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DC Voltage Current Source/Monitor
6240B
- Source and measurement range
- Voltage: 0 to ±15 V, Current: 0 to ±4 A (1 A for DC)
- Source and measurement accuracy: ±0.02 %
- Measurement display of 5½ digits with resolution of 1 μV/100 pA
- Source/sink of ±4 A for the maximum pulse width of 20 ms
- Pulse measurement with minimum pulse width of 50 μs and 1 μs step
- Sink-enabled bipolar output
- Low-resistance measurement canceling thermal electromotive
force for conductive materials
The 6240B is a SMU equipped with a high-speed response pulse source and measurement function and a low-resistance measurement function. It has 4½-digit display for voltage and current source and 5½-digit display for measurement, and features high accuracy of ±0.02 %. There are four types of sweep modes available: liner, fixed, random and 2-slope linear sweep, and also pulse measurement with a minimum pulse width of 50 µs is available. Thus, this model can be widely used as evaluation power supply for developing semiconductors and other electronic components and as power supply of characteristic test systems used in production lines.
Moreover, the 6240B is capable of high-precision contact resistance measurement that cancels thermal EMF generated on metal contact surfaces.
Features
Source and measurement function
Voltage/current source and voltage/current/resistance measurement can be selected by specifying the source and measurement functions.
Output range
Voltage and current source mode
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 (arbitrary waveform generation by user programming), 2-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.
HI/LO Limiter separate setting
In voltage or current source, the HI/LO limiter settings are very important. The 6240B allows separate setting of HI and LO limiters. 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 that are used at a constant current and do not tolerate reverse voltage application.
Suspend function
The 6240B 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 operations.
Consequently it prevents throughput reduction due to relay operating time, extends relay lifetime and increases product reliability.
In addition, the setting of a suspend voltage (voltage in HiZ and LoZ status) can prevent transient current from being generated when connecting voltage sourcing devices such as batteries.
When a conventional generator or electronic load is connected with a battery, the output voltage is 0 V, 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 the suspend voltage, the 6240B is connected in highimpedance state at the specified voltage and then the setting current flows. This prevents unnecessary discharge at the connection to the battery.
Comparison of transient current at output ON
The left figure shows the comparison of transient current when the output status is set to Operate with IS=500 mA, VL=±3 V, Vbatt=1.5 V and load resistance = 1 Ω. When setting Vsus = 0 V, transient current of 1.3 A flows at 1.3 V. When setting to Vsus = 1.5 V, it becomes almost 0 A.
High-speed response and low noise
The following shows a representative response waveform and output noise. The response between 0 V and 10 V is approximately 30 µs at 0 to 90 % rising time and the output noise is approximately 2.4 mV p-p from DC to 20 MHz.
Low-resistance measurement with pulse current unaffected by heat
The 6240B achieves low-resistance measurement without being affected by self-heating of DUTs by using pulse current application, bringing more precise measured values with little errors.
If 0.5 Ω resistance is measured with DC current and pulse current
Source current: 1 A, pulse width: 25 ms, duty factor: 10 % In DC measurement, the measured values fluctuate due to self-heating of the resistor. In pulse measurement, the measured values are not affected by the self-heating
Applications
Low resistance measurement of conductive materials
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.
Diode temperature dependence evaluation
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
Battery charge/discharge tests and power device evaluation
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.
Specifications
| Number of digits for generation | 4½ | ||
| Output method | Bipolar | ||
|
Maximum output (top) Minimum resolution (bottom) |
Voltage |
±15 V/1 A |
|
| 10 μV | |||
|
Current |
±4 A/10 V (DC: ±1 A/15 V) | ||
| 1 nA | |||
| Number of digits for measurement | 5½ | ||
| Accuracy (typical range) | 0.02 % | ||
| Minimum measurement resolution | Voltage | 1 μV | |
| Current | 100 pA | ||
| Maximum measurement resistnace / Minimum resolution |
0.75 GΩ/0.25 μΩ | ||
| Pulse application / Measurement | Available | ||
| Minimum pulse width | 50 μs | ||
| Interface | USB, GPIB | ||
*For the detailed specifications, please download the brochure from "Download."
Appearance
Optional Accessories
| Name | Part Number |
| Test fixture | 12701A |
| 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) | |
| BNC-BNC cable (1.5 m) | A01036-1500 |
| 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 |
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