SIB2316 Sensor Interface Board SensL SPMArray2
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Vertilon Corporation, 66 Tadmuck Road, Westford, MA 01886
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Tel: (978) 692-7070
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Fax: (978) 692-7010
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www.vertilon.com
Setup
Jumpers & Switches
Make sure that all switches in the configuration switch, SW1, are set to on.
Power
Connect a sensor interface board cable to connector J3 on the SIB2316. Connect the other side of the cable to a
Vertilon PhotoniQ data acquisition system. Turn on the PhotoniQ and verify that the power LED, LD1, glows green.
The power LED will temporarily glow red when power is first applied. This is normal and indicates that the SIB2316
has not yet loaded configuration data. Open the SIB2316 dialog box in the PhotoniQ GUI to load the data.
Detector Bias
Select the Bias Enable in the SIB2316 dialog box to enable the bias voltage generator. Verify that the bias enable
LED, LD2, glows yellow indicating that the negative bias voltage generator is on. Use the Bias Voltage and Bias Trim
control boxes to set the detector bias voltage to the desired voltage. The bias voltage can be monitored at test points
P3 and P4.
SPMArray2 Connection
Turn off the bias to the SIB2316. Connect an SPMArray2 to channel A of the unit using an FPC cable. Connection to
the SIB2316 can be made using either the top side (J1) or bottom side (J9) FPC connector. Reapply the bias and
reconfirm that the bias voltage to the detector is correct. A second SPMArray2 device can be added in a similar way
to channel B using connectors J2 or J10.
Detector Bias Optimization
Connect the preamp output (J7) to an oscilloscope with a 50 ohm termination. With the SPMArray2 positioned in a
typical configuration in front of a particle source, adjust the detector bias so that the pulse height is about 1 volt peak.
If it is not possible to reach 1 volt peak under the maximum bias conditions, increase the gain of the preamp. Make
sure that there are no pulses that exceed 1.2 volts peak. If so, reduce the magnitude of the detector bias.
Energy Threshold
Using the SIB2316 dialog box in the PhotoniQ graphical user interface, set the trigger threshold to 5%. Verify that the
channel A coincidence LED, LD3 is blinking red. Increase the trigger threshold to the point when the LED just turns
off. Set the final trigger threshold to about 5 to 10% below this point.
Trigger Generation
When coincidence triggering is not required, a trigger signal can be generated on J6 any time the input signal crosses
the energy threshold. To disable coincidence triggering — and thus enable level triggering — set the Trigger Type in
the dialog box to Level. The output on SMB connector J6 can then be connected directly to the PhotoniQ trigger input
to trigger the data acquisition process. Each time a particle that exceeds the energy threshold is detected, the LED
will blink green and a trigger pulse will appear on J6. Note, although a trigger signal can be generated at rates
exceeding 100 KHz, the LED will only blink at a 2 Hz maximum rate. Depending on signal conditions, it may be
necessary to increase the coincidence window slightly to generate a trigger output. This is required even if
coincidence detection is not used.
Summary of Contents for SIB2316
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