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--- mpms-5s [2011/08/25 13:56] – tim
+++ mpms-5s [2012/02/24 11:44] (current) – boltje
@@ Line 365: / Line 365: @@
 ===== Quantum Design service notes =====
-* Connector test \\
+* ** Connector test** \\
-general test
+general test \\
 {{:equiment:squid:mpms_black_lemo.pdf|}} \\
 {{:equiment:squid:mpms_probe_resistances_all.pdf|}}
-* Flow test \\
+* **Flow test** \\
-check if cooling heating isn't fast (10K/min)
+check if cooling heating isn't fast (10K/min) \\
 {{:equiment:squid:high-power-impedance-test.mv.pdf|}}
-* Model 1802 heater/valve driver output \\
+* **Model 1802 heater/valve driver output** \\
-check if cooling heating isn't fast (10K/min)
+check if cooling heating isn't fast (10K/min) \\
 {{:equiment:squid:1014-307_output_drivers_m1802_multivu.pdf|}}
-* Model 1802 fuses \\
+* **Model 1802 fuses** \\
-check if cooling heating isn't fast (10K/min)
+check if cooling heating isn't fast (10K/min) \\
 {{:equiment:squid:1802-which_board_is_where_1.jpg‎?width=120px}}
 {{:equiment:squid:m1802_rare_panel_fuses.jpg?width=120px}}
@@ Line 385: / Line 385: @@
 {{:equiment:squid:voltages-1802-power-supply.jpg?width=120px}}
 {{:equiment:squid:voltages-1802-zoom.jpg?width=120px}}
+* **Kepco Powersupply Tests** \\
+With the following procedutre one can test the kepco PS independantly from the MPMS electronics this way we find out if the is at the electronics or at the Kepco:
+Attached bench test should help to coarsely evaluate the Kepco's ability to deliver current. Disconnect the wires from MPMS Gas/Magnet Tray to Kepco rare panel,
+connect an external power supply and wires electrically as shown in the schematic. Ramping the external power supply from 0 to 5 volts should cause adequate
+output of the Kepco voltmeter and 0-50 ampers output of the current.
+Make sure the shunt will be at least 0.1 Ohm - otherwise the test will fail and the Kepco will rail through to max current output, immediately.
+---------------
+The following info is Only for experienced users who has no possibility to send it back.
+We usually see Kepco failures with the big 70 Amp, rectifying diodes, big capacitors or the 12 2N3055 transistors.
+Your MPMS hardware manual binder should contain complete Kepco manuals that hold functional description, testing procedures, schematics and part lists for repair reference.
+{{:equiment:squid:kepco_test_circuit_1.jpg?width=120px}} {{:equiment:squid:kepco_test_circuit_2.jpg?width=120px}} {{:equiment:squid:kepco_bench_test_circuit_setup-1.pdf|}}