The 6241A/6242 handles bipolar output and is capable of ± source and ± sink operations. Therefore, it has achieved 0V sink operation which cannot be done by a general electronic load. 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 pulses of cellular phones with a minimum pulse width of 50 μs and 1 μs step.
• Capable of CV/CC operation for both charging and discharging by using HI/LO voltage limiters.
  Both HI and LO voltage limiters can be set to + value (or – value). 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 by setting a suspend voltage (Vsus). A general power supply is at 0V or in open status of 0V when output is OFF, and a low impedance state of 0V 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 6241A/6242 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.

Since the conversion efficiency of a solar cell is influenced by bias application time, measurement by pulse application is effective in finding the true conversion efficiency. By using the pulse sweep function of the 6241A/6242, the I-V curve can be measured at high speed. Furthermore, by changing the pulse width, the change in characteristics depending on the application time can be measured easily. In addition, the two slope linear sweep function that can switch the step value during measurement enables measurement from the vicinity of voltage at the peak power point to open-circuit voltage in small steps.

• Pulse measurement with a minimum pulse width of 50 μs and a minimum period of 2 ms
• Minimum voltage step: 10 μV (300 mV range)
• Two slope linear sweep
  Sweeps by Step1 between First and Middle
  Sweeps by Step2 between Middle and Last

The following shows an example of ON-resistance measurement of MOSFET. The drain side is a 4-wire ISVM circuit. The current at ON state is determined by the source current (IS), and the drain voltage at OFF state is determined by the voltage limiter (VL). The gate side inputs the SYNC OUT signal to TRIGGER IN of the 6242 on the drain side as pulse source of VSIM. In this way, synchronous measurement by two units is achieved. The results of ON-resistance measurement can be displayed in ohms. In addition, by using the linear pulse sweep function on the gate side and the fixed sweep function on the drain side, gate voltage - ON resistance characteristics can be measured easily.

• Resistance measurement range:  6241A 2 μΩ to 1.6 GΩ
                                                                      6242 0.2 μΩ to 304 MΩ
• Maximum current (IdMax):  6241A 500 mA
                                                           6242 5 A
• Pulse measurement with a minimum pulse width of 50 μs and a minimum period of 2 ms
• Gate current measurement with a resolution of 100 pA

The following shows an example of transistor DC characteristic measurement using two units. In order to perform measurement by two units of the 6241A/6242 in synchronization, SYNC OUT of one unit on the base current (Ib) side is connected to TRIGGER IN of the other unit on the collector (Vce) side. In Vce-Ic characteristic measurement, the collector current (Ic) is measured by sweeping the collector-emitter voltage (Vce) of one unit with the base current (Ib) on the other unit remaining constant. In Ib-Ic characteristic measurement, by sweeping the base current (Ib) on one unit, the collector current (Ic) is measured by the other synchronized unit.

• DC/pulse sweep function
• Maximum setting range: ± 32 V/± 500 mA (6241A)
                                                     ±6 V/±5 A (6242)
• Measurement resolution: 1 μV/100 pA
• Pulse measurement with a minimum pulse width of 50 μs and a minimum period of 2 ms
• Synchronous operation

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