The dual SPAD power supply DSN 101 is an accessory for the SPCM-AQR(H) SPAD detectors of Perkin Elmer and the PDM modules from Micro Photon Devices (MPD). It controls and monitors the operation of the detectors. The DSN 101 can control two SPAD modules at the same time, displaying the count rate of one selected module.

The DSN 101 is also equipped with an automatic protection circuitry that shuts down the supply voltage to the modules safely when critical exposure levels to light are reached. While this is not a critical issue for the PDM modules, it is an absolute must for the SPCM-AQR(H) modules as indicated in the SPAD manual. In such a case the DSN 101 gives an acoustic warning.

For further diagnostics and detector adjustment there is also a BNC output for an oscilloscope or other monitoring device. The voltage at this output is proportional to the log count rate. In addition an acoustic count rate monitor output e.g. for use with speakers or earphones is provided.

The DSN 101 in its OEM version is an installation module (3U, 160 mm depth) designated to fit into a 19 inch subrack. The stand-alone version is supplied in a small table-top rack, equipped with the appropriate AC power supply.