FAULT PLAYBACK - Section 7
7-8 MTS-1700 SERIES OPERATION AND REFERENCE MANUAL
MANTA TEST SYSTEMS
CU A002 15A
When using the MTS-1710 + MTS-1720 to specify a set of samples for playback, the FPD command is sent,
specifying these values.
FPDDva,Dvb,Dvc,Dia,Dib,Dic
where Dva, Dvb, Dvc, Dia, Dib, and Dic are the playback values, as calculated above.
7.3.1.6 FAULT PLAYBACK IN I3-PARALLEL CURRENT MODE.
In I3-PARALLEL current mode, specify the total maximum RMS current from the three paralleled channels
using the AIA command. Then specify the playback data values using the RCD command with four values
(i.e. RCDDva,Dvb,Dvc,Di3p)
where Di3p = 127 x I3 parallel total instantaneous current ÷ (
x Maximum I3 parallel RMS current) + 128
(The Di3p value should be rounded off to the nearest integer value between 1 and 255).
In cases where the 14 bit Fault Playback is selected, specify the playback data values using the FPD com-
mand with four values (i.e. FPDDva,Dvb,Dvc,Di3p)
where Di3p = 8191 x I3 parallel total instantaneous current ÷ (
x Maximum I3 parallel RMS current) +
8192
7.4 SAMPLE RATE & ANTI-ALIAS FILTER
The sample rate for fault playback is set by using the RCR command via the RS-232C interface.
The rate is programmable from 2-30 kHz. Usually, this is set to match the sample frequency of the source
of the data (such as a digital fault recorder).
To prevent aliasing in reconstructing the fault waveform, a second order anti-alias filter is used in every
channel. The bandwidth of this filter is automatically programmed to half of the sample rate when the RCR
command is used.
Note: The frequency mode must be set to line frquency for correct waveforms playback.
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