Lindos LA100 - Control Segments

directly into the LA100 without a computer as the small, low resolution characters can be
confusing to new users, but they are soon learnt, and the segment description provided by
the LA101 can always be used as a confirmation.
When designing a sequence you should choose the measurements that you want to
include from the list shown in fig. 3.2 (page 40), and refer to the sections below for
further details on each segment.
Normally sequences will only contain one segment for each type of measurement (eg one
frequency sweep, one distortion measurement etc). However, it is possible to include
more than one segment of each type providing the LA102 memory is configured (by
setting configuration C) before the sequence is received, otherwise, a
SEQUENCE
ERROR 12
will result. See section 4.18 for further details.
The sequence may be up to 250 characters long (most sequences contain typically 10
segments, but messages and long lists of tone specifications can make them much longer).
It is possible to include messages of up to 21 characters within double quotes (") which
are displayed on the LA101 when the sequence is run. The PPM test sequence displays
the target values before each tone burst using message segments. The messages are
displayed as encountered and if referring to a segment should be placed before the
segment letter so that the message is displayed while sending the segment. The message
will remain on the display until another message segment is encountered. To clear a
message, simply use an empty message segment, ie "".
In addition to the test segments the sequence can include control segments (which are
allocated symbols, such as < % > ! etc). The message segment described above is a
typical example, and other control segments are provided, as shown in table 4.1. They
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4. User Defined Sequences
Control Segments
!f,d,l Tone bursts/tone sets. !frequency,duration,level,frequency,duration... (section 4.16)
+"txt" Send txt message to the LA102 measuring set, up to 21 characters (section 4.3)
"txt" Display txt message on the LA101 display, up to 21 characters (section 4.1)
< Repeat last segment, until interrupted by a key press (section 4.17)
Repeating segment
<< Repeat whole sequence, until interrupted by a key press (section 4.17) Repeating sequence
±n Select tolerance n (1-20) in the LA102 (section 4.19) Selecting a tolerance
%n,m Set output impedance n (10, 75 or 600) in ohms and ZC mode m (section 4.20)
/n Set oscillator test level to ndB. (section 4.21)
:n,m Select physical output channel n and logical channel m (section 4.22)
physical channel
>n Run sequence n as a sub-sequence and then continue (section 4.23)
? Pause until a key is pressed on the LA101 (section 4.24)
^n Set sweep headroom to ndB. (section 4.25)
\n LA102 to subtract reference curve in memory n from sweep results (section 4.26)
-"txt" Generate O.33 compatible FSK header (section 4.28)
=n Select weighting to be applied to sequence (section 4.29)
Table 4.1 Control Segments