User`s manual

Lake Shore MTD Series Cryotest System User’s Manual
3-6 Installation
3.9 INSERTING A DEVICE UNDER TEST (DUT)
The MTD-150 System should be stabilized at room temperature and the transfer line removed.
1. Open the vacuum pumpout valve on cryostat to vent system.
2. Release the 4 pull-down clamps and remove the vacuum chamber end closure.
NOTE: Place vacuum chamber end closure so that the o-ring is face up to prevent damage.
3. Remove radiation shield by unscrewing the six captive socket head screws.
4. If cooled filter wheel assemblies are installed, remove each by loosening the drive shaft collett lock
hex nut and unscrewing the 3 captive screws holding the module to the filter wheel mounting
bracket. Refer to Paragraph 4.3 – Filter Wheel Assemblies.
5. Remove the chip carrier clamp assembly held in place by 4 captive socket head screws.
6. Place the DUT in the device socket on the fanout board and ensure that its contacts line up with the
socket contacts.
7. Carefully place the chip carrier clamp assembly over the DUT and check that it compresses the
DUT into the socket without binding.
8. Replace the chip carrier clamp assembly mounting screws in a 1–2–3–4 sequence to ensure
uniform clamping pressure.
CAUTION: Do not over tighten mounting screws or completely tighten one at a time. Tighten
each screw one-half turn, continuously repeating the 1–3–2–4 sequence until all
four screws are snug.
9. Replace the cooled filter wheel assemblies, if used, and tighten the 3 captive screws and the drive
shaft collett lock hex nut. Ensure that the filters/apertures are properly aligned.
10. Replace the radiation shield.
11. Clamp down the vacuum chamber end closure.
3.10 CHANGING THE FANOUT BOARD
If it is necessary to change the fanout board, the steps below should be followed:
NOTE: The MTD-150 System should be stabilized at room temperature and the transfer line removed.
1. Perform Steps 1 thru 5 from Paragraph 3.9 – Inserting A DUT.
2. Remove the fanout board retaining ring held in place by 4 phillips flat head screws.
3. The fanout board may now be removed. Care should be exercised to protect the spring finger
contacts exposed by removal of the fanout board.
NOTE: Some test set assemblies (such as the Model 1520-24D, 24-pin DIP with Zero Insertion
Force socket) have additional mounting screws that hold the cold pedestal adapter piece
in the center of the device socket. These screws must also be removed.