1. ISUAL Spectrophotometer Electronics C. Ingraham

2. 2NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electronics Functions Integrate and Sample PM Tube Output Send Digitized Samples Serially to MM Create Sprite “Trigger” Signal Set Trigger Threshold Receive CDI Commands from DPU Provide Connections Among SP Subassemblies

3. 3NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electronics Block Diagram Spectrophotometer Data Controller Block Diagram (One Channel of Six) SLOW INTEGRATOR ADC FAST INTEGRATOR MUX 1-Hz Samples To Mass Memory 10-kHz Samples To Mass Memory

4. 4NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electronics Interfaces Six Buffered Analog Signals from PM Tubes Slow Serial Data to Mass Memory Fast Serial Data to Mass Memory CDI Commands from DPU Sprite Trigger to DPU, MM Six Lines to Stim LEDs Six Filter Heater and Thermistor Connections Two Survival Heater and Thermistor Connections Electronics Power from Power Controller

5. 5NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electrical (Analog) Board Mounts Between SP Left & Right Halves Mostly Connections Six PM Tube Output Preamps Six Stim LED Connections Six Filter Heater and Thermistor Connections Two Survival Heater and Thermistor Connections +/- 12 Volts Analog Power from Power Controller Filter Heater Power from Power Controller Survival Heater Power from LVPS

6. 6NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Digital Electronics (IDC) On IDC Board Integrates Charge from PMT Samples at 1 Hz and 10 kHz per Channel 12-bit A/D Converter per Channel Sends Serialized data to MM Buffers Digitally Processes Selected Channel for Sprite Trigger Adjustable Trigger Threshold

7. 7NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electronics Development Status (1) Single-Channel Test Board Built –Analog Section Tested with PMT –Digital Section Awaits FPGA SP Electrical Board Designed and Built All EEE Parts Selected, Ordered, and Received

8. 8NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electronics Development Status (2) Drawings Released: –Electrical Board Outline (8621) –Electrical Board Schematic (8623) –Electrical Board BOM (8624) –Electrical Board PCB Design (8625) –IDC PCB Schematic (8544) –SP Test Board Schematic (8646)

9. 9NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electrical Board Schematic

10. 10NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Electrical Printed Circuit Board

11. 11NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Circuits on IDC (1 of 2)

12. 12NCKU UCB Tohoku CDR 9 July, 2001 Spectrophotometer Electronics C. Ingraham SP Circuits on IDC (2 of 2)