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›TSH Series (Horizontal)
›TSV Series (Vertical)
Air-to-Air
Thermal Shock Test Systems
TS Series
Horizontal Thermal Shock Chamber
TS Series
Vertical Thermal Shock Chamber
Why do Thermal Shock/Temperature Cycling?
What are your testing requirements?
MIL-STD 883H was developed primarily as a method of applying
mechanical stress to electronic components by exposing them to the
expansion and contraction of extreme temperature changes occurring over
a short period of time. This test forces packaging and circuitry weaknesses
to appear prior to shipment of the final product, thereby assuring a higher
level of quality to products in the field.
Whether you have a test requirement to meet MIL-STD or in-house
testing specification, Envirotronics’ Thermal Shock Systems are specifically
designed to meet your needs. Often MIL-STD 883H and MIL-STD 202G,
which were once used exclusively for military-grade products, are used
for commercial product testing as quality standards for all categories of
products become more stringent.
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›Air-to-Air Temperature Cycling
The evolution of MIL-STD 883H testing specification.
As quality standards become increasingly stringent, MIL-STD 883H has
evolved to provide increasingly rigorous product testing. Method 1010.8 requires
that the temperature of the test load be stabilized at the high and low temperatures
at the worst case location in the load sample. In previous testing, only the
chamber air was required to stabilize, which provided a far less stringent test for the
products being tested.
Method 1010.8 requires the temperature recovery of the worst case location
in the test load, as measures at the center and at the corner of each test load. This
requires that the test load be measured by thermocouples embedded in sample
components and that the worst case thermocouple location controls the transfer
of the product from zone to zone. In addition the, test load must reside in the
temperature chamber for a minimum of 10 minutes and must reach temperature
and transfer within 15 minutes. In order to meet these requirements, Envirotronics’
Thermal Shock systems come equipped with guaranteed soak and transfer time
controls to assure compliance with test requirements.
How is MIL-STD 883H, Method 1010.8 temperature
cycling conducted?
The test load is placed in chambers capable of providing and controlling
specified temperatures and sufficient thermal capacity and air circulation to recover
the worst case load temperature within the specified period of time.
The test load is placed so there is substantially no obstruction to the air flow
across and around it. The test load is subjected to the specified conditions for the
specified number of cycles performed continuously. Test condition C requires a
minimum of 10 cycles with a transfer time between temperature extremes of not
more than one minute. The test load is transferred when the worst case test load
temperature is within the specified limits and the time in that temperature is a
minimum of 10 minutes. However, worst case test load temperature recovery must
reach the specified limits within 15 minutes of transfer.
Table 2: Specific Heat Values
How is system capacity determined?
LOAD
SPECIFIC HEAT (BTU/LB ˚F)
Envirotronics rates the Thermal Shock system capability on MIL-STD
883H, Method 1010.8, Test Condition C, since it is the most frequent test
requirement used today. Additionally, the system’s capacity rating is based on
a test load of 16 PIN CER-DIP ICs which is the most frequent test load run by
customers. Some systems manufacturers rate their system capacity based on
a test load of aluminum or stainless steel, which changes temperature much
more easily than ceramic or plastic based products, which may not represent
the capacity needed to run your test requirements. See Table 2 for Specific
Heat values of materials, as a comparison.
Ceramic DIP ICs (CER-DIP)
Printed Circuit Boards (PCB)
Plastic DIP ICs
Aluminum
Stainless Steel
.30 to .35
.30 to .35
.30 to .40
.21
.12
Table 1: MIL-STD, Air-to Air Temperature Cycling Tests
SPECIFICATION
METHOD
TEST
TEMP RANGE ˚C
DWELL
TRANSFER
RECOVERY
MIL-STD 883H
1010.8
A
B
C
D
F
-55/ 85
-55/125
-65/150
-65/200
-65/175
10 to 15 minutes
1 minute max.
and worst case
test load temp.
recovery
Worst case test
load within
15 minutes
MIL-STD 202G
107G
A
B
C
-55/ 85
-65/125
-65/200
Per test specimen
5 minutes max.
