MCEWiki - User contributions [en]

Connector Mating System Maintenance

2014-06-18T02:22:12Z

Halpern:

[[image:IMG_0978.JPG | 400px |thumb
| Rear view of an MDM ]]

in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.

 

[[image:IMG_0979.JPG| 400px |thumb
| Side view of an MDM, upside down. ]]

The shaft pushes or pulls the filter/connector box w.r.t. the rest of the electronics. The flex electrical connector connects to the backplane.

 

[[image:IMG_0974.JPG| 400px |thumb
| Inside view of the housing]]
Inside view of the housing showing a pair of slots for the rails per MDM and the hole for the bolt which keeps each filter/connector box from moving too far once installed.
 

[[image:IMG_0975.JPG| 400px |thumb
| Close-up of the base of a filter box ]]

This close up shows the rails and also the oval slot used to keep the filter from moving too far.

 

[[image:IMG_0976.JPG| 400px |thumb
| Assembly detail ]]

 

[[image:IMG_0952R.JPG | 400px |thumb
| Side view along the front panel ]]
showing the hex front ends of all the connector mating shafts. Notice that even when well adjusted there may be small differences in how far each shaft end protrudes.
 

[[image:IMG_0953.JPG| 400px |thumb
| Inside top view of the shafts ]]
Looking back towards the front panel from above the MCE, see that each shaft is held from moving out of the front of the box by a black steel split clamp. These clamps rest against the front inside of the MCE. The insertion force for the connectors arise in reaction from these clamps pushing on the front of the MCE top panel.

 

[[image:IMG_0954.JPG| 400px |thumb
| Inside view of shafts towards the rear. ]]

Looking out towards the cryostat, if one iwas present, from above the MCE, see a set of teflon washers and another set of black split-ring clamps. These clamps keep the shafts from moving towards the cryostat. The force to remove a connector from the cryostat arises in reaction to the force these rear rings apply to the housing. Notice also the bolts which serve ae retaining pins for the filter/connector boxes.

 

[[image:IMG_0958.JPG| 400px |thumb
| Rear split ring in compression ]]

Pressing the front panel hex heads brings the rear split ring into contact with the teflon washer and the Rear housing.

 

[[image:IMG_0959.JPG| 400px |thumb
| Rear slit ring with shaft in tension ]]

Pulling on the front of the shaft can open a small gap at the rear before the front split ring come s into tension with the front of the MCE box. A gap of 1mm or so, as seen here, is typical.

 

[[image:IMG_0960.JPG| 400px |thumb
| Step 1 in shaft removal. ]]

To remove or re-position a shaft, first loosen the rear split ring.
 

[[image:IMG_0961.JPG| 400px |thumb
| Step 1 continued ]]

..and slide it forwards.
 

[[image:IMG_0962.JPG| 400px |thumb
| Step 2 in shaft removal ]]

Then, loosen the front split ring. This might be a bit easier if you turn the shaft a few turns to allow the front ring to come away from the front wall.

Victor, who usually does this assembly and who, modestly, does not claim to do anything difficult, says this step requires a little bit of manual dexterity.
 

[[image:IMG_0963.JPG| 400px |thumb
| Step 2 Continued...]]

..and slide it towards the back.
 

[[image:IMG_0964.JPG| 400px |thumb
| Step 3 in shaft removal]]

Now you can unthread the shaft and it becomes free to move forward.
 

[[image:IMG_0965.JPG| 400px |thumb
| Step 3 , view 2. at rear of MCE ]]

Notice that the shaft threads are '''LEFT HANDED!!''' THis is to keep the sense of which way to turn the bolt to tighten the connectors. (You are actually pushing, not pulling.) Remember, the teflon washers and split rings are all still on the shaft. If you are actually removing the shaft try not to drop all the bits down into the cards.
 

[[image:IMG_0968.JPG| 400px |thumb
| View of connectors from the rear]]

See that the one of these connectors whose shaft has been partly removed, and whose split-ring clamps have been moved is not alligned with the other MDM connectors.
 

[[image:IMG_0969.JPG| 400px |thumb
| View of connectors from the rear ]]

..so align it by hand.

 

[[image:IMG_0970R.JPG| 400px |thumb
| Front panel during re-assembly ]]
Thread the shaft into the filter box until you are happy with how the shaft is positioned.
 

[[image:IMG_0971.JPG| 400px |thumb
| Sliding Clamps back home ]]
 
Slide the split ring clamps back where they belong.
[[image:IMG_0972.JPG| 400px |thumb
| Tightening the rear Split-ring clamp ]]

..and tighten them in place.

