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Entry  Wed Mar 2 17:25:10 2022, Matias Senger, How to convert samples to volt? 
    Reply  Thu Mar 3 13:47:26 2022, Stefan Ritt, How to convert samples to volt? 
Message ID: 868     Entry time: Thu Mar 3 13:47:26 2022     In reply to: 867
Author: Stefan Ritt 
Subject: How to convert samples to volt? 

The 'drscl' tool is more for experts, normal users are advised to use the DRSOsc oscilloscope.

The board has to be calibrated for a given sampling speed before calibrated data can be read out. Do that with the "calib" command, specifying 5 for the sampling rate, 0 for the range (which is the middle between -0.5 and +0.5) and 1 for 1024 mode. If you then do "start", "stop", "read 0 1" you get calibrated data in mV.

Stefan

Matias Senger wrote:

I am using the `drscl` app. My prior experience is practically zero, sorry if this is a very naive question. When I read using `read 0 1` (channel 0, with calibration) I get this:

```
Calibration not valid for board #2946
  10    3    7    4   10    8   14    5    5    9    3    4    9    8    9    4
   3    3   12    5    5   13    3    8    1    5    0    4    8    6    6    3
...etc...
```

Why does it says that the calibration is not valid? How am I supposed to go from integers to volts?

If I run the `info` command I get this:

```
==============================
Mezz. Board index:    0
DRS type:             DRS4
Board type:           9
Serial number:        2946
Firmware revision:    30000
Temperature:          43.4 C
Input range:          -0.5V...0.5V
Calibrated range:     -0.5V...0.5V
Calibrated frequency: 0.000 GHz
Status reg.:          0000009A
Control reg.:         00000000
  DMODE circular
Trigger bus:          00000000
Frequency:            1.007 GHz
```

 

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