|
40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
| 40m Log |
Not logged in |
 |
|
|
 Mon Jul 7 21:36:33 2014, Jenne, rana, Update, PSL, PMC local oscillator is going wonky 
|
 Mon Jul 7 22:18:26 2014, Koji, Update, PSL, PMC local oscillator is going wonky
| |
Tue Jul 8 15:28:32 2014, Koji, Update, PSL, PMC local oscillator is going wonky
| |
Wed Jul 9 00:47:22 2014, Koji, Update, PSL, PMC local oscillator is going wonky
| |
Wed Jul 9 11:41:12 2014, Koushik, Update, PSL, PMC local oscillator is going wonky
| |
Wed Jul 9 19:53:34 2014, rana, Update, PSL, PMC LO monitor trend (5 years)
| |
Thu Jul 10 01:02:13 2014, rana, Update, PSL, more PMC science
| |
Wed Jul 9 00:59:09 2014, rana, Update, PSL, PMC local oscillator is going wonky
|
|
|
Message ID: 10172
Entry time: Thu Jul 10 01:02:13 2014
In reply to: 10167
|
| Author: |
rana |
| Type: |
Update |
| Category: |
PSL |
| Subject: |
more PMC science |
|
|
Increased gain and SNR in PMC LO monitor circuit.
- R20: 499 -> 50k Ohms (increases gain by 100)
- Used Marconi to drive the LO input and readout C1:PSL-PMC_LODET
- Fit this function and loaded it into the psl.db file. The old Kalmus way used LOGE, but I wanted to use log10, so I did. The sensor is only useful in a narrow band. Since the signal is so low at low levels, I just fit to the highest 4 points because I was too lazy to do proper weighting. Do as I say, not as I do.
Plot with data and fit attached.
** N.B.: in order to update the calibration without rebooting, I used the following command: z write C1:PSL-PMC_LOCALC.CALC "2.235*LOG(B)+12.265". This allows us to update EPICS CALC records without rebooting the IOC. |
|
|