Connector Mating System Maintenance

2014-06-18T02:18:10Z

Halpern:

[[image:IMG_0978.JPG | 400px |thumb
| Rear view of an MDM ]]

in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.

 

[[image:IMG_0979.JPG| 400px |thumb
| Side view of an MDM, upside down. ]]

The shaft pushes or pulls the filter/connector box w.r.t. the rest of the electronics. The flex electrical connector connects to the backplane.

 

[[image:IMG_0974.JPG| 400px |thumb
| Inside view of the housing]]
Inside view of the housing showing a pair of slots for the rails per MDM and the hole for the bolt which keeps each filter/connector box from moving too far once installed.
 

[[image:IMG_0975.JPG| 400px |thumb
| Close-up of the base of a filter box ]]

This close up shows the rails and also the oval slot used to keep the filter from moving too far.

 

[[image:IMG_0976.JPG| 400px |thumb
| Assembly detail ]]

 

[[image:IMG_0952R.JPG | 400px |thumb
| Side view along the front panel ]]
showing the hex front ends of all the connector mating shafts. Notice that even when well adjusted there may be small differences in how far each shaft end protrudes.
 

[[image:IMG_0953.JPG| 400px |thumb
| Inside top view of the shafts ]]
Looking back towards the front panel from above the MCE, see that each shaft is held from moving out of the front of the box by a black steel split clamp. These clamps rest against the front inside of the MCE. The insertion force for the connectors arise in reaction from these clamps pushing on the front of the MCE top panel.

 

[[image:IMG_0954.JPG| 400px |thumb
| Inside view of shafts towards the rear. ]]

Looking out towards the cryostat, if one iwas present, from above the MCE, see a set of teflon washers and another set of black split-ring clamps. These clamps keep the shafts from moving towards the cryostat. The force to remove a connector from the cryostat arises in reaction to the force these rear rings apply to the housing. Notice also the bolts which serve ae retaining pins for the filter/connector boxes.

 

[[image:IMG_0958.JPG| 400px |thumb
| Rear split ring in compression ]]

Pressing the front panel hex heads brings the rear split ring into contact with the teflon washer and the Rear housing.

 

[[image:IMG_0959.JPG| 400px |thumb
| Rear slit ring with shaft in tension ]]

Pulling on the front of the shaft can open a small gap at the rear before the front split ring come s into tension with the front of the MCE box. A gap of 1mm or so, as seen here, is typical.

 

[[image:IMG_0960.JPG| 400px |thumb
| Step 1 in shaft removal. ]]

To remove or re-position a shaft, first loosen the rear split ring.
 

[[image:IMG_0961.JPG| 400px |thumb
| Step 1 continued ]]

..and slide it forwards.
 

[[image:IMG_0962.JPG| 400px |thumb
| Step 2 in shaft removal ]]

Then, loosen the front split ring. This might be a bit easier if you turn the shaft a few turns to allow the front ring to come away from the front wall.

Victor, who usually does this assembly and who, modestly, does not claim to do anything difficult, says this step requires a little bit of manual dexterity.
 

[[image:IMG_0963.JPG| 400px |thumb
| Step 2 Continued...]]

..and slide it towards the back.
 

[[image:IMG_0964.JPG| 400px |thumb
| Step 3 in shaft removal]]

Now you can unthread the shaft and it becomes free to move forward.
 

[[image:IMG_0965.JPG| 400px |thumb
| Step 3 , view 2. at rear of MCE ]]

Notice that the shaft threads are '''LEFT HANDED!!''' THis is to keep the sense of which way to turn the bolt to tighten the connectors. (You are actually pushing, not pulling.) Remember, the teflon washers and split rings are all still on the shaft. If you are actually removing the shaft try not to drop all the bits down into the cards.
 

[[image:IMG_0968.JPG| 400px |thumb
| View of connectors from the rear]]

See that the one of these connectors whose shaft has been partly removed, and whose split-ring clamps have been moved is not alligned with the other MDM connectors.
 

[[image:IMG_0969.JPG| 400px |thumb
| View of connectors from the rear ]]

..so align it by hand.

 

[[image:IMG_0970R.JPG| 400px |thumb
| ]]

 

[[image:IMG_0971.JPG| 400px |thumb
| Rear view of an MDM ]]

 

[[image:IMG_0972.JPG| 400px |thumb
| Rear view of an MDM ]]

File:IMG 0970R.JPG

2014-06-18T02:14:02Z

Halpern:

Connector Mating System Maintenance

2014-06-18T02:13:37Z

Halpern:

[[image:IMG_0978.JPG | 400px |thumb
| Rear view of an MDM ]]

in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.

