Jeff, Arnaud, Betsy, Oli
Yesterday we checked the coil response for the BBSS QOSEMs. We did this at the BBSS M1 QOSEM satamp. Everything is looking good and as we expected.
We did this by putting the BBSS in SAFE, then unplugging the db15's that go to the coil drivers. In their place Jeff plugged in a fancy breakout board that separated out each of the 4 channel pins. The resistance of each of the reading device channels is listed below:
| Coil Voltage (Satamp to Coil Driver) |
Resistance of reading device
(no uncertainty to 0.1 Ohm) |
Used to measure
|
| Breakout (B/O) Channel 1 |
24.3 Ohm |
CH1 (F1), CH5 (LF) |
| Breakout (B/O) Channel 2 |
20.9 Ohm |
CH2 (F2), CH6 (RT) |
| Breakout (B/O) Channel 3 |
23.1 Ohm |
CH3 (F3) |
| Breakout (B/O) Channel 4 |
23.4 Ohm |
CH4 (SD) |
With this channel breakout board we then went channel by channel to measure voltage. We turned the master switch ON so counts can head out from the COILOUTF filter bank. For each channel, we noted the COILOUTF filter bank gain sign, and if there was any voltage read out when no offsets were put in. Then we put an OFFSET in the COILOUTF filter bank and noted the voltage that we were reading. We did this for multiple OFFSETs for each channel. After testing each channel, with an offset still on, we would check the other channels to see if anyone else was seeing anything more than their default reading with no offsets, which they never saw anything different from that. Here is that data:
| Cable |
SUS_BS_85 |
SUS_BS_87 |
| Channel |
CH1 |
CH2 |
CH3 |
CH4 |
CH5 |
CH6 |
| OSEM |
F1 |
F2 |
F3 |
SD |
LF |
RT |
| COILOUTF gain |
-1 |
-1 |
1 |
1 |
-1 |
1 |
| |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
COILOUTF OFFSET |
Voltage (V)
(+/- 0.5 mV) |
| |
20,000 |
-2.825 |
20,000 |
-2.837V |
20,000 |
2.848 |
20,000 |
2.839 |
20,000 |
-2.826 |
20,000 |
2.836 |
| |
10,000 |
-1.413 |
10,000 |
-1.419 |
10,000 |
1.424 |
10,000 |
1.419 |
10,000 |
-1.413 |
10,000 |
1.418 |
| |
0 |
0 |
0 |
-1.00E-03 |
0 |
0 |
0 |
0 |
0 |
-1.00E-03 |
0 |
0 |
| |
-10,000 |
1.412 |
-10,000 |
1.416 |
-10,000 |
-1.424 |
-10,000 |
-1.42 |
-10,000 |
1.412 |
-10,000 |
-1.418 |
| |
-20,000 |
2.825 |
-20,000 |
2.83 |
-20,000 |
-2.849 |
-20,000 |
-2.839 |
-20,000 |
2.825 |
-20,000 |
-2.837 |
| |
With OFFSET of -20,000 (in V): |
With OFFSET of -20,000 (in V): |
With OFFSET of -20,000 (in V): |
With OFFSET of -20,000 (in V): |
With OFFSET of -20,000 (in V): |
With OFFSET of -20,000 (in V): |
| |
CH1 (B/O Ch1) |
-- |
CH1 (B/O Ch1) |
0 |
CH1 (B/O Ch1) |
0 |
CH1 (B/O Ch1) |
0 |
CH5 (B/O Ch1) |
-- |
CH5 (B/O Ch1) |
-1.00E-03 |
| |
CH2 (B/O Ch2) |
-1.00E-03 |
CH2 (B/O Ch2) |
-- |
CH2 (B/O Ch2) |
-1.00E-03 |
CH2 (B/O Ch2) |
-1.00E-03 |
CH6 (B/O Ch2) |
0 |
CH6 (B/O Ch2) |
-- |
| |
CH3 (B/O Ch3) |
0 |
CH3 (B/O Ch3) |
0 |
CH3 (B/O Ch3) |
-- |
CH3 (B/O Ch3) |
0 |
|
|
|
|
| |
CH4 (B/O Ch4) |
0 |
CH4 (B/O Ch4) |
0 |
CH4 (B/O Ch4) |
0 |
CH4 (B/O Ch4) |
-- |
|
|
|
|
You can see that the voltage signs are all consistant with the sign of the OFFSET * COILOUTF gain, and the values are all pretty consistant as well.
After we were done reading out the voltages for SUS_BS_85, we put offsets of -20,000 in F1, F2, and F3 and checked the voltages on all three channels. All three channels read the same voltage as they had when we had tested them individually at -20,000 counts. That table is below.
| OFFSET of -20,000 for F1, F2, F3 (in V) |
| CH1 (F1) |
2.825 V |
| CH2 (F2) |
2.831 V |
| CH3 (F3) |
-2.849 V |
