Chapter 4. Performing Measurements
a. In the drop-down list of the Main Parameters panel, select PMT1 (Fig. 4-7).
Fig. 4-7
ļ ATTENTION! When using the PMT module, monitor level of the
PMT output (
Ext2 signal) on the oscilloscope. At level >5 V, the PMT
may be damaged.
b. Open the Auxiliary Operations Area by clicking the button at the right top of
the Main window.
c. Go to the software oscilloscope at the bottom of the Auxiliary Operations Area. In
the drop-down list of the
Signal field, select Ext2 corresponding to the PMT
output (
Fig. 4-8).
Fig. 4-8
The oscilloscope is expected to display a noisy curve with RMS level of noise of
order 0.0005. If noise is noticeably higher, check connectors between the PMT
and the controller for bad connection, test grounding of all electrical components,
and eliminate sources of strong electromagnetic interference.
d. Adjust the PMT control voltage (PMT1 parameter) by gradually increasing the
voltage until modulus of the PMT output is 1 V. Monitor the output level on the
oscilloscope.
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