STM-16

STM-16+ V2.3 16 fold Spectroscopy Amplifier with Discriminators and Multiplicity Trigger mesytec STM-16 is a shaping / timing filter amplifier with discriminator and multiplicity trigger. It is well suited for multistrip silicon detectors and for high quality spectroscopy applications. The differential input version is ideal with the preamplifier family MPR-16 / -32 / -64. Features STM-16: • 16 channel NIM module, low power design • Shaper amplifiers with baseline restorer • Timing filter amplifiers • Leading edge discriminators • Digital delay of 450 ns for timing stop • ECL timing output • Trigger output • Multiplicity trigger • Option: Remote control of discriminator thresholds and gains New Features for STM-16+: • 2 shaping times: 0.4µs / 1µs or 2µs / 5µs (= 1us/ 2us or 5us / 12us FWHM) • Gain adjustable from 1 to 600 • Unipolar Lemo input option. • Low noise: < 7µV (gain=100 and shaping time = 2µs) • Low integral nonlinearity Schematics: Differential Version Unipolar mesytec GmbH & Co. KG Wernher-von-Braun- Str. 1, D-85640 Putzbrunn, Germany fon: +49 - 89 / 456007-30 fax: +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com mesytec Technical Data: Input stage STM-16+ 16 fold shaper with timing Discriminator: • Gain adjust: gain can be set from 1 to 20 in 16 steps with factor 1.22 per step. differential version • Leading edge • Threshold: adjustable, 0 to 4 V (= 0% to 40% of maximum range) • Input connector: 34 pin male connector • Input resistance: terminated with 100 Ω, adapted to twisted pair cables. • Gain-Polarity jumper with multiplication factor of 2 and 30 are standard. (Gain range from 2 to 600) • input noise at gain = 100: 10 µVrms for 1us shaping time, 7 µVrms for 2 µs shaping time. • Common mode suppression: 50 dB • • • • Gate generator, Timing delay, ECL output unipolar version 16 Lemo 00 input connectors Input termination option: 1k and 50 Ohm, coded on the gain-polarity jumper. Gain-Polarity jumper with multiplication factor 2 and 30 are standard. Option: multiplication factor 1. input noise at gain = 100 and 2 µs shaping time = 7 µVrms. • Pulse width for trigger output: 400 ns • Timing stop- ECL-Signals: delay 400 ns from trigger, width 200 ns • Output connector: 34 pin male connector • Typical timing resolution for 5 MeV signals from silicon detector (10 * 10 mm2, 500 µm, 60V bias): dT = 400 ps. If necessary, a walk correction can be easily implemented in software using the shaper amplitude. Multiplicity trigger: Shaper: • PZ adjustable with trimmers inside the case from 8 µs to infinity. • Two shaping times of 0.4 µs / 1 µs or 2 µs / 5 µs jumper selectable, common for all channels. • • • • • • • Output amplitude: 0 to 10 V Passive baseline restorer DC-Offset: VDC ± 5 mV, common offset adjust. Output connector: 34 pin male connector Integral nonlinearity < 0.05% gain drift < 0.0075% / °C Offset drift < 50 µV/ °C • Each channel above threshold contributes to multiplicity level, a multiplicity trigger is generated for: lower multiplicity threshold ≤ multiplicity level ≤ upper multiplicity threshold • coincidence interval adjustable from 40 ns up to 150 ns (default 100 ns). • The multiplicity trigger is 100 ns delayed to the trigger signal. • Lower multiplicity threshold: 1 … 8, upper multiplicity threshold: 1 … 8 and ∞ • Multiplicity chaining: multiplicity outputs from several modules can be connected, resulting in a total multiplicity level of all connected modules. Multiplicity trigger windows of the connected modules act independently on the total multiplicity. • +6V 280 mA • -6V –680 mA • +12V 80 mA Power consumption: (max 7W) Timing filter amplifier: • RC-CR, 7 ns / 100 ns • 4 monitor outputs for timing filter signals, each providing the sum signal of 4 channels (Amplitude: -1.5 V per channel for 10 V shaper output) Remote control The modules are prepared for the remote control of 1) individual thresholds 2) gains for pairs of channels. The remote control unit is a plug in module which can also be inserted as an upgrade. mesytec GmbH & Co. KG wernher-von-braun- str. 1, 85640 