖ManuTrigr〗
softkey, the generator outputs an burst, then resets back to the starting phase point to wait the next trigger.
You can also use external trigger source, input TTL trigger signal from the instrument rear panel "Trig In"
connector. The generator outputs a burst at the rising edge of the trigger signal and resets back to the
starting phase to wait the next rising edge. Of course, the trigger signal cycle should conform to the
restricted conditions of burst period. In the single burst mode, the burst period setting is ignored.
In the gated burst mode, once you press 〖ManuTrigr〗softkey, the current waveform will be outputted
continuously (not burst), press 〖ManuTrigr〗again, the output will stop, then the instrument resets back to
the starting phase point to wait the next keystroke. It is able to use external trigger source, a TTL gated
signal is inputted from the instrument rear panel "Trig In" connector. When the gated signal is at logic high
level, the waveform is outputted continuously (not burst), when gated signal is at logic low level, the output
stops, then the instrument resets back to the starting phase point. In the gated burst mode, both burst period
and burst count settings are ignored.
8.7.5 Sync output:
Regardless of in the continuous burst mode, single burst mode or gated burst mode, a sync signal can be
outputted from the front panel "Sync" connector. It is a TTL level's pulse signal, its rising edge is
corresponding to the burst starting phase point, and the falling edge is corresponding to the end of the
specified number of cycles. That is to say, the sync signal is a TTL high when the current waveform is
outputted in the specified number of cycles and is a TTL low when the specified number of waveform is
completed.
8.8 To set the burst output (P 4050)
In burst mode, you can set the burst repeated period, the number and the start phase of each burst. Follow
the steps to set a FSK waveform with 20 ms burst period, two pulses burst count and 180° start phase.
First, to set the sine waveform with 1 kHz frequency and 1Vpp amplitude.
-98-