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Calibration,
maintenance, and relocation services are available for GTEM cells.
These calibration services certify a cell's performance in accordance
with the original manufacturer's specifications and instructions.
The calibration helps ensure correlation of results with any reference
open-area test site (OATS). Compliance Systems Corp.,
San Jose, CA; tel: 408-263-6486; e-mail: jramie@arctechnical.com;
Internet: http://www.compliancesys.com.
An
entry-level test system is available that will perform the four
most commonly specified electrical safety compliance tests with
a single device-under-test (DUT) connection. The system consists
of a line of hipot and ground-bond testers, which can be connected
together to perform ac hipot, dc hipot, insulation resistance, and
ground-bond tests. There are three models in the 2900 series. Model
2925 is an ac-only hipot tester, and Model 2935 is an ac and dc
hipot tester. Model 2945 is an ac and dc hipot tester with a built-in
insulation resistance tester. Model 2630 is an enhanced 30-A ground-bond
tester. Any model of the 2900 series can be interconnected with
the 2630 to form the test system. Available configurations are ac
hipot and ground bond; ac hipot, dc hipot, and ground bond; and
ac hipot, dc hipot, insulation resistance, and ground bond. Advanced
features include an LCD, multiple test memories, electronic ramp
and dwell, PLC remote control, milliohm offset and adjustable output
current, and milliohm trip current. Slaughter Company, Inc.,
Lake Forest, IL; e-mail: info@hipot.com.
A
miniature all-ceramic surface-mount trimmer capacitor offers cost-efficiency
and compact size for those applications that demand high Q and space-saving
solutions. The McQ 512 trimmer is designed for a variety of applications
that require miniature capacitance trimming, including avionics
apparatus, communications equipment, oscilloscopes, crystal oscillators,
and crystal filters. Its characteristics include high Q, tape-and-reel
feed, solder pad mount, and small footprint. Tusonix,
Tucson, AZ; tel: 520-744-0400; e-mail: sales@tusonix.com; Internet:
http://www.tusonix.com.
The
thermally conductive Tra-Bond 2153 two-part epoxy adhesive system
is designed for stacking transistors, diodes, resistors, ICs, and
other heat-sensitive components to PCBs. The adhesive develops strong,
durable, high-impact bonds at room temperature, adhering to itself
and to metals, silica, steatite, alumina, glass, plastics, sapphire,
other ceramics, and many other materials. It improves heat transfer
while maintaining electrical insulation. The epoxy meets requirements
of the NASA outgassing specification. Tra-Con Inc.,
Bedford, MA; tel: 800-872-2661; Internet: http://www.tra-con.com.
A
linear battery charger with integrated constant temperature regulation
charges both lithium-ion and nickel-metal hydride batteries and
regulates output voltage in a no-battery condition. The MAX1501
minimizes charge time, offers high reliability, and accepts regulated
or unregulated wall adapters with 4.5- to 13-V outputs. Proprietary
thermal regulation automatically adjusts the charging current to
control power dissipation when input voltage exceeds 6.5 V, and
to limit PCB temperature during constant-current, constant-voltage
charging. The thermally enhanced 16-pin, 5 X 5-mm package allows
charge current up to 1.4 A, which the user can program. Other features
include a charge-current monitor, status indicators, and automatic
restart when voltage falls below 4 V. Maxim Integrated Products,
Sunnyvale, CA; tel: 800-998-8800; Internet: http://www.maxim-ic.com.
Steady-state
and low-frequency, low-level accelerations can be measured in aerospace
and factory environments where EMI and RFI are a concern by means
of an accelerometer designed to filter and shield against such interference.
The Model 7293A Microtron accelerometer is based on anisotropically
etched variable-capacitance microsensors that can withstand shock
up to 10,000 g and high acceleration loads. Gas damping of the sensors
results in very small thermally induced changes in frequency response.
The instrument operates at 9.5 to 18.0 V dc and provides a high-level,
low-impedance ±2-V differential output that is decoupled
at a dc bias of about 3.6 V dc. Endevco, San Juan
Capistrano, CA; tel: 949-493-8181; fax: 949-661-7231; e-mail: dave@endevco.com;
Internet: http://www.endevco.com.
The
Quick Circuit 9000 rapid circuit-board prototyping system is designed
for applications requiring a large work area, including larger RF
antenna and backplane circuits, as well as traditional analog and
RF circuit boards. It features a 19 x 19-in. work area, a pneumatically
activated, speed-controlled z-axis, an enhanced Poly Depth Sensor
foot for fine milling of a variety of prototyping materials, and
full-featured IsoPro software. The chemical-free system can drill,
mill, and rout circuit-board prototypes directly from CAD/CAM data
for same-day turnaround. The software, besides facilitating automatic
data conversion from nearly any CAD package, allows for step-and-repeat
milling of several boards on a panel. T-Tech Inc.,
Norcross, GA; tel: 800-370-1530; fax: 770-455-0970; e-mail: info@t-tech.com;
Internet: http://www.t-tech.com.
