... | ... | @@ -455,7 +455,7 @@ Slots 10-15: |
|
|
<td>62.53</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Wiener (slots 4-10)</td>
|
|
|
<td><span class="green">Wiener (slots 4-10)</span></td>
|
|
|
<td>Min (3600 rpm)</td>
|
|
|
<td>no</td>
|
|
|
<td>39.31</td>
|
... | ... | @@ -475,7 +475,7 @@ Slots 10-15: |
|
|
<td>61.62</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Wiener (slots 9-15)</td>
|
|
|
<td><span class="green">Wiener (slots 9-15)</span></td>
|
|
|
<td>Min (3600 rpm)</td>
|
|
|
<td>no</td>
|
|
|
<td>40.69</td>
|
... | ... | @@ -505,7 +505,7 @@ Slots 10-15: |
|
|
<td>59.88</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Elma 3U (slots 2-6)</td>
|
|
|
<td><span class="red">Elma 3U (slots 2-6)</span></td>
|
|
|
<td>Auto</td>
|
|
|
<td>no</td>
|
|
|
<td>60.12</td>
|
... | ... | @@ -515,7 +515,7 @@ Slots 10-15: |
|
|
<td>75.81</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Elma 3U (slots 2-6)</td>
|
|
|
<td><span class="red">Elma 3U (slots 2-6)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>no</td>
|
|
|
<td>52.06</td>
|
... | ... | @@ -535,7 +535,7 @@ Slots 10-15: |
|
|
<td>73.34</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Elma 3U (slots 2-5)</td>
|
|
|
<td><span class="green">Elma 3U (slots 2-5)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>no</td>
|
|
|
<td>52.06</td>
|
... | ... | @@ -555,7 +555,7 @@ Slots 10-15: |
|
|
<td>71.41</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Elma 1U</td>
|
|
|
<td><span class="green">Elma 1U</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>no</td>
|
|
|
<td>63.50</td>
|
... | ... | @@ -565,7 +565,7 @@ Slots 10-15: |
|
|
<td>65.50</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Kontron</td>
|
|
|
<td><span class="red">Kontron</span></td>
|
|
|
<td>what airflow?</td>
|
|
|
<td>no</td>
|
|
|
<td>79.50</td>
|
... | ... | @@ -575,7 +575,7 @@ Slots 10-15: |
|
|
<td>89.25</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Wiener (slots 4-9)</td>
|
|
|
<td><span class="green">Wiener (slots 4-9)</span></td>
|
|
|
<td>Min (1200 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>43.69</td>
|
... | ... | @@ -585,7 +585,7 @@ Slots 10-15: |
|
|
<td>54.84</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Wiener (slots 4-9)</td>
|
|
|
<td><span class="green">Wiener (slots 4-9)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>36.12</td>
|
... | ... | @@ -595,7 +595,7 @@ Slots 10-15: |
|
|
<td>45.81</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Wiener (slots 10-14)</td>
|
|
|
<td><span class="green">Wiener (slots 10-14)</span></td>
|
|
|
<td>Min (1200 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>43.38</td>
|
... | ... | @@ -605,7 +605,7 @@ Slots 10-15: |
|
|
<td>55.00</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Wiener (slots 10-14)</td>
|
|
|
<td><span class="green">Wiener (slots 10-14)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>35.62</td>
|
... | ... | @@ -625,7 +625,7 @@ Slots 10-15: |
|
|
<td>51.34</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Elma 6U (slots 4-9)</td>
|
|
|
<td><span class="green">Elma 6U (slots 4-9)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>36.56</td>
|
... | ... | @@ -645,7 +645,7 @@ Slots 10-15: |
|
|
<td>55.12</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Elma 6U (slots 10-14)</td>
