Lindos LA100 - Page 146

Graph Handles
When reading textual results using the SR? command, described above, it is possible to
include embedded graph handles in the results text by setting bit 1 in the option number.
This adds a ^ symbol and a graph handle, for each channel, to the end of each frequency
response segment title. For example:
FREQUENCY RESPONSE [X] 0dB^1^2
30Hz -1.11 -1.11
40Hz +0.55 +0.55
50Hz +0.55 +0.55
In this example, there are frequency response results for two channels, so two handles are
given. The handle number should be quoted in the S?n command (see below), where n
represents the graph handle. Extending the S? command in this way allows multiple sets
of frequency response results to be read from an LA102 (note that the results may contain
up to 10 graphs if configuration C5 has been set in the LA102 − see section 4.18.
Read Frequency Sweep Results: 2S?r
S? Read sweep results
Although the results text returned by 2SR? includes frequency response results, only a
few frequencies are included because the full list would be very long. These frequencies
are the same as for normal printouts and Table 3.2 on page 40 lists the frequencies for
each frequency response segment. Attempting to use these few values to plot a frequency
response graph would produce very crude results.
The S? command returns all of the 256 point frequency response results for register r
(normally 1 for L channel, or 2 for R channel). The actual samples are returned in binary
to minimise the data transfer. At 9600 baud, the data for two frequency response graphs
takes 1s to transfer using this binary format, compared to the 6s it would take using
ASCII decimal.
146
9. Remote Control
LINDOS AUDIO SEQUENCE TEST
SOURCE 0518E LA102 0518 V6.0
SEGMENTS +TDZ TD
TEST LEVEL OUT [T] 0dB
+0.01 -6.65dBu
DISTORTION (2f-22k) [D] +8dB
100Hz -87.9 -89.0
1kHz -89.5 -91.4
6.3kHz -84.4 -88.3
PHASE (mean) [Z] 0dB
40Hz -4d
100Hz -5d
1kHz -11d
6.3kHz -42d
10kHz -58d
LINDOS AUDIO SEQUENCE TEST
SOURCE 0518E LA102 0518 V6.0
SEGMENTS +TDZ TD
TEST LEVEL OUT [T] 0dB
, +0.01 , -6.65dBu
DISTORTION (2f-22k) [D] +8dB
100Hz , -87.9 , -89.0
1kHz , -89.5 , -91.4
6.3kHz , -84.4 , -88.3
PHASE (mean) [Z] 0dB
40Hz , -4d
100Hz , -5d
1kHz , -11d
6.3kHz , -42d
10kHz , -58d
Fig. 9.5 Results text read by SR?3 (left) and same results text in CSV form
read by SR?7 (right)