Low Voltage Test for iRPC: Results and Analysis
Explore the outcomes of the low voltage test conducted for iRPC, including testing new LV systems, resistance tests, circuit diagrams, and changes in current under various conditions. Discover insights from the test with different numbers of FEBs and voltage variations.
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Low Voltage Test for iRPC Ian Crotty, Nicolas Zaganidis and Asmaa Hassan 15 November 2018
Aim & Outline Aim: Test of new LV system for iRPC. Outline: Low voltage test at 904 Low Voltage test at H2 3/18/2025 2
Low Voltage Test at 904 3/18/2025 3
Resistance Test Schematic diagram A I = 3.1 + B I = 3.6 - A (ON) I = 3.1 A A + B (ON) I = 3.1+3.6 = 6.7 A 3/18/2025 4
Resistance Test LV cable 15 m (2x2.5 mm2) 6 August 2018 V0set (V) Imon (A) DVM (PS) (V) Load (V) 5 3.11 5.70 4.99 With sense wire 5 6.70 6.53 4.99 5 5.33 5.21 3.98 Without sense wire 5 2.83 5.21 4.56 5 3.10 5.70 4.99 With sense wire 5 6.71 6.53 4.98 3/18/2025 5
Circuit Diagram with FEBs 26 September 2018 4 Cables 4 m (2 x 1.5 mm2 ) PS CAEN A3016 Sense Wire CRATE 4 FEBs CHAMBER Adaptor (50 cm) 15 m (2 x 2.5 mm2 ) 3/18/2025 6
Change in current with firmware load 26 September 2018 Vmon (Volt) Imon (A) Condition I (A) Max value during Ramp (as indicated on telnet display) 5.01 2.49 2.4 9 5.01 Stable after Ramp 2.28 2.2 5.01 Stable 2.23 5.01 Stable 2.17 3/18/2025 8
Voltage drop & Cross Sections Sense Cable 2 x 0.22 mm2 15 m FEB Cable 2 x 1.5 mm2 Power Cable PS FEBs CRATE 2 x 2.5 mm2 15 m 4 Cables Voltage drop Voltage drop V0Set I0Set Vmon Vcon Imon Trip Allows to set the output voltage Allows to set the maximum output current allows to readout the voltage on the load allows to readout the voltage on the output connector allows to readout the current value delivered by the channel Allows to set the Trip time 3/18/2025 9
Test with different No. of FEBs Volt on Multimeter at crate (volt) No. of FEBs VCon (volt) Imon (A) I (A) 0 5.112 5.11 0.02 0.46 1 5.045 5.165 0.48 0.61 2 4.964 5.235 1.09 0.53 3 4.894 5.295 1.62 0.57 Average value = 0.54 4 4.817 5.36 2.19 27 September 2018 Why is this current different between FEBs ?? Voltage drop at 15 m cable (4 FEBs) = 5.36 4.817 = 0.543 V w.r.t. the spreadsheet calculation, the voltage drop does agree (0.462 V) 3/18/2025 10
Test with different No. of FEBs Imon (A) 2.5 4 FEB 2 3 FEB 1.5 2 FEB 1 1 FEB 0.5 0 FEB 0 5.11 5.165 5.235 5.295 5.36 Vcon (volt) 3/18/2025 11
Test with Sense wire Switch on Channel Imon = 2.54 A (Ramp during Firmware (FW) load) Imon = 2.33 A (With FW loaded) At Trip Time = 0.1 S and I0set = 3 A Vmon = 4.995 V , Imon = 2.07 A , Vcon = 5.35 V Connect multimeter on Power Supply V = 5.351 V 27 September 2018 Voltage at FEB (measured value) V = 4.766 V w.r.t. the spreadsheet calculation, the voltage drop (FEB Cable) = 0.05 V, which means that the voltage at FEB (V = 5 0.05 ) V = 4.95 V doesn t agree! 3/18/2025 12
Test without Sense wire 27 September 2018 Volt on Multimeter atcrate Voltage drop (Volt) (V0set Vcon ) V0set (Volt) Imon (A) 5 4.428 0.57 2.33 5.56 5.033 0.52 2.15 Four FEBs (ON) PS adjusted to give 5 V at the crate Voltage is higher but current is lower ?? 3/18/2025 13