 

[[image:IMG_0979.JPG| 400px |thumb
| Side view of an MDM, upside down. ]]

The shaft pushes or pulls the filter/connector box w.r.t. the rest of the electronics. The flex electrical connector connects to the backplane.

 

[[image:IMG_0974.JPG| 400px |thumb
| Inside view of the housing]]
Inside view of the housing showing a pair of slots for the rails per MDM and the hole for the bolt which keeps each filter/connector box from moving too far once installed.
 

[[image:IMG_0975.JPG| 400px |thumb
| Close-up of the base of a filter box ]]

This close up shows the rails and also the oval slot used to keep the filter from moving too far.

 

[[image:IMG_0976.JPG| 400px |thumb
| Assembly detail ]]

 

[[image:IMG_0952R.JPG | 400px |thumb
| Side view along the front panel ]]
showing the hex front ends of all the connector mating shafts. Notice that even when well adjusted there may be small differences in how far each shaft end protrudes.
 

[[image:IMG_0953.JPG| 400px |thumb
| Inside top view of the shafts ]]
Looking back towards the front panel from above the MCE, see that each shaft is held from moving out of the front of the box by a black steel split clamp. These clamps rest against the front inside of the MCE. The insertion force for the connectors arise in reaction from these clamps pushing on the front of the MCE top panel.

 

[[image:IMG_0954.JPG| 400px |thumb
| Inside view of shafts towards the rear. ]]

Looking out towards the cryostat, if one iwas present, from above the MCE, see a set of teflon washers and another set of black split-ring clamps. These clamps keep the shafts from moving towards the cryostat. The force to remove a connector from the cryostat arises in reaction to the force these rear rings apply to the housing.

 

[[image:IMG_0958.JPG| 400px |thumb
| Rear split ring in compression ]]

Pressing the front panel hex heads brings the rear split ring into contact with the teflon washer and the Rear housing.

 

[[image:IMG_0959.JPG| 400px |thumb
| Rear slit ring with shaft in tension ]]

Pulling on the front of the shaft can open a small gap at the rear before the front split ring come s into tension with the front of the MCE box. A gap of 1mm or so, as seen here, is typical.

 

[[image:IMG_0960.JPG| 400px |thumb
| Step 1 in shaft removal. ]]

To remove or re-position a shaft, first loosen the rear split ring.
 

[[image:IMG_0961.JPG| 400px |thumb
| Step 1 continued ]]

..and slide it forwards.
 

[[image:IMG_0962.JPG| 400px |thumb
| Step 2 in shaft removal ]]

Then, loosen the front split ring. This might be a bit easier if you turn the shaft a few turns to allow the front ring to come away from the front wall.

Victor, who usually does this assembly and who, modestly, does not claim to do anything difficult, says this step requires a little bit of manual dexterity.
 

[[image:IMG_0963.JPG| 400px |thumb
| Step 2 Continued...]]

..and slide it towards the back.
 

[[image:IMG_0964.JPG| 400px |thumb
| Step 3 in shaft removal]]

Now you can unthread the shaft and it becomes free to move forward.
 

[[image:IMG_0965.JPG| 400px |thumb
| Step 3 , view 2. at rear of MCE ]]

Notice that the shaft threads are '''LEFT HANDED!!''' THis is to keep the sense of which way to turn the bolt to tighten the connectors. (You are actually pushing, not pulling.) Remember, the teflon washers and split rings are all still on the shaft. If you are actually removing the shaft try not to drop all the bits down into the cards.
 

[[image:IMG_0968.JPG| 400px |thumb
| ]]

 

[[image:IMG_0969.JPG| 400px |thumb
| Rear view of an MDM ]]

 

[[image:IMG_0970R.JPG| 400px |thumb
| Rear view of an MDM ]]

 

[[image:IMG_0971.JPG| 400px |thumb
| Rear view of an MDM ]]

 

[[image:IMG_0972.JPG| 400px |thumb
| Rear view of an MDM ]]

File:IMG 0952R.JPG

2014-06-18T02:13:04Z

Halpern:

Connector Mating System Maintenance

2014-06-18T00:02:52Z

Halpern:

Connector Mating System Maintenance

2014-06-17T23:47:26Z

Halpern:

Connector Mating System Maintenance

2014-06-17T23:43:53Z

Halpern:

File:IMG 0972.JPG

2014-06-17T23:40:27Z

Halpern:

File:IMG 0971.JPG

2014-06-17T23:39:51Z

Halpern:

File:IMG 0970.JPG

2014-06-17T23:39:23Z

Halpern:

