Free Run; Gated; Triggered; Burst Operation - Hameg Instruments Hm8131-2 Handbuch

The following combinations of operational modes are
possible:

Free run

If the repetitive sweep is not activated, the generator is
free-running at the frequency displayed and available at
the signal output [12].

Gated

In the gated mode "Gat" the output signal is controlled
by a signal which is applied to the Gate/Trigger-input [3]
on the front of the HM8131-2. This mode is
asynchronous, meaning that the output signal is inde-
pendent of a time-phase relationship. An output signal
will be generated whenever the gate signal is high [TTL],
regardless of the phase condition of the generated signal.
When the Gate signal is low, no output signal occurs.
Figure 1 Output Signal Controlled by Gate

Triggered

In the single sweep mode [triggered, Trg ] the trigger
signal is also applied to the same connector [2]. This
mode is synchronous meaning that at the time of the
trigger signal the output signal will cross zero at the start.
This mode generates one or several complete signal
cycles (signal periods) depending on the duration of the
trigger signal. In this mode bursts can be generated,
however, the signal periods per burst are not
programmable.
Subject to change without notice
The trigger mode is functional with all signals within their
frequency ranges with an upper frequency limit of 500
kHz. If the duration of the trigger signal is shorter than
the output signal duration only one (complete) signal
period will be generated. A burst signal will stop at the
end of the signal period which follows the decay of the
trigger signal.
Figure 2 Triggered Arbitrary Signal

Burst Operation

Bursts are generated in the HM8131-2 only from an
external trigger signal. The HM8131-2 has to be set to
the triggered mode. The trigger signal can provided via
an interface or from another trigger generator. However,
the signal periods per burst are not programmable. A
burst signal will stop at the end of the signal period which
follows the decay of the trigger signal.

Synchronous Operation

Up to three HM8131-2 can be synchronized. Each
HM8131-2 can be a master or a slave. The synchronous
mode (when occurring) will be indicated in the main menu.
Selection and cancellation of the synchronous mode takes
place only via the operational mode menu (Mode-Menu).
When it is necessary to operate several generators at the
same output frequency, the reference frequency must be
applied to each generator. Even the excellent stability of
the internal oscillator of the HM8131-2 is insufficient for a
phase coherent control of three separate units without the
use of an external generator. The goal of synchronization of
the generators can be reached by applying an external
source (10MHz) to all generators or by using one generator
as the source of the reference signal.
The synchronization of the generators ensures a constant
phase relation between the connected generators, but
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