Check Multimeters Check DVM DT9201A against FLUKA DT 9201A 4.964 V FLUKA 4.920 V 17 October 2018 Difference is 0.044 V (OK) 3/18/2025 14
Test with A3009 Test repeated 5 times. Power supply A3009 (Max Voltage = 8 V). LV cable 30 m. 4 FEBs. 17 October 2018 DVM DVM (PS) (V) Ramp Stable V0set (V) I0set (A) Vcon (V) Imon (A) (CRATE) (V) 4.91 6.11 6.02 5 9 6 2.24 4.91 6.11 6.02 5 9 6.035 2.25 4.91 6.09 6 5 9 6.015 2.20 4.91 6.09 6 5 9 6.010 2.20 4.91 6.10 6.03 5 9 6.040 2.27 3/18/2025 15
Test with A3016 Test repeated 5 times. Power supply A3016 (Max Voltage = 8 V). LV cable 30 m. 4 FEBs. 17 October 2018 DVM DVM (PS) (V) Ramp Stable V0set (V) I0set (A) Vcon (V) Imon (A) (CRATE) (V) 4.91 6.10 6.010 5 5 6.010 2.20 4.91 6.10 6.010 5 5 6.015 2.21 4.91 6.09 5.995 5 5 5.995 2.16 4.91 6.06 5.975 5 5 5.975 2.11 4.91 6.10 6.035 5 5 6.035 2.25 3/18/2025 16
Test with A3016H Test repeated 5 times. Power supply A3016H (Max Voltage = 9 V). LV cable 30 m. 4 FEBs. 17 October 2018 DVM DVM (PS) (V) Ramp Stable V0set (V) I0set (A) Vcon (V) Imon (A) (CRATE) (V) 4.91 6.06 5.975 5 16 5.990 2.14 4.91 6.10 6.034 5 16 6.050 2.26 4.91 6.10 6.010 5 16 6.025 2.21 4.91 6.10 6.010 5 16 6.025 2.21 4.91 6.12 6.030 5 16 6.045 2.25 3/18/2025 17
Low Voltage Test at H2 3/18/2025 18
Low Voltage Test (H2) Power Supply A3016. Length of LV cable is 30 m. 5 V directly does not work unless we ramp from 3 V. 7 FEBS loaded. Measured values V = 5.01 volt , I = 3.58 A , Vcon = 6.655 V Calculated values 10 October 2018 w.r.t. the spreadsheet calculation, the voltage drop = 1.5 volt, which means that Vcon should indicate to Vcon = 6.51 V so there is agreement. http://project-cms-rpc-endcap.web.cern.ch/project-cms-rpc- endcap/rpc/UpscopeHighEta/RPCDevelopements/RE31and41/Services/LV/Cables /PowerLoss/PowerLoseLvCables5July2018.xlsx 3/18/2025 19
Low Voltage Test (H2) Power Supply A3009. Length of LV cable is 30 m. 5 V directly does not work (It gives HVMAX error). 10 October 2018 V0set (volt) Imon (A) Vcon (volt) 2 0.13 2.045 3 4.97 5.215 4 4.49 6.005 5 3.8 6.695 3/18/2025 20
Low Voltage Test (H2) Power Supply A3009. Length of LV cable is 30 m. 10 October 2018 Voltage drop (Vcon - V0set ) No. of FEBs V0set (volt) Vcon (volt) Imon (A) I (A) 7 5 6.7 1.7 3.82 0.59 6 5 6.44 1.44 3.23 0.58 5 5 6.175 1.175 2.65 0.46 4 5 5.97 0.97 2.19 0.55 3 5 5.725 0.725 1.64 0.56 2 5 5.47 0.47 1.08 0.53 Average value = 0.54 1 5 5.235 0.235 0.55 The values of current (Imon) for four FEBs agree with the values at 904. 3/18/2025 21
Low Voltage Test (H2) Imon (A) 4.5 4 7 FEB 3.5 6 FEB 3 5 FEB 2.5 4 FEB 2 3 FEB 1.5 2 FEB 1 1 FEB 0.5 0 5.235 5.47 5.725 5.97 6.175 6.44 6.7 Vcon (volt) 3/18/2025 22
Conclusion A3016 module with LV cable 15 m can power 4 FEBs without any problem. The three modules A3016 , A3016H and A3009 can power 4 FEBs with LV cable 30 m. With A3016, LV cable 30 m and 7 FEBs, 5V directly doesn t work unless we ramp from 3V. With A3009, LV cable 30 m and 7 FEBs, 5V directly doesn t work and gives HVMAX error. It works when we ramp up the module by steps: 2V, 3V, 4V and 5V but this is a dangerous option for electronics. 3/18/2025 23
Thank you! 3/18/2025 24