A
compact, stackable benchtop chamber for product reliability testing
simulates both temperature and humidity conditions for environmental
challenges of small components, assemblies, and devices. The 1.2-cu-ft
MicroClimate chamber can provide temperatures of -73° to 190°C
and a relative humidity range of 10-98%. Standard featuresinclude
a programmable controller, RS-232 serial interface, water demineralizer
cartridge, and 2-in. access port. The easily installed chamber runs
on a standard 115-V, 15-A circuit and requires no special electrical
connections. Cincinnati Sub-Zero Products Inc.,
Cincinnati, OH; tel: 800-989-7373; e-mail: indsales @cszinc.com;
Internet: http://www.cszinc.com.
Gigabit
Ethernet data can be transmitted reliably in office networking applications
by means of a 1000Base-T transceiver adapter module. The SFP RJ-45
adapter provides a high-performance, integrated, full-duplex data
link for communication via unshielded twisted-pair Category 5 copper
cable. The device is hot pluggable and complies with the SFP industry
multisource agreement that allows 12, 24, 36, and 48-port densities.
A zinc backshell optimizes heat dissipation and EMI protection.
The adapter supports autonegotiation for full-duplex master-slave
automatic MDI crossover and pause flow control over the host serializer-deserializer
or the Category 5 interface. Molex Inc., Lisle,
IL; Internet: http://www.molex.com.
A
company's radial-lead metal oxide varistors (MOVs) provide design
engineers with a wide choice of small high-current and high-energy
transient-voltage-suppression devices. SV-series MOVs deliver a
high degree of protection in accordance with specific electrical
parameters while saving board space. Standard devices come in 5,
7, 10, 14, 20, and 23-mm sizes and a broad range of surge-current
and energy-absorption capabilities. AC operating voltages cover
60-550 V, with higher voltages offered upon request. Available with
straight or crimped leads in standard and custom designs, the varistors
can be supplied in custom configurations within available electrical
parameters. SEI Electronics Inc., Raleigh, NC;
tel: 919-850-9500; fax: 919-850-9504; e-mail: marketing@ seielect.com;
Internet: http://www.seielect.com.
A
compact complementary metal oxide semiconductor multiplexer for
keypad switches in multifunction wireless handsets and other portable
electronics enables device keys or joystick or roller pads to perform
dual functions. The 3-mm-square, 16-lead CM2500-05QF multiplexer
is offered as a space-saving substitute for a 5-Schottky-diode package.
It provides a low voltage drop of less than 10 mV from input to
output on each channel, allowing it to be used in applications where
supplies operate at 1.5-2.7 V; unlike Schottky-diode-based devices,
this multiplexer will not cause high signals to be pulled low inadvertently
when used with low-core-voltage chipsets. Separate outputs facilitate
connection to different sections of the keypad circuit for design
and PCB routing flexibility. California Micro Devices,
Milpitas, CA; tel: 800-325-4966; e-mail: sales@calmicro.com; Internet:
http://www.calmicro.com.
Precision
RF coaxial adapters for reliably connecting such test equipment
as vector network analyzers with MIL-C-39012 interfaces are available
in a full range. The 50-(omega) adapters feature a 7-mm interface
on one end and an SMA, Type N, TNC, HN, and SC on the other. They
operate from dc through 18 GHz with a maximum voltage standing-wave
ratio of 1.10, depending on the series. Offering a six-slot center
contact on the 7-mm end, the adapters have gold-plated stainless-steel
bodies and passivated stainless-steel coupling nuts, with a gold-plated
brass center contact and a Noryl insulator. They are designed to
ensure optimal electrical performance over an operating temperature
range of -55° to 85°C. TRU Corp., Peabody,
MA; tel: 800-262-9878; fax: 978-531-6993; e-mail: trusales@trucorporation.com;
Internet: http://www.trucorporation.com.
A
general-purpose LCR meter designed for applications in pass/fail
production testing, incoming inspection, quality control, and R&D,
can perform impedance measurements on resistive, capacitive, and
inductive components and materials over a wide frequency range.
The Model 1920 features programmable test frequencies of 20 Hz to
1 MHz; 20 measurement parameters, including dc resistance (DCR);
monitoring of voltage and current to the device under test; automatic
sequencing of six individual tests; and basic measurement accuracy
of 0.1%. The instrument can simultaneously measure, display, and
output test results for any two parameters, which include dissipation
factor, quality factor, and phase angle, as well as LCR and DCR.
QuadTech Inc., Maynard, MA; tel: 800-253-1230;
fax: 978-461-4295; Internet: http://www.quadtech.com.