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Features

• Usable time range: 5 ns to 1 ms
• 15 ranges of Time-to-Amplitude Conversion
• DC coupled for optimum count rate performance
• Built-in Single Channel Analyzer and linear gate
• COINCidence/ANTICOINCidence gating inputs
• Selectable output delay and width
• Adjustable STROBE function
• All functions on front panel

Applications

• Time of flight
• Positron lifetime
• Pulse shape analysis in particle studies
• Pulse pair timing in position-sensitive detector systems

Description

The Model 2145 Time-to-Amplitude Converter/Single Channel Analyzer generates a rectangular output pulse whose peak amplitude is linearly proportional to the time interval between a START and STOP input pulse pair. The built-in Time Single Channel Analyzer (SCA), COINCidence/ANTICOINCidence gating, RESET, STOP INHIBIT features enhance the Model 2145’s flexibility for your nuclear timing analysis needs.

The basic Time-to-Amplitude Conversion (TAC) analyzes the time relationships between random events, such as nuclear decay, that occur within a selected interval of time. The Model 2145 is ideal for time of flight, positron lifetime, pulse shape analysis in particle studies, and pulse pair timing in position-sensitive detector systems.

To meet these needs, the Model 2145 offers 15 time ranges from 20 ns to 1 ms, with a jumper-selectable time offset extending the useful range of the two shortest time ranges. The positive unipolar TAC output is essentially flat topped for accurate measurement by an analog-todigital converter (ADC).

Internal gating prevents a TAC output pulse for overrange START to STOP time differences, STOP inputs received prior to an accepted START, and START or STOP signals received during the converter busy time. The front panel OVERRANGE, VALID CONVERSION and BUSY LEDs simplify setup of the instrument. The COINCidence/ANTICOINCidence gating feature permits prompt (early) gating of a START/STOP pulse pair and is best used to minimize conversion time on unwanted pulses.

The single channel analyzer portion of the Model 2145 operates on the TAC output pulse amplitude, and places equivalent timing restriction on the time spectrum being accumulated. For a selected TIME RANGE, a 0 to 100% time window can be selected with the front panel TIME and Δ TIME ten-turn locking-dial potentiometers.