3.16. Example Measurement Setups
The M81-SSM can be configured for a wide variety of measurements. The following examples show the recommended wiring for a few common applications.
Resistance Measurement
Current source with voltage measurement
Figure 3.37 Resistance measurement using a BCS-10 module and a VM-10 module
The configuration illustrated above is a four-wire resistance measurement. It accurately determines resistance from milliohms to over a hundred gigaohms. Guarded tri-axial current source connections improve accuracy and settle time when measuring large resistors. This configuration resolves micro-ohm changes when set up to do lock-in measurements.
The configuration uses the balanced current source (BCS-10) module to provide current and measures the resulting voltage with the voltage measure (VM-10) module.
Earth and measure ground are connected together at the enclosure. The outer shell of the BCS-10 triaxial connectors provides earth ground while the outer shell of the VM-10 BNC connectors provides measure ground.
Voltage source with current measurement
Figure 3.38 Resistance measurement using a VS-10 module and a CM-10 module
The configuration illustrated above is a two-wire resistance measurement. It is capable of accurately determining resistance from a few ohms to over a hundred gigaohms. This configuration can resolve micro-ohm changes when set up to do lock-in measurements.
The configuration uses the voltage source (VS-10) module to provide voltage and measures the resulting current with the current measure (CM-10) module.
Earth and measure ground are connected together at the enclosure. Earth ground is connected using a screw on the rear of the CM-10 module. The BNC shells of the modules provide measure ground.
Figure 3.39 Resistance measurement using VS-10, CM-10, and VM-10 modules
Adding a CM-10 module to this configuration provides a four-wire measurement. This improves the accuracy of measuring small resistances.
Diode Characterization
Figure 3.40 Diode measurement using VS-10, CM-10, and VM-10 modules
The configuration illustrated above is a four-wire diode measurement. It is capable of quickly and accurately determining the I-V characteristics of a diode.
The configuration uses the voltage source (VS-10) module to provide voltage and measures the resulting current with the current measure (CM-10) module. A voltage measure (VM-10) module creates a four-wire measurement to improve accuracy when the diode is conducting large amounts of current.
The parameter sweeping feature and the data streaming feature allow for rapid I-V characterization. Lock-in capabilities allow for highly sensitive measurements.
Earth and measure ground are connected together at the enclosure. Earth ground is connected using a screw on the rear of the CM-10 module. The BNC shells of the modules provide measure ground.
Transistor Characterization
Field Effect Transistor
Figure 3.41 FET transistor measurement using VS-10, CM-10, and VM-10 modules
The configuration illustrated above is a FET transistor measurement. This configuration can quickly and accurately determine the I-V characteristics of a FET transistor.
The configuration uses two voltage source (VS-10) modules to provide voltage to the gate and drain terminals. The current measure (CM-10) module holds the source terminal at zero volts.
The parameter sweeping feature and the data streaming feature allow for rapid I-V characterization. Lock-in capabilities allow for highly sensitive measurements.
Earth and measure ground are connected together at the enclosure. Earth ground is connected using a screw on the rear of the CM-10 module. The BNC shells of the modules provide measure ground.