Compared to last year, channel 257 apparently is recovered (although somewhat noisy).
However, the whole group 5 / cable L (close to where the wafer is broken)
is now bad (see below), which means we have lost another 20 channels in the
northwest corner of the array.
| Channel # | Description |
|---|
| 101, 103, 106, 110 |
Strong cross-talk: 101↔106 and 103↔110. 101 and 103 may be
usable for point sources only. |
| 81, 82, 83, 84, 85, 86, 89, 90,
91, 92, 93, 94, 96, 136, 159, 160 |
Channels located in group 4 / cable M. These channels usually don't show
any astronomical signal and are considered bad.
|
| 114, 116,
117, 118, 119, 120, 126, 128, 129, 130, 131, 132, 133, 134, 141, 147,
148, 152, 153, 154, 155, 156 |
Channels located in group 5 / cable L. These channels don't show
astronomical signal (factor 20 below normal) and are considered bad.
|
| 177, 179,
180, 182, 183, 184, 185, 191, 192, 201, 202,
203, 205, 207, 217, 218, 220 |
Channels located in group 7 / cable A. These channels don't show
astronomical signal and/or cross-talk and are considered bad.
|
| 6, 45, 170, 199, 204,
206, 208, 211, 213, 219, 228, 241, 309 |
Bad channels, not showing any astronomical signal or very low signal levels,
unconnected to groups 4, 5, or 7 above. |
channel_flags-2014-03.boa:
# 25 channels not connected to any bolometer
not_connected = [ 29, 33, 35, 40, 64, 66, 124, 135, 142, 144, 146, 151,
158, 189, 193, 195, 200, 224, 226, 284, 295, 302, 304, 306,
311 ]
# 20 channels with 1MOhm resistor
resistor = [ 15, 16, 87, 88, 95, 139, 143, 145, 149, 150, 157, 178,
181, 186, 187, 188, 190, 255, 310, 317 ]
# 2 channels sealed with an absorber
blind = [ 4, 163 ]
sealed = blind
# channels showing strong cross-talk
cross = [ 101, 103, 106, 110 ]
# Bad channels (no/low signal or very high noise)
bad = [ 6, 45, 81, 82, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94,
96, 114, 116, 117, 118, 119, 120, 126, 128, 129, 130, 131, 132, 133,
134, 136, 141, 147, 148, 152, 153, 154, 155, 156, 159, 160, 170, 177,
179, 180, 182, 183, 184, 185, 191, 192, 199, 201, 202, 203, 204, 205,
206, 207, 208, 211, 213, 217, 218, 219, 220, 228, 241, 309 ]
![[Home]](https://www.apex-telescope.org/images/icon-home.gif "APEX Telescope Home Page"){kind=icon}