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- Discontinued -

OPTION #34: GATED SOCKET ASSEMBLIES

Specifications
This option is integrated directly into Products for Research Photomultiplier Socket Assemblies, and allows the user to control the on/off state of the PMT via a TTL input. The ability to gate a photomultiplier is critical in applications such as LIDAR, where the light level to be measured is significantly lower than the excitation light level. Gating can prevent saturation of the PMT, while allowing time-critical measurement of the lower light level.

The Option #34 circuits utilize optical isolation to allow switching of high voltage potentials. These circuits allow the user to gate the detector using only a TTL input and the high voltage input to the detector - there is no requirement for an additional biasing voltage input.

Option #34 is offered in two versions - the GSA-01 (detector is normally OFF), and the GSA-02 (detector is normally ON). Timing characteristics of these circuits are such that the first transition is faster than the second transition. For example, if the transition time from OFF to ON is more critical, the GSA-01 should be used. This is the appropriate circuit for most applications. Alternatively, if the transition time from ON to OFF is more critical, the GSA-02 should be used.

Additionally, there are both "pulsed" and "DC" versions of the GSA-01 and GSA-02 circuits. The pulsed version should be selected for applications requiring a pulse width of less than 1 µSec. The DC version allows the detector to be held ON or OFF indefinitely, but requires pulse widths of no shorter than approximately 1 µSec.

In order to assist the Products for Research technical assistance department in making the proper recommendations for your application, the following information is required:

  • the detector model type
  • the minimum pulsewidth (Sec) and repetition rate (Hz)
  • the more critical transition (usually OFF to ON - GSA-01)

Typical timing characteristics are listed below.




 
SPECIFICATIONS
General:
Gate Input:+5 volts, @ 20 mA
Max PMT Voltage:2500 Volts, unless otherwise specified
Dimensional Outlines:
Option 34 Socket Assembly for 2 inch [53.4 mm] Cooled Housing (5K) Option 34 Socket Assembly for 1 inch [30 mm] Cooled Housing (5K)
Option 34 in PR1400CE 2 inch [53.4 mm] Ambient Housing (8K) Option 34 in PR1401CE 1 inch [30 mm] Ambient Housing (7K)
NOTE: Specifications may vary with PMT type
GSA-01: Tube normally off, gate turns tube on
Pulse gating:
Min pulse width:2.0 µsec typ.
Max pulse width:1.0 msec
PMT output risetime:0.2 µsec typ.
PMT output falltime:1.5 µsec typ.
Delay:2.0 usec typ.
DC gating:
Max pulse width:DC
PMT output risetime:1.0 µsec typ.
PMT output falltime:1.5 msec typ.
GSA-02: Tube normally on, gate turns tube off
Pulse gating:
Min pulse width:2.0 µsec typ.
Max pulse width:1.0 msec
PMT output falltime:0.2 µsec typ.
PMT output risetime:1.5 µsec typ.
Delay:2.0 usec typ.
DC gating:
Max pulse width:DC
PMT output falltime:1.0 µsec typ.
PMT output risetime:1.5 msec typ.




PFR Closes Manufacturing

 

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