VTI Instruments Corp.
APPENDIX B
58
U
SING WITH
EMX-1434
This section describes how the EMX-1434 can be used together with the EMX-4250/4350/4380
instruments. See
EMX-1434 User’s Manual
for more detail information for this instrument.
Currently, EMX-1434 is configured and controlled by DSA driver. When both EMX-1434 and
EMX-4250/4350/4380 modules are included in a single DSA driver session, they work
synchronously. When the user wishes to control EMX-1434 independently from the data
acquisition, a separate driver instance must be created.
S
TIMULUS
S
IGNAL
G
ENERATION
The EMX-1434 has four DAC output channels. For stimulus-response measurement, the EMX-1434
can be used as a stimulus signal generator. Since EMX-1434 can generate four independent signals
at the same time, it can be used for MIMO (Multiple-Input-Multiple-Output) system analysis. Using
a single DSA driver session, the data acquisition and stimulus signal generation can be synchronized
together by the common trigger, sampling clock, and a state machine.
Device Under Test
Stimulus
Response
EMX-1434
EMX-4250
EMX-4350
EMX-4380
Figure 4-16: Stimulus and Response
T
ACHOMETER
I
NPUTS
The EMX-1434 has two tachometer input channels. The main application for tachometer inputs is
for rotating machinery testing. The EMX-1434 can measure instantaneous rotating speed in RPMs
from tachometer pulses connected to one of tachometer channels. The RPM values can be associated
with the EMX-4250/4350/4380 data records returned.
Some applications require acquired measurement data to be associated with a certain reference
signal phase. This signal can also be a single pulse per revolution tachometer signal. For this
application, the EMX-1434’s tachometer channel can be used as a trigger source of the
measurement.