The 6240B newly adopts the low-resistance measurement function. When there is a temperature difference between the measurement cable and the DUT, thermal EMF (voltage: Vd) will be generated. Such thermal EMF becomes a significant cause of errors in lowresistance measurement at mΩ order or less. These errors can be canceled by switching the polarity of measurement current. Former models use sample software to cancel thermal EMF in measurement, however the 6240B can cancel it without the software. Consequently, low-resistance test of connectors and low-resistance measurement of conductive materials are possible. Moreover, the 6240B is capable of high-precision contact resistance measurement that cancels thermal EMF generated on the contact surfaces of metals such as wire harness.

In I-V characteristic test on devices that generate heat when current flows, applying pulse current is effective for avoiding the influence of the self-heating. By using the current pulse sweep function and voltage measurement in synchronous with pulses, precise VF characteristic test with large current is available.

• Pulse sweep function
• Current setting range: 0 mA to ±4 A
• Voltage measurement resolution: 10 µA
• Pulse measurement with minimum pulse width of 50 µs and minimum cycle of 2 ms

The 6240B handles bipolar output and is capable of ± source and ± sink operations. Therefore, it has achieved 0 V sink operation which cannot be done by general electronic loads. With its pulse source function, it can be used for evaluation of batteries and power supply devices used for various portable devices.

• Capable of handling various pulses of cell phones with a minimum pulse width of 50 µs and 1 µs step
• Capable of CV/CC operation for both charge and discharge Both the HI and LO voltage limiters can be set to positive values (or negative values) at the same time. If HI is set to +1.8 V and LO to +1.2 V, for instance, the mode becomes constant voltage operation when the battery voltage reaches +1.8 V, and discharging terminates when it reaches +1.2 V.
• Avoids unnecessary discharge at output ON A general power supply is at 0 V or in open status of 0 V when output is OFF, and a low impedance state of 0 V always occurs when output is ON. At this time, the battery is being discharged unnecessarily for a moment. However, by setting the suspend voltage of the 6240B to +1.2 V, for instance, unnecessary discharge can be avoided since the voltage of the output terminal is +1.2 V the same as that of the battery, even in a temporary low impedance state that occurs when the output is ON. This function is also useful for preventing FET from being set to ON instantaneously at output ON when it is used as a gate voltage of J-FET or GaAsFET.

*For the detailed specifications, please download the brochure from "Download."