ECAL

Darkroom

Manual

by Doug Sievers

Version 1.0

June 21, 2002

Documentation Locations:\\darkroompc\E\Doug\

\\cms-db\cmsdb_G\Doug\

Table of Contents

Computer Information...... 3

Software Information...... 4

Setting Up GPIB...... 6

Instruments...... 7

Test Stand Software...... 8

Performing a Quantum Efficiency Test for an APD......

Performing a Surface Scan for an APD......

Notes on Excel Macros......

Setting up MySQL to Query the ECAL Database......

Computer Information

General:

Computer Name:darkroompc

Model:Nobilis EQ000508 415233-2

Operating System:Microsoft Windows 2000

Logon:administrator

Password:hcalproduction

Network:

IP:128.101.223.162

Subnet:255.255.252.0

Default Gateway:128.101.223.254

DNS Properties

Host Name:darkroompc

Domain:spa.umn.edu

DNS Search Order:128.101.101.101, 134.84.84.84

Domain Suffix Search Order:spa.umn.edu

WINS Properties

Primary WINS Server:128.101.220.198

Enable DNS for WINS Resolution

Hardware:

GPIB Card:National Instruments GPIB-PCI

Serial Number 7AFBE880

Relay Card:Measurement Computing CIO-RELAY08

Software Information

This section describes the various software components that must be installed to control all of the instruments and allow access to all testing and analysis functions.

National Instruments Measurement Studio v1.0

Directory:E:\MeasurementStudio

Subcomponents

NI LabWindows/CVI v5.5

After the MeasurementStudio software is installed, Service Pack 5.5 must be installed. This can be found at E:\Doug\Installs\LwCVI Patch\

NI-488.2 v1.70

This software controls the GPIB card. The MeasurementStudio installation may install an older version. Go to the control panel to find the version installed, and if necessary uninstall that version and install v1.70.

NI VISA 2.5

The MeasurementStudio installation may install an older version. Go to the control panel to find the version installed, and if necessary uninstall that version and install v2.5.

Instacal v5.13A

Directory:C:\CB\

This software controls the relay card, which manipulates the shutter control. The software may be installed directly from the supplied CD, or from a copy of the CD located at E:\Doug\Installs\ICAL513A04\. Before installation, please read the installation manual at E:\Doug\Documents\instacal_install.pdf

National Instruments LabVIEW 6.0 (OPTIONAL)

Directory:E:\Program Files\National Instruments\Labview 6\

If this software is used, it may overwrite previously installed version of NI-488.2 or NI VISA. Please ensure that the most current versions are installed. Also, be sure to read about “AccessHW,” which is required to write bytes to a hardware address for some versions of Windows. Information regarding AccessHW, as well as the installation software, is located at E:\Doug\Installs\AccessHW\

MySQL

MySQL is used to send queries to the ECAL database, which is a warehouse of all data obtained for every APD produced (to first order). To use MySQL, Microsoft Query must first be installed (if not already installed with Office 2000). Then, the MySQL ODBC driver should be installed from E:\Doug\Installs\MySQL\MyODBC-3_51_02.exe, which can also be downloaded from After that, install Data Access Objects, which is located at E:\Doug\Installs\MySQL\REDIST\DISK1\Setup.exe. To setup Excel to gain access to the ECAL database, see “Setting up MySQL to Query the ECAL Database”.

Setting Up GPIB

Before attempting to control any instruments, first check that the GPIB settings are correct. Go to the Control Panel and select GPIB. By default, the devices DEV01 – DEV16 are set to use GPIB0 addresses 1 – 16, whereas devices DEV17 – DEV32 are set to use GPIB1 addresses 1 – 16. Only GPIB0 will be installed (unless a second GPIB card is installed).

Select a device and click Configure. The value of GPIB Address: Primary should be set to the two-digit number corresponding to the device. For example, device 19 (DEVxx) should be set to Primary = 19 (xx). Set Access Board to GPIB0.

Figure 1: Setting up GPIB addresses.

Instruments

The following instruments are used.

GPIB

DEV3:Keithley 237 High Voltage Source Measure Unit

DEV4:Bertan 225-20R High Voltage Power Supply

DEV6:Keithley 485 Autoranging Picoammeter

DEV7:Keithley 7001 Switch System with (2) 7111-S QUAD 1x10 FORM C MUX

DEV8:Oriel 20050 Stepper Motor Drive controlling 77250 Grating Monochromator

Serial

COM2:Melles Griot Nanomover I

I/O Card

300h (Base Address):Measurement Computing CIO-RELAY08 Relay Board

Test Stand Software

Here

Performing a Quantum Efficiency Test for an APD

Background:

The quantum efficiency is a measure of how effectively a photon is at creating an electron-hole pair in the diode. Because higher frequency light has more energy, the quantum efficiency is not constant over the visible region of the electromagnetic spectrum. Though the APDs for CMS are designed for use at 420 nm light, we are interested in finding the quantum efficiency over the entire visible region.

Description of the test:

The quantum efficiency relies on the response of the APD, which is equal to difference in the current when light is collected and the dark current. This requires that the current be measured with the light on and off at each wavelength. When the test is run, the monochromator moves to a given wavelength, and then the dark current is read. The shutter is then opened, a short amount of time is allowed for the diode to reach steady state, and then the current is read again. The shutter then closes and the monochromator moves to the next wavelength.

Setting up the test:

  1. Write down the APD number so you don’t forget it… you will be sorry otherwise
  1. Look up the operating voltage for the APD
  2. Double-click the Excel shortcut labeled “Get VrM5025” on the desktop
  3. Enter the APD number when prompted
  4. The value is returned to the Excel spreadsheet below “VrM5025”

If the shortcut is missing from the desktop, create another shortcut from the file E:\Doug\Macro\Get_VrM5025.xls

  1. Secure the APD in the APD fixture. The APD can only be put in correctly one way, such that the leads contact the two copper grips in the fixture. Once the APD is put in the fixture, use a screwdriver to rotate the screw ¼ turn to hold the APD in place.
  1. Using a clean wipe moistened with isopropyl alcohol, gently clean the window on the APD and dry it.
  1. Mount the APD fixture on the Nanomover stage.
  2. Y
  3. O
  4. U

Performing a Surface Scan for an APD

Background:

A surface scan simply measures the response of the APD at several points on the surface of the junction. This allows the uniformity of the diode to be checked. All scans should be performed at 420 nm, unless otherwise requested.

Description of the test:

Once the diode is mounted, the Nanomover moves the APD such that the light impinges on one corner of the diode, and the current is read. The Nanomover will then move the APD to the next position, wait briefly to achieve steady state, and read the current. This repeats until the current at all positions is obtained.

Notes on Excel Macros

Setting up MySQL to Query the ECAL Database

  1. Start Microsoft Excel
  2. Go to Data>Get External Data>New Database Query…
  3. When the computer prompts “Choose Data Source” select <New Data Source>
  4. In the popup titled “Create New Data Source,” enter the following values:
  1. EcalAPD
  2. MySQL ODBC 3.51 Driver (unless a newer version is installed)
  3. Click “Connect…” and enter the following

Description:EcalAPD

Host Name:dogsbolt.hep.umn.edu

Database Name:EcalAPD

User:luser

Password:EcalRocks

Check the box labeled “Don’t prompt on connect”

Click “OK” to return to “Create New Data Source”

4.Click “OK” to return to “Choose Data Source”

  1. Click Cancel
  2. Close Microsoft Excel

1