File:IMG 0969.JPG

2014-06-17T23:38:56Z

Halpern:

File:IMG 0968.JPG

2014-06-17T23:38:29Z

Halpern:

File:IMG 0965.JPG

2014-06-17T23:37:58Z

Halpern:

File:IMG 0964.JPG

2014-06-17T23:37:33Z

Halpern:

File:IMG 0963.JPG

2014-06-17T23:37:06Z

Halpern:

File:IMG 0962.JPG

2014-06-17T23:36:44Z

Halpern:

File:IMG 0961.JPG

2014-06-17T23:36:19Z

Halpern:

File:IMG 0960.JPG

2014-06-17T23:35:57Z

Halpern:

File:IMG 0959.JPG

2014-06-17T23:35:31Z

Halpern:

File:IMG 0958.JPG

2014-06-17T23:35:08Z

Halpern:

File:IMG 0954.JPG

2014-06-17T23:34:38Z

Halpern:

File:IMG 0953.JPG

2014-06-17T23:34:14Z

Halpern:

File:IMG 0952.JPG

2014-06-17T23:33:28Z

Halpern:

File:IMG 0976.JPG

2014-06-17T23:33:00Z

Halpern:

File:IMG 0975.JPG

2014-06-17T23:32:26Z

Halpern:

File:IMG 0974.JPG

2014-06-17T23:31:56Z

Halpern:

File:IMG 0979.JPG

2014-06-17T23:31:32Z

Halpern:

Connector Mating System Maintenance

2014-06-17T23:31:11Z

Halpern:

Connector Mating System Maintenance

2014-06-17T23:26:16Z

Halpern:

[[image:IMG_0978.JPG | 400px |thumb
| Rear view of an MDM ]]

in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.

 

IMG_0979.JPG
IMG_0974.JPG
IMG_0975.JPG
IMG_0976.JPG
IMG_0952.JPG
IMG_0953.JPG
IMG_0954.JPG
IMG_0958.JPG
IMG_0959.JPG
IMG_0960.JPG
IMG_0961.JPG
IMG_0962.JPG
IMG_0963.JPG
IMG_0964.JPG
IMG_0965.JPG
IMG_0968.JPG
IMG_0969.JPG
IMG_0970.JPG
IMG_0971.JPG
IMG_0972.JPG

Connector Mating System Maintenance

2014-06-17T23:25:36Z

Halpern:

[[image:IMG_0978.JPG | 500px |thumb | Rear view of an MDM ]]

in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.

 

IMG_0979.JPG
IMG_0974.JPG
IMG_0975.JPG
IMG_0976.JPG
IMG_0952.JPG
IMG_0953.JPG
IMG_0954.JPG
IMG_0958.JPG
IMG_0959.JPG
IMG_0960.JPG
IMG_0961.JPG
IMG_0962.JPG
IMG_0963.JPG
IMG_0964.JPG
IMG_0965.JPG
IMG_0968.JPG
IMG_0969.JPG
IMG_0970.JPG
IMG_0971.JPG
IMG_0972.JPG

Connector Mating System Maintenance

2014-06-17T23:23:51Z

Halpern:

[[image:IMG_0978.JPG | 500px |thumb | Rear view of an MDM in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.]]

IMG_0979.JPG
IMG_0974.JPG
IMG_0975.JPG
IMG_0976.JPG
IMG_0952.JPG
IMG_0953.JPG
IMG_0954.JPG
IMG_0958.JPG
IMG_0959.JPG
IMG_0960.JPG
IMG_0961.JPG
IMG_0962.JPG
IMG_0963.JPG
IMG_0964.JPG
IMG_0965.JPG
IMG_0968.JPG
IMG_0969.JPG
IMG_0970.JPG
IMG_0971.JPG
IMG_0972.JPG

Connector Mating System Maintenance

2014-06-17T23:23:22Z

Halpern:

[[image:IMG_0978.JPG | 600px | Rear view of an MDM in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.]]

IMG_0979.JPG
IMG_0974.JPG
IMG_0975.JPG
IMG_0976.JPG
IMG_0952.JPG
IMG_0953.JPG
IMG_0954.JPG
IMG_0958.JPG
IMG_0959.JPG
IMG_0960.JPG
IMG_0961.JPG
IMG_0962.JPG
IMG_0963.JPG
IMG_0964.JPG
IMG_0965.JPG
IMG_0968.JPG
IMG_0969.JPG
IMG_0970.JPG
IMG_0971.JPG
IMG_0972.JPG

File:IMG 0978.JPG

2014-06-17T23:22:48Z

Halpern:

Connector Mating System Maintenance

2014-06-17T23:21:32Z

Halpern: Created page with " Rear view of an MDM in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat. IMG_09…"

[[image:IMG_0978.JPG | 600px |
Rear view of an MDM in a filtered housing sitting on rails. A threaded shaft drives this connector towards or away from the cryostat.]]

