24. Coil: TIM 4G coil test rig - fahsuanlin/labmanual GitHub Wiki

https://github.com/fahsuanlin/labmanual/blob/master/images/coil_test_rig.jpg

1. Power

You can use any power supply that is two channel and is capable to output min 10V an up to 3-5A DC, or use two separate supplies.

2. Connection

  • Connect either of the boxes (A) or (B) using one of the two power supply cables (3) to the interconnect (2). The plugs and sockets are color- and mechanically coded and operate as a plug-turn-and-click-mechanism.

  • The second power cable (3) is used to connect the two boxes together and forward the power to the other boxes and daisy chain them together. Than connect the interconnect (2) to a Lab power supply using the power cable with the banana connectors. (1)

  • Plug in the banana connectors into the Lab power supply and tie the grounds together. Adjustments to the Lab power supply: 3.3V constant voltage (current limit with 1 box a 12Ch at 1.56A; 2 boxes chained together in series = 3.2A @ 3.3V) for the preamplifier supply. 10V supply for the PIN diode detuning (1 box a 12Ch = 1.2A; 2 boxes = 2.4A @ 10V)

  • Connect the Siemens side plugs to either of the test boxes and power up on the power supply

  • You can tune/detune each loop individually using the switches 1 to 12 (they are numbered according the Rx lines defined in the Siemens Coil Interface document).

  • In addition you can read out and program the EEPROM code of the coil using the USB socket in Test Box (A)

  • In Test Box (A) I've also included the option to pass through transmit power (Tx) if needed

Note: The 3.3V supply channel powers the preamplifiers. The maximum it should pull at 3.3V is around 1.56A, since one preamp pulls about 100-130mA, according to the specifications supplied by Siemens, and is also depending on the coil design. The output is not limited inside the text rig, so take care to connect the preamps properly inside the coil (e.g. grounding). If you supply e.g. 10V to the preamps, they'll pull less current.

The Pin diode supply to each channel is at 10V DC and is current limited with 100mA per channel inside the test box.

I tested them to the specifications defined in the Coil Interface description and checked them with a 12- and a 24-channel coil to ensure they're properly working and all channels and PIN diodes are supplied correctly. I also drop tested them from 1.5m height, so they can drop from a standard Lab bench and will still work