|
|
|
<td><span class="green">Elma 6U (slots 10-14)</span></td>
|
|
|
<td>Max (3600 rpm)</td>
|
|
|
<td>yes</td>
|
|
|
<td>37.44</td>
|
... | ... | @@ -675,7 +675,7 @@ Slots 10-15: |
|
|
<td>60.41</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Elma 1U</td>
|
|
|
<td><span class="green">Elma 1U</span></td>
|
|
|
<td>Auto</td>
|
|
|
<td>yes</td>
|
|
|
<td>61.06</td>
|
... | ... | @@ -685,7 +685,7 @@ Slots 10-15: |
|
|
<td>62.84</td>
|
|
|
</tr>
|
|
|
<tr class="even">
|
|
|
<td>Elma 1U</td>
|
|
|
<td><span class="green">Elma 1U</span></td>
|
|
|
<td>Auto</td>
|
|
|
<td>yes</td>
|
|
|
<td>56.38</td>
|
... | ... | @@ -695,7 +695,7 @@ Slots 10-15: |
|
|
<td>58.50</td>
|
|
|
</tr>
|
|
|
<tr class="odd">
|
|
|
<td>Kontron</td>
|
|
|
<td><span class="red">Kontron</span></td>
|
|
|
<td>what airflow?</td>
|
|
|
<td>no</td>
|
|
|
<td>71.75</td>
|
... | ... | @@ -707,8 +707,11 @@ Slots 10-15: |
|
|
</tbody>
|
|
|
</table>
|
|
|
|
|
|
Note: the ambient temperature on the Kontron measurement is 20 degrees.
|
|
|
It is 28 degrees on the other measurements.
|
|
|
The ambient temperature on the Kontron measurement is 20 degrees. It is
|
|
|
28 degrees on the other measurements.
|
|
|
|
|
|
Configurations marked green have maximum temperature less than 65 degC.
|
|
|
Configurations marked in red exceed 80 degC.
|
|
|
|
|
|
## Replacing the LVPECL delay lines with LVDS counterparts
|
|
|
|
... | ... | @@ -728,21 +731,24 @@ than the PECL version. |
|
|
|
|
|
## Conclusions
|
|
|
|
|
|
Short version:
|
|
|
*What to do:**
|
|
|
|
|
|
- **Forced airflow is absolutely necessary**. Set the fans to the
|
|
|
maximum level in all VME installations.
|
|
|
- **Don't use heatsinks**.
|
|
|
- **Elma crates**. Set air flow to maximum level. Do not use slot 6 on
|
|
|
Elma 3U crate.
|
|
|
- **Wiener crates**. Set air flow to medium/maximum level.
|
|
|
- **Kontron PCs must be equipped with additional fan units**, to be
|
|
|
designed.
|
|
|
|
|
|
*Notes/observations:**
|
|
|
|
|
|
- **Heatsink is not effective if the air flow is too slow**. In such
|
|
|
case, the heat is exchanged through radiation with the cards in
|
|
|
immediate neighbourhood, causing collective heating of all
|
|
|
mezzanines/carriers (the ones in the middle are the worst).
|
|
|
- **Forced airflow is absolutely necessary**. Set the fans to the
|
|
|
maximum level in all VME installations.
|
|
|
- **Using an LVDS delay line chip gives little thermal advantage.**
|
|
|
- **Slot 6 in 3U Elma crates should be avoided.**
|
|
|
|
|
|
More notes:
|
|
|
|
|
|
- Cards in the middle slots (8-10) are the worst (25 degC difference
|
|
|
over slots 7 and 12). This suggests uneven air flow in the crate.
|
|
|
- FMC1 is approximately 8-10 degrees cooler than FMC2 in 3U and 1U
|
... | ... | @@ -750,8 +756,6 @@ More notes: |
|
|
obstructs air flow to FMC2.
|
|
|
- Large temperature spans in VME crates suggest uneven air flow
|
|
|
between different slots.
|
|
|
- Keeping the fans speed at a maximum (Wiener) results with reasonable
|
|
|
cooling (worst temperature: 59).
|
|
|
- On Elma 6U and Kontron PC platforms, the temperatures are
|
|
|
unacceptable and exceed the components rating (-40 ... +85).
|
|
|
- Not using slot 6 on Elma 6U, only on Kontron PC platforms, the
|
... | ... | |