Directed Electronics PDG-2515/2520

PDG-2515/2520 Operating Manual

Page 33 MNPDG2515-2520R0.doc

Burst Mode

In Burst Mode, a set number of pulses (the burst packet) are output from

OUT1. Each burst packet is sent at the packet frequency. The burst

packet will start ONE period of the burst packet frequency after the rising

edge of the packet frequency (OUT 2 will ALWAYS output the packet

frequency at a limited duty cycle and cutoff any length of burst after that

length of time). The software will not check to check timing constraints in

this mode, meaning that if the timing if violated, the output may be

erroneous and not predictable (only while the constraints are violated – for

example if the number of bursts exceeds the time period of the packet

frequency this would violate the hardware of the unit). Violating the timing

can be a number of things such as a burst frequency larger than the

packet frequency, more pulses/delays than allowed in a single packet so

that timing overlaps, etc. The timing constraints are left up to the user’s

configurations so that the unit may be used to it’s full potential, however

the user may want to output a signal that does not violate any timing

constraints to receive a correct burst and frequency. OUT 3 and OUT 4

are not available in this mode, they will stay at DC levels.

Figure 16 Example: Burst Mode

Single Shot Mode

In this mode, the pulse widths and the pulse delays can be set to their

maximum values without any timing constraints. After the OUTPUT button

is depressed, the OUTputs will generate a single pulse according to the

individual channel settings.