DC Voltage Current Source/Monitor
6241A / 6242
The 6241A/6242 is a DC voltage and current source/ monitor capable of 4½-digit generation and 5½-digit measurement with high accuracy of ±0.02 %.
The instrument has two slope linear sweep, linear sweep, fixed sweep and random sweep functions, and is also capable of pulse measurement with a minimum pulse width of 50 μs and low voltage/current measurement with a resolution of 1μ V/100 pA. Thus, it can be used for a wide range of applications for evaluation in R&D of semiconductors and other electronic components, or for characteristic tests in a production line.
The sink-enabled bipolar output, the individual HI/LO limiter function and the suspend function are effective in evaluation of batteries and power ICs.
Voltage/current source and voltage/current/resistance measurement can be selected by specifying the source and measurement functions.
6241A Voltage: 0 to ± 32V
Current: 0 to ± 500mA
6242 Voltage: 0 to ± 6V
Current: 0 to ± 5A
There are four source modes; DC, pulse, DC sweep, pulse sweep. Then, the sweep modes are classified into four sweep types: fixed sweep, linear sweep, random sweep (user programmable sweep), two slope linear sweep (linear sweep with step value switching). The minimum pulse width is 50 μs. The minimum cycle is 2 ms, or 500 μs without measurement.
In voltage/current source, the HI/LO limiter settings are very important. The 6241A/6242 has a function that can set the HI and LO limiters individually. Furthermore, for the voltage-limiter, both HI and LO limiters can be set homo-polar. This prevents a capacitor or a battery from being over-discharged. Also, it is suitable for evaluating devices such as LDs that are used at a constant current and do not tolerate reverse voltage application.
The 6241A/6242 can select from three output OFF statuses; STBY (output relay OFF), HiZ (output relay ON and high resistance), and LoZ (output relay ON and low resistance). Using this function can omit unnecessary relay ON/OFF action, which reduces deterioration of the throughput due to relay operation time and improves the life span of the relay.
In addition, the setting of a suspend voltage (voltage in HiZ and LoZ status) prevents transient current sink that occurs at a connection of a voltage output device such as a battery.
When a conventional generator or electronic load is connected with a battery, the output voltage is 0V, and then the setting current starts flowing. In this case, the moment that it is connected, transient current sink occurs, causing unnecessary battery discharge. On the other hand, by setting a suspend voltage, the 6241A/6242 is connected in high-impedance state at the specified voltage and then the setting current flows. This prevents unnecessary discharge at the connection to a battery.
For the 6241A/6242, the source modes can be switched in such suspend status, which reduces deterioration of the throughput due to source mode switching
|Output OFF status||Output relay||Output status||Current limiter setting value|
|LoZ||ON||Vsus, low resistance||
VS: Setting current limiter (IL)
IS: 30 digits in the setting current range
|HiZ||ON||Vsus, high resistanc||300 nA|
Vsus: Setting suspend voltage (default: 0 V)
The typical waveform and output noise of the 6241A/6242 are shown below. The response of 0-3 V is approximately 8.5 μs at 0-90 % rising time, and the output noise is approximately 2.2 mVp-p at DC-20 MHz.
Sample hold measurement is available in the pulse mode and the pulse sweep mode. Measurement holds an input signal immediately before pulse falling edge, and A/D conversion is implemented for integration time of 100 μs. In this case, the setting measurement delay time is ignored.
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.
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.
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.
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.
|Number of digits for generation||4½|
Maximum output (top)
Minimum resolution (bottom)
±32 V/0.5 A
|±6 V/5 A|
|±0.5 A/32 V||±5 A/ 6V|
|Number of digits for measurement||5½|
|Accuracy (typical range)||0.02 %|
|Minimum measurement resolution||Voltage||1 μV|
|Maximum measurement resistnace
/ Minimum resolution
|1.6 GΩ/2 μΩ||304 MΩ/0.2 μΩ|
|Pulse application / Measurement||Available|
|Minimum pulse width||50 μs|
*For the detailed specifications, please download the brochure from "Download."
|Input cable (banana (4 pins) - Kelvin)||A01006|
|BNC-BNC cable (1.5 m)|
|Input cable (test probe)||A01041|
|Input and output cable (safety plug)||A01044|
|Input and output cable (large current 0.5 m)||A01047-01|
|Input and output cable (large current 1 m)||A01047-02|
|Input and output cable (large current 1.5 m)||A01047-03|
|Input and output cable (large current 2 m)|
|Banana tip adapter (for A01044)||A08531|
|Alligator clip adapter (for A01044)||A08532|
|Panel mount set (2U half)||A02039|
|Panel mount set (2U half twin)||A02040|
|Rack mount set (JIS 2U half)||A02263|
|Rack mount set (JIS 2U half twin)||A02264|
|Rack mount set (EIA 2U half)||A02463|
|Rack mount set (EIA 2U half twin)||A02464|
*Go to the input form.
*Go to the download page.
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Function: (1) Graphical display of measured data (2) Data acquisition (3) Remote command setting
*Go to the download page.