Two basic SIGMA handlers
are available -SIGMA 101provides ambient and elevated
temperatures to + 155 degrees Celsius and SIGMA 102 offering the
same elevated temperatures plus cold handling to - 55 degrees Celsius. A
unique two-phase (liquid and gaseous) LN2 cycle in SIGMA102A provides
the fastest possible cool-down and, because of the small contactor
volume and its location (separate from the soak chamber), better
contactor operation, fast purging and protection of critical mechanical
assemblies is assured.
RS-232 and IEEE-488
communications are built into SIGMA to provide an easy fit into your
factory automation system. Either one can operate simultaneously with
standard discrete controls. Using either the built-in display or the
selected communications, the operator is able to set or read any of the
parameters within the handler including set temperatures in any of the
zones, binning structure, soak times and many more.
straightforward design are the essence of SIGMA. Fewer moving parts
means that when jams occur (as they do in every handler),
troubleshooting is fast and spare parts requirements are kept to a
minimum. Even during cold handling, jams can be cleared and SIGMA can be
brought back on line in a matter of minutes without the typical frosting
encountered with most cold handlers.
A key component in the
SIGMA handlers, our enhanced contact set provides high speed, high
performance and long life. But most important, this long life contact
set ensures low ohmic contact while also providing forgiveness for lack
of coplanarity. Because of its unique design, it is likewise forgiving
of variations in device dimension changes. With this revolutionary
contact design, jams are a rare occurrence and, thanks to shielded
device pins which can be grounded to your DUT board, you can also cross
self-canceling characteristics of ruggedness and gentle handling are
brought together in SIGMA. Because of the simplicity of design, key
mechanisms do not require delicate sub-structures, complex interconnects
or critical alignments. The result - components are both
precision-sensitive to the delicate devices they will handle and rugged
enough to withstand the high throughput required of them.
This same design
simplicity is applied to the handling dynamics of SIGMA via the easily
adjustable gravity-flow input and output decks. The operator simply sets
the angles required to provide the optimum gentle handling as determined
by the device structure, and SIGMA does the rest.
The SIGMA family of
handlers is the most versatile available today. They are capable of
supporting device sizes in both ceramic leaded and leadless or plastic
J-leaded packages from 18 to over 100 pins. "Quik-Change" kits
allow "rededication" of SIGMA to other device types and back
again in a matter of minutes. All change kit parts simply snap into
place. This also allows the user to inexpensively re-dedicate an SMD
handler to Mil-Spec DIP capability or to start with DIPs and later
convert to SMD handling. These change kits are compatible with both hot
and cold environments.
SIGMA is a computerized,
totally menu-driven, self-diagnostic handler. Both operation and
maintenance are a one-man proposition with minimum training required.
The user friendly software behind the control/display unit in SIGMA
allows the operator or serviceman to completely follow a device through
the handling process or single-step a device at any point to verify that
all sensors and controls are operating properly. Password protection is
designed hardware features an easy-to-read CRT display, easy-to-use
control panel and a 270° swivel capability of the control/display
module to allow full accessibility from any position around the handler.
Electrical and mechanical
DUT interfacing to the SIGMA 101 and 102A is accomplished at the
backplane of the handler.
- The SIGMA family of handlers is configured to accept a wide variety of
standard docking mechanisms, manipulators, and test heads. We provide a
series of docking kits and DUT interface boards to allow easy and
convenient interfacing between the SIGMA handler and most popular test
Manifold - The use of LN2 for refrigeration in the SIGMA 102A
handler requires particular care in the interface between the
environmental zone and the ambient zone. The transfer of extreme cold
energy to a more humid warmer area will cause frost build-up which may
impair testing or affect test results.
One such interface is the
CONTACT SET/DUT BOARD interface. Thermal energy transfer through the
contact pins or through the contact set will cause frost to build up on
the outside of the contact set or on the DUT board. SIGMA provides a
flow of warm, dry N2 to this area in order to prevent such build-up. The
area of contact set/DUT board is surrounded by a defrost manifold,
creating a cavity into which N2 is fed. The slight positive pressure
created by the dry N2 prevents frost build-up.
Each SIGMA 102A is
supplied as standard with a Defrost Manifold Kit. This assembly kit,
mounted to the backplane of the handler, surrounds the Contactor Bustle
from which the contactor access pins protrude. These access pins are
used to mount DUT boards or other test system DUT electrical interfaces.
The applicable DUT board which is mounted onto the contactor either by
soldering to the pins or using alternative mounting methods fits within
the center of the Manifold or on top of the manifold (using electrically
insulating material), forming a cover for the cavity in which the
contactor sits. Nitrogen, which is burned off the soak chamber, is fed
to the manifold to provide positive pressure within this contactor/DUT
board cavity in order to purge this cavity and prevent frosting of the
contactor and DUT during cold operation.
DUT (Device Under Test)
boards are supplied unmounted and are available for numbers of device
package styles and for most popular device test systems and their test
SIGMA Quik-Change Kits
are designed to allow the SIGMA 101 or 102A to be rededicated to a
specific device size. Each Quik-Change Kit consists of 7 assemblies
which are snapped" into place without adjustments of running
surfaces or guide walls. Typical changeover time from one device size to
another by an unskilled but trained person is approximately 20 minutes.
Each Quik-Change Kit is
specific to a device size and a different kit is required whenever the
dimensions of the device change beyond the limit of the running
SMD Quik-Change Kits for
the Sigma 101 and 102A are available for a wide range of devices from 18
to 84 leads, square or rectangular, for PLCCs and LCCs. Each kit
consists of the following 7 assemblies:
- Input Deck
Allows devices to be inserted into the soak chamber.
- Input Shuttle
Moves devices from any of the 8 input tracks into the contactor
assembly for insertion into the contact set.
- Transfer Chute
- Guides the device into the contactor assembly.
- Contactor Assembly
- Positions the device for insertion into the contact set while
maintaining preset temperatures. Guides the device from the
contactor assembly (after test) toward the output assembly.
- Buffer Mechanism
- Transfers the device from the contactor assembly to the output
shuttle while maintaining "dead bug" orientation.
- Output Shuttle
- Moves devices from the buffer into one of 16 output tracks.
- Output Deck -
Devices are sorted into 1 of 16 programmable categories. Device
tubes are inserted into ends of tracks for unloading devices.
All Quik-Change Kit
running surfaces are conductive in order to eliminate ESD problems with
DIP Quik-Change Kits also
allow the SIGMA 102A to be rededicated for use as a DIP handler. These
kits allows the manufacturers and users of DIP devices who are also
considering the manufacture or use of SMD devices to prepare themselves
with a low cost solution to their present handling problems. The DIP
Change Kit consists of the same types of assemblies found in the
standard Quik-Change Kits. Conversion time from SMD to DIP handling or
back to SMD is less than 20 minutes.