Safe-To-Mate test procedure to mate an RSH flight models to the DIRENAv2 GSE By Stephan I. Böttcher $Id: RSH-DIRENA-safe-to-mate.txt,v 1.3 2008/03/06 19:46:43 bottcher Exp $ Required items: * DIRENAv2 * Power supplies: either DIRENA power supply with serial link to a GSE Computer or four lab power supplies: a) +6.5V, 800mA main DIRENA power b) +6.5V, 200mA DIRENA parport power c) +5.5V, 300mA analog +5V, low noise d) -5.5V, 100mA analog -5V, low noise c) and d) may be a common ground supply. b) must be floating with repsect to all others, it is grounded in the GSE computer parallel port. * The required power harnesses for the respective power option. * A GSE Computer with a parallel port supporting EPP mode, with the DIRENA support software installed (Linux, Python, PPdev.so, ppdirena.py, direna.rbf). Serial port for the DIRENA power supply, if it is used. * RSH to DIRENA harness(es) terminating in a female 50-pin sub-D connector. A female-female cable is provided with the DIRENA, to support the normal male sub-D50 termination of the RSH connector savers. * -70V detector bias supply, with a surge protector in the mains supply that keeps power off after a power outage. HV to banana harness. Never turn any power switch on the detector bias supply while an RSH is connected (Power bar, surge protector, NIM crate power, standby switch). Always make sure the detector bias voltage is turned down (below 2V) before mating/demating the RSH. The RSH safely allows to turn detector bias off quickly. But turning the bias on quickly will blow all FETs. * Voltmeter. Type, serial number, calibration: Setup procedure: * Observe all relevant ESD protection and cleanliness guidelines. * For lab power supplies: disconnect everything from the power supplies, switch them on, and set voltages and current limits according to the table above, switch them off. Connect the DIRENA power harnesses. Make sure that the analog and digital power harnesses are not swapped on the DIRENA. Make sure that the +5V (red banana) and the -5V (blue banana) are not swapped on the analog power supplies c) and d). Make sure both ground are connected to the black banana. Turn on the detector bias supply, turn down the voltage to less than 2V. Connect to the DIRENA banana harness (yellow banana). * For the DIRENA power supply: Make sure that the mains setting corresponds to the local mains voltage (110V/240V). Connect the respective power harnesses between the power supply and the DIRENA. Make sure they are not swapped. Connect the detector bias supply to the HV connector on the DIRENA power supply. * Connect the DIRENA parallel port interface to the GSE computer. * Switch on the DIRENA power supplies a) and b). The current on a) shall be about 100mA, the current on b) well below 100mA. * Start the DIRENA software (load ppdev.ko kernel module, setup permissions on /dev/parport0, compile PPdev.so, start ppdirena.py). * On the DIRENA-> prompt type: DIRENA-> Boot() or, on the rshgse notebooks: DIRENA-> Boot(m=1) Wait until the prompt returns. The main DIRENA power a) shall raise to a bit above 200mA. Now type: DIRENA-> pstatus() and verify that only the Fempty bit is set in the DIRENA status register. * Turn on the analog power supplies c) and d). The supply currents shall be well below 100mA. I(-5.5V) = mA _______ I(+5.5V) = mA _______ Check the RSH power pins on the DIRENA input connector. * Connect the sub-D50 female-female cable to the DIRENA input connector. * On the end of the female-female cable Check the voltages between the pins according to the following table with respect to any of the GND pins (e.g., 17 or 34): pin 26 (Vcc): +5V (+0.15V -0.2V) ------- pin 43 (Vcc): +5V (+0.15V -0.2V) == pin 26 ------- pin 41 (Vss): -5V (-0.1V +0.2V) ------- pin 42 (Vss): -5V (-0.1V +0.2V) == pin 41 ------- pin 27 (Vfet): +5V (+0.15V -0.2V) ------- pin 28 (Vfet): +5V (+0.15V -0.2V) == pin 27 ------- * Turn the detector bias voltage up slowly while watching the current display. Keep the current below 1uA to make sure there is no short. Turn up to -70V and verify the the current eventually drops to less than 5nA. * On the end of the female-female cable Check the voltages between the pins according to the following table with respect to any of the GND pins (e.g., 17 or 34): pin 44 (Vbias): -70V (+10V -1V) ------- pin 46 (Vbias): -70V (+10V -1V) == pin 44 ------- Use a high impedance voltmeter, if possible. The voltage will drop from -70V because of the load of the voltmeter. Verify that the current on the supply goes up, compare the voltage reading on the supply with the reading of the voltmeter. * Turn down the voltage on the detector bias supply. * Turn off the analog power supplies c) and d). * Turn off the DIRENA power supplies a) and b). Test with the Pathfinder * Perform PPO test on the Pathfinder, if necessary. * Connect the Pathfinder RSH to the DIRENA. * Turn on the DIRENA power supplies a) and b). Verify the currents as described above. Start DIRENA software. Check the DIRENA status register. * Turn on the analog power supplies c) and d). Verify that the supply currents are larger than those measured above without RSH attached by about 70mA on +5.5V and about 13mA on -5.5V. I(+5.5V) = mA _______ I(-5.5V) = mA _______ * Slowly. I repeat: slowly. Slowly turn up the detector bias supply voltage while watching the current. Keep the current below 1000nA, never exceed 1500nA. When the dial is at about 5.00, wait for a few seconds for the current to drop below 200nA. Switch to voltage reading. Turn up to -70V. The dial should be at about 5.70. Switch back to current reading. Verify that the current drops to below 150nA after a minute. Ibias = nA @ V after minute(s). _______ ________ ______ * Optionally: Do a cosmic muon data acquisition run. Verify that the main DIRENA supply current raises to about 500mA. Check the data for proper functioning of the DIRENA. * Turn down the detector bias below -2V. * Turn off the analog power supplies c) and d). * Disconnect the Pathfinder. Now it is safe to mate an RSH to the DIRENA input connector.