Cornelius DPC 230 Specifications download pdf (Page 26)

20 Operating the DPC-230

Manufacturer Type Preamplifier HV / Gain CFD Thresh. Remark

bh PMC-100-20

internal 100 %

-40 mV cooled PMT module

bh PMC-100-01

internal 95%

-80 mV cooled PMT module

Hamamatsu H7422P-40

HFAC-26-2 90%

-100 mV cooled GaAsP PMT module

Hamamatsu H5773P-00, -01 HFAC-26-10 0.9V

-100 mV PMT module

Hamamatsu R3809U HFAC-26-01 -3000V -50 mV MCP PMT

1) Operated via bh DCC-100

2) DCC-100 gain setting

3) Gain control voltage

Please note that the gain of a PMTs strongly depends on its operating voltage. Moreover, the

gain of different PMTs of the same type may be different by almost an order of magnitude.

The values given in the table above are typical values. To obtain best counting efficiency and

best IRF shape, please follow the instructions given in [2].

SPADs

Although the CFD inputs are primarily designed to accept single-photon pulses from PMTs

they can also be used for recording pulses from SPAD modules. Because the SPAD modules

have internal discriminators the threshold and zero-cross setting of the CFD have negligible

influence on the counting efficiency and the instrument response width. SPAD modules hav-

ing an output for negative pulses can be connected directly to the CFD inputs; SPAD modules

with positive outputs need an A-PPI pulse inverter.

Manufacturer Type CFD Thresh. CFD Zero cross Remark

id Quantique id-100 -100 mV -20 mV use A-PPI-D pulse inverter

MPD PDM-xx-CD -100 mV -20 mV use ‘Timing’ output

Perkin Elmer SPCM-AQR -100 mV -20 mV use 10 to 20dB attenuator plus A-PPI-D

Synchronisation Pulses from Light Sources

For TCSPC operation the timing reference signal has to be connected to CFD input number

four. The input accepts pulses of negative polarity. The amplitude should be 100 mV to

500 mV; the duration can be anywhere from 300 ps to 5 ns. Thus, synchronisation signals

from the bh BHL and BHLP diode lasers can be connected directly. For the bh BDL lasers an

A-PPI-D pulse inverter is required (see Fig. 25, left). Also synchronisation signals from Tita-

nium-Sapphire lasers can usually be used. Depending on the polarity, an A-PPI-D pulse in-

verter may or not be required.

If synchronisation signals are not available from the light source, a suitable signal can usually

be generated by a bh PHD-400 photodiode module (see Fig. 25, right).

Fig. 25: Left: A-PPI-D pulse inverter. Right: PHD-400-N photodiode module

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Cornelius DPC 230 Specifications Page 26

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