PMS-300 PMS-400 800 MHz Gated Photon Counters / Multiscalers

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Menu Bar The menu bar incorporates the following items: Main Parameters Display Start Stop StopScan Exit Under these items the following functions are available: Main: Load, Save, Convert, Print, Counter Test Parameters: Step Device Configuration, Display Parameters, Trace Parameters, EEPROM Parameters Display: Curve display with cursor and zoom functions, mathematical operations Start: Start of the measurement Stop: Stop of a measurement StopScan: Stop of the x position during the measurement of a curve Exit: Exit from the PMS software A detailed description of the menu bar functions is given in the section 'Functions of the Menu bar'. Curve Window In the curve window the measurement results are displayed. The display mode depends on the operation mode, the parameter 'points' and on the current setting of the 'Trace Parameters' and the 'Display Parameters'. In the 'Channel Rates' mode the count rates of the counter channels are displayed as bars. In the 'Multiscaler' mode curves are displayed with the specified 'Number of Points'. Normally these are the waveforms of the measured signals. However, if the step motor controller is used and configured for stepping after each curve point spectra or a spatial dependencies of the signals are obtained. During the measurement intermediate results are displayed in programmable intervals (see 'Display Control'). The number of curves displayed, the colours, the curve style and the display scale are controlled by the 'Trace Parameters' and the 'Display Parameters'. Device State 'Device State' informs about the current state of the measurement system. The 'Measurement in Progress' indicator turns on when a measurement was started. 'Repeat Time expired' indicates that the repeat time has expired before the last measurement had been finished. The 'Triggered' indicators turn on when a module was triggered. Up to four trigger indicators are displayed depending on the number of PMS modules in the system. Final results will be not displayed until all active modules have triggered and finished their measurement. Therefore, when using more than one module with trigger conditions different from 'none', make sure that all modules get an appropriate trigger pulse (see also 'Trigger Condition'). 36
Module Parameters Module / Active Under 'Module/Active' the module is selected to which the displayed module parameters refer. Parameters are displayed and set for modules only which are present in the system and declared as present in the PMS300.INI file. The modules can be switched on and off by the 'active' button. Trigger Condition 'Trigger Condition' defines the condition for the start of the measurement. With 'None' the recording starts immediately after pressing the 'Start' button of the menu bar. If 'Rising Edge' or 'Falling Edge' is selected, the measurement is initiated with the 'Start' button, but the recording does not start until the specified transition at the trigger input is recognised. A resonable accumulation of several sweeps in the Multiscaler mode is possible only if the PMS is triggered synchronously with the signal to be recorded. Therefore, the trigger condition must be ‘rising edge’ or ‘falling edge’ and an appropriate trigger signal must be used. If several PMS modules are present the trigger condition can be set independently for different modules. Each module starts its measurement by its own trigger pulse. However, final results will be not displayed until all active modules have triggered and finished their measurement. Therefore, when using several modules with trigger conditions different from 'none', make sure that all modules get an appropriate trigger pulse. Gate Level 'Gate Level' is the discriminator threshold for the gate signal. Values from -2V to +2V can be set. If no gate signal is used, a 'Gate Level' 0 for the 'Active Low' configuration has to be set to enable counting. (See section 'Gate Inputs') Trigger Threshold (PMS-400) 'Trigger Threshold' is the discriminator threshold for the trigger input of the PMS-400. Values from -2V to +2V can be set. A trigger threshold setting exists for the PMS-400 only. The PMS-300 has a TTL/CMOS trigger with a fixed threshold. Input Threshold 'Input Threshold' is the discriminator threshold of the counting input. Values from -1V to +1V can be set. The counting inputs can be configured to trigger either on the positive or on the negative edge of the input signal (See section 'Counting Inputs'). Normally, for negative detector pulses the negative edge configuration and a negative input threshold, for positive detector pulses the positive edge configuration and a positive input threshold is used. Event Threshold This parameter is used in the 'Event Mode' of the PMS only. In this mode the counter results within the specified collection time interval are compared to the specified 'Event Threshold'. If the result of one channel exceeds the specified 'Event Threshold' the results of both module channels are stored together with the time from the start of the measurement. The measurement continues until a number of events equal to the parameter 'Points' have been recorded. 37
Page 1 and 2: Becker & Hickl GmbH December 2001 P
Page 3 and 4: Stop ..............................
Page 5 and 6: Introduction Detectors for Photon C
Page 7 and 8: Photon Counting - The Logical Solut
Page 9 and 10: The PMS Module Architecture of the
Page 11 and 12: In the Multiscaler Mode several sig
Page 13 and 14: Capillary Detector Detector A Laser
Page 15 and 16: Click on ‘Download’, ‘Windows
Page 17 and 18: - PMS-400, Module not found: Module
Page 19 and 20: Building up Measurement Apparatus w
Page 21 and 22: Gate 'Low' Gate 'High' Count Input
Page 23 and 24: Simple Optical Trigger Devices Phot
Page 25 and 26: modules. However, to get maximum co
Page 27 and 28: Checking the SER of PMTs If you do
Page 29 and 30: signal shift which, in turn, result
Page 31 and 32: etween counts, see below. The struc
Page 33 and 34: output comes - via an RF filter - d
Page 35: Software The PMS Standard Software
Page 39 and 40: Repeat If 'Repeat' is set, the meas
Page 41 and 42: - The curve recording can be repeat
Page 43 and 44: Loading selected Parts of a Data Fi
Page 45 and 46: Convert The ‘Convert’ functions
Page 47 and 48: Parameters Stepping Device Configur
Page 49 and 50: Trace Parameters Up to eight indivi
Page 51 and 52: Hardware Configuration Depending on
Page 53 and 54: 2nd operand In this place the curve
Page 55 and 56: *SETUP SYS_PARA_BEGIN: #PR [PR_BASE
Page 57 and 58: Trouble Shooting Although we believ
Page 59 and 60: Tests with a Pulse Generator Test f
Page 61 and 62: The recommended PMS settings are: M
Page 63 and 64: Chaotic Results in the Multiscaler
Page 65 and 66: Assistance through bh We are please
Page 67 and 68: Specification PMS-400 Counting Inpu
Page 69 and 70: Index 2D Data Processing 52 AC coup

PMS-300 PMS-400 800 MHz Gated Photon Counters / Multiscalers

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