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PSI System Controls and Diagnostics
F3200E User Manual F3200E_UM_180726 Page 72 of 107
to get time resolved single shot data down to 1 µsec resolution by suitable setup of the sweep
mode, as described in section 16.4.
Before taking any critical time-resolved data, you should test the available maximum number of
samples under the expected worst-case loading of your network and host computer. We
recommend that you also set a maximum number of readings (the Stop Count) when using the
data buffers, to avoid arbitrary overwriting of the data.
16.2.2 PTC DiagnosticG2 buffer
The PTC DiagnosticG2 has its own circular data buffer with a maximum of 100,000 entries.
This is independent of the F3200E buffering. If you allow an acquisition to run longer than this,
and recover the log file, you will see that the data has wrapped around. The oldest entries will be
overwritten. You can clear the Diagnostic buffer at any time with the “Clear the data buffer
button”
. You can save the current buffer contents to a csv format file at any time using the
“Save the data buffer to a file” button .
16.3 External triggering
16.3.1 Custom triggering
The F3200E will respond to edges on the gate input to start, pause and stop acquisitions. Using
the Custom trigger mode allows you great flexibility in choosing when and how the F3200E
should take data, and how data taking should be synchronized with external events. Consider an
acquisition with start, pause and hold conditions.
Acquiring
Not acquiring
Start Pause Resume Pause Resume Stop
(Initiate)
or
Gate ↑ Burst count
or
Gate ↓
Gate ↑
Burst count
or
Gate ↓
Gate ↑
Stop count
or
Gate ↓ Initiate
Figure 59. Start, pause and stop conditions.
Every acquisition must start with an Initiate command from the host computer, for example
clicking the button in the PTC DiagnosticG2 program. In Internal mode, this is
sufficient on its own to start the acquisition. However to synchronize with an external event, the
start condition should be selected to respond to an incoming gate signal edge. The gate edge can
be on the Lemo 00 TTL input or the optical gate input (fiber optic channel 1 Rx).
Pausing is optional, and only possible if the start condition was set on the gate input. You can
select whether the acquisition pauses when it has reached a defined Burst Size (number of
measurements) or when it sees the opposite direction edge on the gate input to that which started