User manual

Publication No. 980935 Rev. M 3152B User Manual
Astronics Test Systems Operation 3-7
Selecting an
Output
Function
The 3152B has four basic output function types.
Use the following
commands to select the waveform type:
func:mode fix The 3152B outputs the standard
waveform currently selected by the
FUNC:SHAP command
(default sine, 1
MHz, 5Vp-p).
func:mode user T
he 3152B outputs the arbitrary waveform
currently selected by the TRAC:SEL
command (default trace is 1).
func:mode seq Selects the Sequenced W
aveform
function. Waveform segments must be
downloaded to the instrument before it
can sequenced generate waveforms.
In
addition, the SEQ:DEF command must be
used to define the sequence.
When programming a waveform function, you must consider the run
mode, since combinations of waveform types
that are legal in one
mode may not be legal in a different mode.
For example, arbitrary
and sequenced waveforms that do not conflict in C
ontinuous mode
may conflict in Burst mode.
Selecting
a Run
Mode
The 3152B offers five run modes:
• Continuous
• Triggered
• Re-triggered
• Gated
• Burst
In Continuous mode, the 3152B repeats the
selected waveform
continuously. The other four modes are known as interrupted
, that
is, the output does not generate waveforms until an
event initiates a
single- or multiple-output cycle.
Interrupted modes require a single trigger or multiple triggers
to
initiate output cycles. Trigger events come from various inputs,
such
as VXIbus backplane trigger lines or the front-
panel connector.
Information on selecting a run mode and trigger source
is given in
the following paragraphs.
Use the following commands to select run modes:
init:cont on Selects Continuous mode. This is t
he
default state
of the instrument. Use this
command to return to Continuous run
mode from any other interrupted mode.
init:cont off De-selects Continuous mode. If you did