---
# System prepended metadata

title: 'TestReport for CDCFE-Fanout-Baord V0.1: <br> Measurement and Grounding issue'
tags: [DeWei, CDCFEReport]

---

# TestReport for CDCFE-Fanout-Baord V0.1: <br> Measurement and Grounding issue

## 1. 1-Vpp seems to be fine

* No chassis, No others grounding

Yellow: Input/FuncGen-ch2
Blue: Ch1-out/FanoutBaord
Red: Ch8-out/FanoutBaord

* OPA2674 @1Vpp/10MHz \<External Resistor\>
  * ![](https://i.imgur.com/IWRS7eO.png)
* OPA3692 @1Vpp/10MHz \<Fixed-Gain/IC internal Resistor\>
  * ![](https://i.imgur.com/YMvUOcH.png)
* No chassis, No others grounding


## 2. 0.1-Vpp has noise which seems to be due to bad grounding  in Lab-521: <br> building grounding (GND in 3 pole power socket)

* OPA2674 @0.1pp/10MHz
  * ![](https://i.imgur.com/gmb4bMx.png)
* OPA3692 @0.1Vpp/10MHz
  * ![](https://i.imgur.com/Yl2bp9A.png)
* OPA2674 @0.1pp/1MHz
  * ![](https://i.imgur.com/UAd46lt.png)
* OPA3692 @0.1Vpp/1MHz
  * ![](https://i.imgur.com/TZktZJ4.png)

Too bad on low voltage(0.1Vpp):(

## 3. Experiment in Lab-510: <br> Independent grounding

* OPA2674 @0.1pp/10MHz
  * ![](https://i.imgur.com/0DVxGQg.png)
* OPA3692 @0.1Vpp/10MHz
  * ![](https://i.imgur.com/4Bj97iy.png)
* OPA2674 @0.1pp/1MHz
  * ![](https://i.imgur.com/nDU0R8d.png)
* OPA3692 @0.1Vpp/1MHz
  * ![](https://i.imgur.com/6wUuiVg.png)

Good! Result is the almost same to simulation ;)

## 4. Experiment in Lab-521: <br> (empty VME)chassis grounding

![](https://i.imgur.com/VMhpvWS.png)
* OPA2674 @0.1pp/10MHz
  * ![](https://i.imgur.com/mt8yUJs.png)
* OPA3692 @0.1Vpp/10MHz
  * ![](https://i.imgur.com/D7tH45l.png)
* OPA2674 @0.1pp/1MHz
  * ![](https://i.imgur.com/MqiPFv5.png)
* OPA3692 @0.1Vpp/1MHz
  * ![](https://i.imgur.com/KNhnFwG.png)

A little improvement, 10 MHz is also bad

## 5. Experiment in Lab-521: <br> building grounding rod <br> (seems to has lots of people used in this building)

![](https://i.imgur.com/VY5dHS1.png)
* OPA2674 @0.1pp/10MHz
  * ![](https://i.imgur.com/4mHERIz.png)
* OPA3692 @0.1Vpp/10MHz
  * ![](https://i.imgur.com/rUSZ1aY.png)
* OPA2674 @0.1pp/1MHz
  * ![](https://i.imgur.com/tSC2XOj.png)
* OPA3692 @0.1Vpp/1MHz
  * ![](https://i.imgur.com/5whh2d0.png)

The Same to above (empty VME)chassis grounding

## 6. Lab521 grounding but has touched shileding chassis

* ![](https://i.imgur.com/3sTpjd5.png)
* OPA2674 @0.1Vpp/1MHz: Touch chassis
  * ![](https://i.imgur.com/6P6EnDM.png)
* OPA2674 @0.1Vpp/10MHz: Touch chassis
  * ![](https://i.imgur.com/skLzy81.png)
* OPA2674 @0.1Vpp/1MHz: General
  * ![](https://i.imgur.com/9X3SlwC.png)
* OPA2674 @0.1Vpp/10MHz: General
  * ![](https://i.imgur.com/TT9jFBE.png)

## 7. Grounding: Lab510 vs Lab521

* Connect Probe and its GND to GND
  * Touch the board and the Aluminum panel -> The same result
  * ![](https://i.imgur.com/HEDhfw7.jpg)
  * ![](https://i.imgur.com/UEixMFS.png)
* Lab510
  * ![](https://i.imgur.com/9teS3aK.png)
* Lab521
  * ![](https://i.imgur.com/rtsuJZX.png)
* t-domain (Blue-line):
  * Can't see any useful infomation
* f-domain/Spectrum (orange-line):
  * 10M/1M Hz exist noise
  * I guess that testing HF-Analog will get bad result on the lab-510
    * Antenna: B4F -> 12F???

## 8. Lab521 grounding but has cover shileding chassis

* ![](https://i.imgur.com/9HcBgej.png)
* OPA2674 @10MHz/0.1Vpp
  * ![](https://i.imgur.com/wLfzeob.png)
* OPA2674 @1MHz/0.1Vpp
  * ![](https://i.imgur.com/VtxcF1B.png)
* OPA2674 @10MHz/0.1Vpp Enlarge
  * ![](https://i.imgur.com/JczIZ13.png)
* OPA2674 @1MHz/0.1Vpp Enlarge
  * ![](https://i.imgur.com/G121Ygc.png)


###### tags: `CDCFEReport` `DeWei`