User Guide
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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
Typical Setup
A typical setup using a SIB164B with a Hamamatsu H12428 PMT is shown below although the example is equally
applicable to the H7546B. The device is mounted to the SIB164B and positioned to detect incoming light from a
scintillator crystal or optical assembly. Two SIB cables connect the 64 anode outputs from the SIB164B to a PhotoniQ
IQSP482 or IQSP582 64 channel PMT data acquisition system. Through a USB 2.0 connection the digitized output data
from the PhotoniQ is sent to a PC for display, logging, or real time processing. Additional connections between the
SIB164B and PhotoniQ include a high voltage cable that provides up to 1000 volts of negative bias to the H12428
cathode, and a trigger cable that supplies the trigger to the PhotoniQ from one of the SIB164B’s two discriminators. In an
alternative configuration when precision timing or coincidence detection is required, an external discriminator with
coincidence logic can be placed between the SIB164B preamplifier output and the PhotoniQ trigger input.
Figure 2: Typical Setup
High Voltage Interface
The SIB164B employs the interface circuit shown below between the high voltage input connector, J3, and the high
voltage input to the H7546B / H12428. The monitor output (HVMON) allows the high voltage cathode bias for the PMT to
be indirectly monitored at a reduced voltage level. Voltage readings at the monitor point should be scaled by a factor of
667. Calibration of the scale factor may be required.
Warning: The high voltage section of the SIB164B contains signals at voltage levels
that can exceed negative 1000 volts. Never touch a component or signal in this area.
Figure 3: PMT High Voltage Interface Circuit
