Be sure to learn about the offset compensation function of Keithley's DMM7510 multimeter

Offset compensation is a measurement technique that reduces or eliminates thermal electromotive forces (EMFs) in low-level resistance measurements. The voltage offsets due to the presence of thermal electromotive forces (VEMFs) can adversely affect resistance measurement accuracy, and to overcome these offset voltages, offset compensation ohms can be used.

Today, Antai Test will use actual test cases to understand the differences in testing when using or not using the multimeter offset compensation function.

Test Equipment:

A Keithley DMM7510 multimeter

A computer that has been set up to communicate with the DMM7510

Four 1756 type insulated rubber cables

A 20 Ω resistor

Test the connection:

Here, we use the 4-wire method for resistance measurement to eliminate the error caused by the wires. When making connections, you can use the front panel or rear panel terminals. The following figure shows these two different physical connection methods.

(Note that you must use either the front or rear terminals. You cannot mix front and rear connections.)

Figure: Front panel connection diagram for 4-wire resistance measurement

Figure: Rear panel connection diagram for 4-wire resistance measurement

Test Results

From the table below we can get the test results with and without the offset compensation function. Therefore, in low-level resistance measurement, it is recommended to turn on the offset compensation function.

Table: Test results with offset compensation turned off and on

DMM7510 Applications

Figure: Front panel connection diagram for 4-wire resistance measurement

The Keithley DMM7510 is a high-resolution precision digital multimeter (DMM), a graphical touch screen, and a high-speed, high-resolution digitizer. It has a resistance sensitivity of 0.1 µΩ and is ideal for measuring small resistors, such as thermistors in laser diode modules.

In addition, the Keithley DMM7510, which combines both accuracy and sensitivity, is also suitable for applications such as low-power testing, battery open-circuit voltage testing, and nanogenerator testing.