Ophir Optronics Ltd QSR Manuel D’Utilisation
Chapter 7 – External Triggers and Missing Pulses
Using the External Trigger in Output Mode
pyroelectric or PD10 heads, the delay is ~5us. For Broad Band (BB)
heads, the delay may be longer.
heads, the delay may be longer.
You can set the external trigger to one of two available output modes: Active
High or Active Low.
High or Active Low.
Table 7-2 External Trigger Output Modes
Input Mode
Description
Active High
• Every time a pulse arrives on the head detector the output
goes high for 10us and then returns back to low.
• The default level of the output with no pulses is low.
Active Low
• Every time a pulse arrives on the head detector the output
goes low for 10us and then returns back to high.
• The default level of the output with no pulses is high.
Enabling the Active Channel for Output Control
The External Trigger mode of the device applies to all four of the device’s
channels at once. However, in output mode only one of the channels can be
configured to drive the output at once. When the External Trigger is set for one
channel, the External Trigger for all other active channels is disabled by the
software.
channels at once. However, in output mode only one of the channels can be
configured to drive the output at once. When the External Trigger is set for one
channel, the External Trigger for all other active channels is disabled by the
software.
When first entering one of the output modes, the software automatically sets the
External Trigger to the lowest active channel, and disables the External Trigger
drop-down for all other active channels (refer to Figure 7-3). For example, if
Channels 1 and 2 are active on the Pulsar device, Channel 1’s External Trigger
drop-down is automatically set to On and the External Trigger drop-down for
channel 2 is disabled.
External Trigger to the lowest active channel, and disables the External Trigger
drop-down for all other active channels (refer to Figure 7-3). For example, if
Channels 1 and 2 are active on the Pulsar device, Channel 1’s External Trigger
drop-down is automatically set to On and the External Trigger drop-down for
channel 2 is disabled.
To enable the External Trigger Output for a different channel:
1. Select Off in the Ext. Trigger drop-down, in the Measurement Parameters
panel of whichever channel is enabled. The External Trigger drop-down
for all the channels is now active.
for all the channels is now active.
2. Set the Ext. Trigger drop-down to On for the channel you want to enable.
The channel is enabled.
StarLab User Guide
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