AMETEK Lx Series II Programming Manual - Manual (Page 147)

Programming Manual Lx \ Ls Series II
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Note: You cannot initiate measurement triggers continuously. Otherwise, the measurement data
in the data buffer would continuously be overwritten by each triggered measurement.
6.8.10 Selecting the Measurement Trigger Source
The trigger system is waiting for a trigger signal in the Initiated state. Before you generate a
trigger, you must select a trigger source. To select the external Trigger In1 SMA as the source,
use:
TRIGger:SEQuence3:SOURce EXTernal or
TRIGger:ACQuire:SOURce EXTernal
To select IEEE-488 bus triggers (group execute trigger, device trigger, or *TRG command), use:
TRIGger:SEQuence3:SOURce BUS or
TRIGger:ACQuire:SOURce BUS
To select the signal driving the Trigger Out1 SMA connector, use:
TRIGger:SEQuence3:SOURce TTLTrg or
TRIGger:ACQuire:SOURce TTLTrg
6.8.11 Generating Measurement Triggers
Providing that you have specified the appropriate trigger source, you can generate triggers as
follows:
By sending one of the following over the IEEE-488:
TRIGger:SEQuence3:IMMediate
TRIGger:ACQuire:IMMediate
*TRG
a group execute trigger
By applying a signal with a high-to-low transition to the Trig In1 SMA connector.
By generating an output transient that causes the Trig Out1 SMA connector to output a pulse.
6.8.12 Using the DFI Output to Indicate Error Conditions
The Discrete Fault Indicator output on the rear of the Lx\Ls Series unit can be used to provide a
control or status signal to an external device. The following example illustrates the use of the DFI
output to signal a current limit fault condition.
The DFI output is the floating collector and emitter of an opto isolator. It is pulled up internally
using a pull up resistor to 5Vdc. The pull up can be removed by removing jumper W1 on the 7004-
716 range/relay board. The DFI output is active high so a logic 1 state indicates a fault condition.
The OCP detector has be to activated by sending the following command:
CURR:PROT:STATE ON
To enable the DFI circuit, send:
OUTP:DFI:SOURCE QUES