weight chart
Upstream air
within 5 minutes
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›TS Series Thermal Shock Chambers
Vertical Thermal Shock Chambers
TWO ZONE, SINGLE CAPACITY (-2)
TWO ZONE, DOUBLE CAPACITY (-2D)
(One hot zone & one cold zone)
The products under test travel via a vertical
lift elevator, alternating between the hot
(Two hot zones & one cold zone)
In the two zone, double capacity system,
the cold zone is always in use, which
contributes to the efficiency of the system.
and cold zones.
Horizontal Thermal Shock Chambers
TWO ZONE, SINGLE CAPACITY (-2)
TWO ZONE, DOUBLE CAPACITY (-2D)
THREE ZONE, SINGLE CAPACITY (-3)
(One hot zone & one cold zone)
The products under test travel via a carrier basket,
alternating between the hot and cold zones.
(Two hot zones & one cold zone)
In the two zone, double capacity system, the cold
zone is always in use, which contributes to the
efficiency of the system.
(one cold zone, one ambient zone & one hot zone)
In the horizontal three zone, the products travel via a
carrier basket between the cold and ambient zones, and
the hot zone travels to envelop the carrier basket.
The hot zone of a TSH 3-zone chamber travels along a
track to either enclose or expose the carrier basket.
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› TS Series Horizontal Thermal Shock
› TS Series Vertical Thermal Shock
Sizes:
Sizes:
Zones:
Zones:
Temperature Range:
Temperature Range:
Liters: 55L to 760L
Cubic Feet: 2 cu. ft. to 27 cu. ft.
Liters: 19L to 760L
Cubic Feet: .5 cu. ft. to 27 cu. ft.
• Two zone, single capacity
• Two zone, double capacity
• Three zone
• Two zone, single capacity
• Two zone, double capacity
• Three zone
-73° to +180°C (Extended range up to 200°C)
Standard Features:
•Guaranteed part temperature recovery/soak monitors the worst case part thermocouple and allows transfer only when the set-point temperature has been reached.
•Thermal heat sinks in each zone for peak demand of heating and cooling.
Provides extra thermal energy to efficiently meet the MIL-STD 833H requirements.
•Supply/return air control selection switch
•Environmentally correct refrigerants are used that are ozone free and
met all current regulatory requirements.
•Safety:
• Electrically interlocking chamber doors and equipment section doors
• Electromechanical carrier lock-out
• Transfer alarm/jam alarm
• Factory set over temperature controls
• Basket automatically stops when door are opened
• Emergency Off Button (optional)
• Over temperature protection (hot zone)
• Door safety limit switches
•GN2 purge in cold zone minimizes build-up of frost on the cold zone coils,
which extends the number of cycles which can be performed between defrosting.
-73° to +180°C (Extended range up to 200°C)
Optional Features:
•Dry air purge can be used when no GN2 is available at site.
•Semi-automatic defrost system monitors the cold zone and alerts the
operators when defrosting is needed. When activated, the system goes
through a complete defrost cycle and re-starts the cold zone. Can run up
to 1,000 cycles before defrosting may be needed.
•LN2 boost/backup system to assist the mechanical cooling system where
loads exceed system ratings or where there is a shutdown of the mechanical cooling and LN2 is used for temporary operation.
•Noise reduction package provides sound insulation for the equipment
section. Can reduce sound levels to 75 dBa
•Precision over temperature and under temperature controls provide
Factory Mutual (FM) user-set control to protect the products under test.
•Air-cooled condenser available where cooling water is not accessible for
system operation.
•Remotely located equipment packages are available. Consult the
factory for configurations and specifications.
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TSH/TSV 12/2012
3881 N. Greenbrooke SE • Grand Rapids, MI USA 49512
Tel (800) 368-4768 • (616) 554-5020 Email sales@envirotronics.com
Fax (800) 791-7237 • (616) 554-5021 Web www.envirotronics.com
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