barcode scanner programming asp.net SOLDERING TECHNIQUES in Software

Encoder QR Code 2d barcode in Software SOLDERING TECHNIQUES

SOLDERING TECHNIQUES
Read QR Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Printing QR Code JIS X 0510 In None
Using Barcode printer for Software Control to generate, create QR Code 2d barcode image in Software applications.
Always allow the profile board and the reflow profile tracking instrument to cool to room temperature before attempting another profile check. Cooling with a fan greatly decreases the wait time. 47.3.10.3.1 Thermocouple Deployment. The size and position of the thermocouple are critical for accurate and reliable thermometry. There are many methods for securing the thermocouple bead to the PWB and some simple rules for proper thermocouple use:
QR Code Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
QR Generator In C#
Using Barcode creator for .NET Control to generate, create QR Code image in VS .NET applications.
The junction must be in contact with the object to be measured. Each of the thermocouple legs must be kept at the same temperature. There should be only one junction (the bead) between the two legs of the thermocouple. The measuring technique must not interfere with the outcome of the measurement.
QR-Code Creation In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Quick Response Code Encoder In Visual Studio .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Quick Response Code image in Visual Studio .NET applications.
47.3.10.3.2 Thermocouple Contact. The thermocouple bead must be in intimate contact with the lead and pad combination of the solder joint to be measured. Therefore, the thermocouple bead must be inserted between the device lead and the circuit board bonding pad. It is good practice to tailor the size of the thermocouple wire and, thus, the bead, for the scale of the solder joint to be measured. Flattening the thermocouple bead also helps in positioning it between lead and pad. Flattening can be accomplished with smooth-jaw pliers, a smooth-jaw vise, or a hammer.After flattening the bead, check to ensure that it is neither cracked nor broken (see Fig. 47.12).
QR Code Printer In Visual Basic .NET
Using Barcode encoder for .NET framework Control to generate, create Quick Response Code image in VS .NET applications.
UPCA Maker In None
Using Barcode generation for Software Control to generate, create Universal Product Code version A image in Software applications.
FIGURE 47.12 Checking the quality of the termocoupling: (a) A good thermocouple deployment. The bead is secured beneath a single lead and held in place with hightemperature solder. (b) The thermocouple is held in place by high-temperature solder but the solder has bridged to multiple leads. Temperature indicated will be that of the entire thermal mass of leads and solder rather than a single lead as in (a).
Generate Barcode In None
Using Barcode printer for Software Control to generate, create bar code image in Software applications.
EAN / UCC - 13 Maker In None
Using Barcode printer for Software Control to generate, create EAN128 image in Software applications.
For BGAs and other area-array devices, it is necessary to drill a very small diameter hole through the board and into the BGA ball or column. This procedure is done with a very fine drill bit slightly larger than the BGA ball.The drill bit should be kept short (slightly longer than the board plus ball thickness) to avoid breaking the bit. It helps to drill the hole location before assembly and then redrill to remove solder for thermocouple insertion after reflow. An overly hot thermal profile can be used for assembly of the thermal profile board. Drilling into the ball at that time completes the path for thermocouple insertion. As long as the hole diameter is kept small, there is no need to add solder to retain the thermocouple within the BGA. If the hole is kept slightly larger than the thermocouple bead, the radiated air temperature within the hole and around the thermocouple bead should be the same as the ball temperature. A hightemperature adhesive or heat-resistant tape should be used to anchor thermocouple leads to
Barcode Creation In None
Using Barcode generator for Software Control to generate, create barcode image in Software applications.
Making ANSI/AIM Code 128 In None
Using Barcode printer for Software Control to generate, create Code 128 Code Set C image in Software applications.
PRINTED CIRCUITS HANDBOOK
Generating MSI Plessey In None
Using Barcode printer for Software Control to generate, create MSI Plessey image in Software applications.
Code 128 Code Set C Scanner In VB.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
FIGURE 47.13 Thermocouple embedded into BGA ball. Leads are anchored to the board with a high-temperature adhesive or high-temperature tape.
GS1-128 Printer In Java
Using Barcode drawer for Eclipse BIRT Control to generate, create UCC - 12 image in BIRT applications.
Encode Bar Code In .NET
Using Barcode generation for Reporting Service Control to generate, create bar code image in Reporting Service applications.
the board to keep them in place and to prevent dislodging of the bead from its intended measurement target (see Fig. 47.13). Note that there is no need to seal the drilled hole into which thermocouple is inserted. It is a miniature blind hole largely filled with thermocouple wires.Air transfer within this hole will be negligible. 47.3.10.3.3 Thermocouple Size. Many factors can confound the solder-joint temperature measurement process, regardless of whether the thermocouple bead is properly deployed between lead and pad. Among these are the size of the bead and the thermal mass of the thermocouple assembly. In general, the use of finer-gauge thermocouples such as 30 to 36 American Wire Gauge (AWG) (see Table 47.1) is recommended. This will permit insertion between lead and pad even at very fine lead and pad pitches. Ideally the thermocouple bead will be completely within the solder joint to be measured.
EAN128 Maker In C#.NET
Using Barcode encoder for .NET Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
Make Data Matrix In Java
Using Barcode generation for Android Control to generate, create Data Matrix image in Android applications.
TABLE 47.1 AWG versus Wire Diameter and Anticipated Thermocouple Bead Diameter Wire diameter (in.) 0.032 0.020 0.010 0.005 Wire diameter (mm) 0.81 0.51 0.25 0.127 Bead diameter (in.) 0.048 0.030 0.015 0.0075 Bead diameter (mm) 1.22 0.76 0.38 0.19
Making Code 128B In Objective-C
Using Barcode maker for iPhone Control to generate, create Code 128 image in iPhone applications.
Recognize GTIN - 13 In Visual Studio .NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Copyright © OnBarcode.com . All rights reserved.