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4-Channel DC Voltage Current Source/Monitor
6540 / 6541

Two models: system-use type and benchtop type

The 6540 and 6541 are 4-channel compact DC Voltage Current Source/Monitors.
The 6540 is a model designated for system use without a display, and is optimal for production lines or inspection lines. On the other hand, the 6541, that is a benchtop model equipped with a display and an operation panel, was designed for R&D use with the emphasis on visuality and operability.
The 6540/6541 comes with a USB interface and external control signals for synchronization among units or devices. Optionally, GPIB and LAN interfaces are available on the 6541 only.


Source and measurement functions 
Voltage or current source, and voltage, current or resistance measurement can be selected by specifying the source and measurement functions. The LO terminals internally connected. 

Voltage and current source modes
There are four voltage or current 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 500 μs, or 100 μs without measurement.

HI/LO limit separate setting 
In voltage or current source, the HI/LO limit settings are very important.The 6540/6541 has a function that can set the HI and LO limits individually. Furthermore, for the voltage limit, both HI and LO limits can be set homo-polar. This prevents capacitors or batteries 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.

Suspend function
The 6540/6541 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). Consequently, unnecessary relay ON/OFF operations can be omitted. Using this function will prevent throughput reduction due to relay operating time, and extend relay lifetime dramatically, increasing 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.

Synchronous source and measurement 
The 6540/6541 can synchronize measurements in the DC source mode, and sources and measurements in the pulse source or sweep source mode. Not only the same waveforms but also different waveforms can be generated or measured. Arbitrary master channel and slave channels are selectable.

  6540 6541
Number of digits for generation 4½桁
Output method Bipolar

Maximum output (top)

Minimum resolution (bottom)


±10 V / 500 mA (1 A for 4 channels)

100 μV


±500 mA / 10 V (1 A for 4 channels)
 100 pA
Number of digits for measurement
Accuracy (typical range) 0.02 % 
Minimum measurement resolution Voltage  10 μV
Current 10 pA 
Output noise (20 MHz or less) 4 mVp-p
Minimum pulse width 50 μs
Display None (LED indicators only)  4.3 inch color LCD display

USB port per channel

4 USB ports in total

Single USB port

GPIB port (option)

LAN port (option)

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