IMG_0979.JPG
IMG_0974.JPG
IMG_0975.JPG
IMG_0976.JPG
IMG_0952.JPG
IMG_0953.JPG
IMG_0954.JPG
IMG_0958.JPG
IMG_0959.JPG
IMG_0960.JPG
IMG_0961.JPG
IMG_0962.JPG
IMG_0963.JPG
IMG_0964.JPG
IMG_0965.JPG
IMG_0968.JPG
IMG_0969.JPG
IMG_0970.JPG
IMG_0971.JPG
IMG_0972.JPG

Subrack

2014-06-17T23:13:18Z

Halpern: /* Other information */

{{Hierarchy header}}
Two types of MCE subracks are in production:
* a large (72-HP) subrack containing 5 MDM connectors and four read-out cards.
* a small (48-HP) subrack containing 3 MDM connectors and two read-out cards.

An intermediate sized 60-HP subrack was also prototyped but not produced in large numbers. Functionally it is equivalent to the modern 48-HP subrack.

[http://en.wikipedia.org/wiki/Horizontal_pitch (what is HP?)]

== Components ==
A fully-kitted subrack contains:
* 1 [[clock card]]
* 2 (48-HP subrack) or 4 (72-HP subrack) [[readout card]]s (fewer are installed if the extra read-out capacity is not needed)
* 3 [[bias card]]s (in some situations one might be removed)
* 1 [[address card]]

It also contains the following which are generally not "user-replaceable":
* 1 [[bus backplane]]
* 1 [[instrument backplane]]
* 3 (48-HP subrack) or 5 (72-HP subrack) MDM [[filter box]]es

;Notes:
* before the development of fast bias cards, in each subrack, one bias card was often replaced with a biasing [[address card]] ([[BAC]]), to allow for fast SQ2 switching. Modern bias cards can now perform fast switching and the BAC option is now obsolete.
* the 72-HP subrack also has space for a power supply (PSA) or a [[Linear Feed Card]] which are both obsolete and no longer installed. The [[Linear Feed Card]] would simply bring the power lines off the back plane out to front panel connectors. See [[MCE Power Requirements]] for current subrack power options.

== Dimensions and Weight ==
* A fully populated 3-MDM (5-MDM) MCE weighs approximately 9.5 kg (13 kg). This does not include the weight of the power supply and power cable.

* Dimensions for a 48-HP MCE: ~ 40cm x 31cm x 34cm (depth x width x height)
* Dimensions for a 72-HP MCE: ~ 40cm x 43cm x 34cm (depth x width x height)

** [http://www.phas.ubc.ca/~mce/mcedocs/overview/MEC-C580-111_48HP_Subrack_Mounting.pdf MCE 48-HP Mounting Dimensions (PDF)]
** [http://www.phas.ubc.ca/~mce/mcedocs/overview/MEC-C580-154_48HP_Subrack_Dimensions MCE 48-HP Dimenstions (PDF)]
** [http://www.phas.ubc.ca/~mce/mcedocs/overview/MEC-C580-197_72HP_Subrack_Mounting.pdf MCE 72-HP Mounting Dimensions (PDF)]

*Note: We are currently working on '''reducing the depth''' of the subracks by ~5cm and this will reduce the weight as well.
** [http://www.phas.ubc.ca/~mce/mcedocs/mechanical/MCE002537_ShallowSubrack(2013-8-29).zip Solidworks model for '''shallow''' MCE72 subracks (zip)]

[http://en.wikipedia.org/wiki/Horizontal_pitch (what is HP?)]

== Other information ==
* [[MCE Power Requirements]]
* [http://www.phas.ubc.ca/~mce/mcedocs/overview/SC2_ELE_S580_005_Rev4.0_mce_interfaces.pdf Hardware Interface Block Diagram(PDF)] (SC2_ELE_S580_005)
* [http://www.phas.ubc.ca/%7Emce/mcedocs/hardware/SC2_MEC-S580-504%20Subrack%20Mounting.doc Subrack Mounting Instructions (DOC)] (SC2-MEC-S580-504)
*[[Connector Mating System Maintenance]] Includes photos and description.
* [[MCE Maintenance|Hardware Maintenance notes]]
* [[MCE Cooling for balloon-based experiments]]

[[Category:Hardware]]