putzbrunn, germany fon: +49 - 89 / 456007-30, fax : +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com 2/6 mesytec STM-16+ 16 fold shaper with timing Remote Control The STM-16 can be equipped with a remote control option which is separately available . The NIM-controller module MRC-1 is necessary as a bus master. One MRC-1 can control 32 various mesytec modules. Communication with a control PC is done via RS-232 serial interface. The discriminator thresholds can be individually adjusted from Rear side of STM-16: Coder for 16 bus addresses (0..F) Bidirectional event bus Power supply output for preamp MPR16 0..40% of the maximum range in 256 steps. The gain can be adjusted for pairs of channels in 16 steps: Timing filter sum outputs in groups of 4 channels (1-4, 5-8, 9-12, 13-16) setting 0 = gain 1, . . setting 15 = gain20, The parameters are organised in a 32 word memory array. The gain parameters are situated at the even position 0,4,8...30 (channel 1/2 .. channel 15/16) , the thresholds are situated at the odd positions 1...31 (channel 1..16) The commands are transmitted via event bus, which can be connected to the rear side of the STM-16 module. The ID-number which is set with the coder identifies the module in the bus chain and must be unique for one bus line. mesytec GmbH & Co. KG wernher-von-braun- str. 1, 85640 putzbrunn, germany fon: +49 - 89 / 456007-30, fax : +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com 3/6 mesytec STM-16+ 16 fold shaper with timing View on the PCB with servicable trimmers mesytec GmbH & Co. KG wernher-von-braun- str. 1, 85640 putzbrunn, germany fon: +49 - 89 / 456007-30, fax : +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com 4/6 mesytec STM-16+ 16 fold shaper with timing Memory List STM-16+: ADR 0 1 3 4 5 7 8 9 11 12 13 15 GAIN/THR gain 1 and 2 threshold 1 threshold 2 gain 3 and 4 threshold 3 threshold 4 gain 5 and 6 threshold 5 threshold 6 gain 7 and 8 threshold 7 threshold 8 ADR 16 17 19 20 21 23 24 25 27 28 29 31 GAIN/THR gain 9 and 10 threshold 9 threshold 10 gain 11 and 12 threshold 11 threshold 12 gain 13 and 14 threshold 13 threshold 14 gain 15 and 16 threshold 15 threshold 16 The memory positions can be written with SE command and can be read with RE command. A mirror page is available. It can be written with SM and read with RM and copied with CP. The commands RST sets all thresholds to the value 32 and all gains to the value gain = 2. The ON/OFF command makes the remote control active or inactive. The power up default is inactive. While inactive the manual values from the front panel elements are set. Identification code for STM (detected when running the scan bus command "SC") is IDC = 19 Example: reset all channels of STM-16 module ID 7 on bus 0 to defined values: RST 0 7 to set the channel 3 and 4 of module with ID 7 on bus 0 to gain = 1.5 and the threshold of channel 3 20% type: SE 0 7 4 2 //set gain of channel 3 and 4 = address 4 SE 0 7 5 128 // set threshold of channel 3 = address 5 activate remote control ON 0 7 mesytec GmbH & Co. KG wernher-von-braun- str. 1, 85640 putzbrunn, germany fon: +49 - 89 / 456007-30, fax : +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com 5/6 mesytec STM-16+ 16 fold shaper with timing Command Summary: data formats: bus dev adr gain thr = = = = = bus number [0...1] device number [0…15] parameter number [0…31] [0…15]; gain from 1 to 20 in steps of factor 1.22; [0…255]; 0..255 corresponds to threshold 0..40% maxrange Mnemonic SC bus ON bus dev OFF bus dev SE bus dev adr gain/thr RE bus dev adr RST bus dev SM bus dev adr gain/thr RM bus dev adr CP Description STM 16 allows scan bus, returns id code: IDC=19 activate RC deactivate RC set gain(even address) or threshold (odd address) read gain or threshold value reset gain and threshold to default values set mirror parameter (even address = gain, odd address = threshold) read mirror cell copy mirror to active memory mesytec GmbH & Co. KG wernher-von-braun- str. 1, 85640 putzbrunn, germany fon: +49 - 89 / 456007-30, fax : +49 - 89 / 456007-50 info@mesytec.com - www.mesytec.com 6/6