35
Signametrics
posi
lectable edge
parameter. Read about
g
ers the DMM at a specific input level. A command to the DMM sets a threshold value and arms the
MM Analog trigger. The DMM’s local controller waits for the level crossing and captures up to 64 readings,
which are saved on board; at the current DMM measurement function, range and rate. The reading rate must be set
ith
or without setteling readings. These include
DMMSetBuffTrigRead
,
DMMSetTrigRead
,
DMMTrigger
,
DMMBurstRead,
and
DMMBurstBuffRead
. Read about these functions in the Windows Command Language
section (5.6) for details.
4.11.4 Using the PXI bus Trigger Facilities
The SMX2040 series of Digital Multimeters are designed to interface to the PXI J2 Triggers. That includes the
PXI_TRIG0 through PXI_TRIG6 and PXI_STAR trigger. The trigger to the DMM is a Wire-Ored function of the
external trigger from the DIN-7 connector, and the PXI_TRIGn input. The data ready signal from the SMX2040
series can be selected to drive PXI_TRIG1 through PXI_TRIG6 or PXI_STAR trigger. Read section 4.10.1 to
prevent Trigger input conflicts.
tive edge
,
DMMSetBuffTrigRead,
and
DMMSetTrigRead
have a
se
these functions in the Windows Command Language section (5.6) for details.
Warning! The DIN connector pins are only protected to a maximum of 30 V with respect to the chassis or
any other DMM terminal. Do not apply any voltages greater than 30 V to the DIN connector pins. Violatin
this limit may result in personal injury and/or permanent damage to the DMM.
4.11.2 Analog Threshold Trigger
This mode trigg
D
to 10 rps or higher. You can abort this mode by sending the DMM a Disarm command to the Analog Trigger.
4.11.3 Software Issued Triggered Operations
There are several software trigger functions. They cause the DMM to make a single or multiple measurements, w
Figure
4-10.
PXI Trigger input/output selection switch is located near PXI J2 connector towards the back
of the DMM.
4.11.4.1 PXI Trigger Outputs
The DMM issues a Data Ready pulse each time the A/D is done making a measurement, indicating data
is ready to be read. A short (about 140
µ
s) negative pulse is issued for each measurement, with the
positive edge indicating data is ready. The Trigger output is selected using S4, S5, and S6 DIP switch
located near the PXI connector. The trigger pulse can be set to be output to any of the following lines.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
