Archive : 25 September 2008 year
Keithley unveils portable battery/charger tester
21:34The Model 2308's transient output response maximises production yields by maintaining a stable voltage level under dynamic loading conditions. Its measurement engine enables accurate characterisation of both full-power operation and low-current sleep modes for quantifying power consumption.
The Model 2308 is optimised for ultra-fast test times, allowing manufacturers to lower their cost of test.
Unlike conventional power supplies, the Model 2308 features fast recovery even when load currents change by a factor of 10 or greater.
If the load pulse is too short, the conventional power supply may never return to its stable output level during the pulse.
Even with long test leads, the Model 2308 maintains a stable output voltage in response to pulse loads with a transient voltage drop of under 90mV and a transient recovery time of under 35us.
This is critical for mobile phones with pulsed-mode operation.
Maintaining a constant output voltage ensures that the device under test (DUT) does not turn off during testing and that it draws sufficient power to operate properly.
An excessive overshoot voltage transient can damage components leading to premature device failures.
The 2308 also saves test time by making fast load current measurements.
An optimised command structure minimises range changes and current measurement times for production testing.
The 2308 can change range and make a power line cycle measurement in 27ms.
With four current ranges spanning 5A to 5mA, and resolutions from 100uA to 0.1uA, test engineers can monitor small changes in load current measurements for tight quality control on production runs.
Load currents, even pulses as narrow as 50us, are measured with integrating A/D technology.
With a sampling A/D, information between samples is lost, which reduces the accuracy of the overall measurement.
In addition, the lower noise inherent in integrating A/D converters generates the most stable current readings.
In production applications, the Model 2308 employs four-wire sourcing and remote sensing for precision voltage sourcing, even when the DUT cannot be close to the power supply.
The source accuracy enables a Model 2308 channel to act as a calibration source for battery monitoring circuitry used in mobile phones and other portable devices.
With two channels packed into one half-rack instrument, one channel can simulate the battery and the other can simulate a charger.
In addition, each channel can act as a load as well as a source.
Thus, the battery channel can sink current to simulate a discharged battery so that the DUT's charger control circuit can be tested.
In addition, the Model 2308 can simulate the performance of a battery by simulating the battery's internal resistance with a programmable output resistance.
Similar to a battery, the Model 2308's output resistance can change while voltage is being sourced to simulate the increase in the battery's internal resistance as the battery discharges.
The 2308 contains two power supply channels, a DVM for voltage measurements on the DUT and digital control ports for relay control.
It is well-suited for design and test of low-power, battery-operated devices, such as 3G mobile phones, smart phones, MP3 players, Bluetooth headsets, PDAs, and portable GPS receivers.
Voltage transducer offers insulated measurements
21:32The DV transducer measures 134 x 54.22 x 147.25mm and features LEM's insulating technology. The DV has been developed and is produced according to International Railway Industry Standards (IRIS).
Engineers in the railway industry (including rolling stock and sub-stations) can use the transducer for measuring network voltages and the train's main converter DC link.
The product is also adapted for the industrial markets for high and medium voltage measurements.
With a low current consumption of 19-23mA, a large frequency bandwidth of 12kHz and safety insulation voltage of 18.5kV, the DV voltage transducer meets the demands of modern rail systems and fulfils all new EMC requirements.
Other key features include a high level of partial discharge extinction voltage, adherence to safety standards, high quality and long life.
The trend in the railway market is to save space and improve performances.
On the other hand, the latest standards make increasing requirements for higher insulation and partial discharge extinction levels in order to guarantee safety, as well as better immunity against external electrical, magnetic and electromagnetic fields for EMC protection.
The DV has been designed to meet both these conflicting demands.
The DV is Class 1 certified and materials utilised comply with the fire and smoke requirements, which are mandatory in railway applications.
The DV is CE marked and is supplied with a five-year warranty.
Datatronic releases gate drive transformer
21:28The SM580 gate drive transformer features a small surface mount package with rugged housing materials that are highly resistant to the effects of EMI. It has a typical pulse rating of 21 Vusec and features a hi-pot rating of up to 1500Vdc.
The DCR is 2.8ohm.
Turns ratios available, depending on model configuration, are: 1:1, 1:1:5 and 1:1:1.
The SM580's design combines high performance with a compact size, high temperature compatibility and economy for use in a wide range of equipment.
Datatronic said that the model offers excellent drive characteristics for power supplies in PCs, telecom gear, instrumentation, industrial controls and other electronic devices that require power supplies.
Its conductive packaging can be effective in minimising the effects of radiated EMI emissions.
The SM580 features a low-profile design that measures 4.31mm (0.170in) high with a flat top.
The package footprint is 6.60x8.38mm (0.260x0.330in) for compatibility with high-density circuit designs.
Its flat top makes the SM580 ideal for automated pick and place manufacturing.
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