Time Controller Series User Manual
Section 5: Operating the Time Controller Hardware
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In an environment where room light must be kept to an absolute minimum, it may be useful to
switch off the LED indicators on the Time
Controller’s
front and rear panel. This can be controlled
using either:
•
the SCPI command interface (see 9.2.1
–
•
the ‘Power’ button on the device’s front panel (see
–
”).
Turn off LEDs:
To turn off the lit LED indicators on the Time
Controller’s
front and rear panels, press
the ‘Power’ button once.
Turn on LEDs:
With the Time Controller device powered on and the LED indicators un-lit, to turn the
LED indicators on press the ‘Power’ button once.
Note:
Holding
the ‘Power’ button for
2 seconds or more will cause the Time Controller to
shut down.
5.2.1
Input sampling errors
Input sampling errors,
indicated by a single flash on the input channel’s
LED indicator (see Table 6
above) may occur for the following reasons, although only ever in High Resolution mode:
•
If using an ID900 Time Controller Series device, when the average event rate on the
channel exceeds 25MHz
•
If using the ID900 Time Controller Series device, when the time between two events is
shorter than 5 ns
•
The slew rate of the signal around the threshold level is not sufficiently clean (noise-
free) and/or
steep (50 V/μs)
Note:
If the LED is still red, even though all points above are OK, the user can perform a
recalibration by clicking the "Recalibrate" button at the bottom right of the Time
Controller GUI, or by sending the command DEVIce:SAMPling:RECAlibrate. If this still does
not solve the problem, try turning off and on the device.