YOKOGAWA GS820 Multi Channel Source Measure Unit

Description of YOKOGAWA GS820

Four-quadrant operation consisting of source operation (current source) and sink operation (current sink) is available with ranges up to 7 V and 3.2 A or 18 V and 1.2 A. The output and measurement resolutions are 5.5 digits. Other features include:

• Isolated 2-channel source and measurement function
• Source and measurement ranges:

​18V model: 7 V and 3.2 A or 18 V and 1.2 A
50V model: 20 V and 1.2 A or 50 V and 0.6 A

• 1 pA resolution at extremely small current range 200 nA
• Generate arbitrary waveforms consisting of up to 100,000 points at 100 μs intervals
• Channel expansion through master-slave synchronization link
• Fast test speeds
• 16-bit digital I/O (model 765602/12)

​Source and Measurement Range

Four-quadrant operation consisting of source operation (current source) and sink operation (current sink) is available. The output and measurement resolutions are 5.5 digits. Two models are available for your application.

18 V model (765601/02)

• Voltage ranges

200 mV, 2 V, 7 V, and 18 V

• Maximum output current:

​ ±3.2 A (at an output voltage of ±7 V or less) ±1.2 A (at an output voltage of ±18 V or less)

• Current ranges:

​200 nA, 2 µA, 20 µA, 200 µA, 2 mA, 20 mA, 200 mA, 1 A, and 3 A

• Maximum output voltage:

​±18 V (at an output current of ±1.2 A or less) ±7 V (at an output current of ±3.2 A or less)

50 V model (765611/12)

• Voltage ranges:

200 mV, 2 V, 20 V, and 50 V​

• Maximum output current:

​ ±1.2 A (at an output voltage of ±20 V or less) ±0.6 A (at an output voltage of ±50 V or less)

• Current ranges:

​200 nA, 2 µA, 20 µA, 200 µA, 2 mA, 20 mA, 200 mA, 0.5 A, and 1 A

• Maximum output voltage:

​±50 V (at an output current of ±0.6 A or less) ±20 V (at an output current of ±1.2 A or less)

Construction and Functions of YOKOGAWA GS820

The GS820 is equipped with two analog channels with each channel consisting of a constant voltage source VS, a constant current source IS, a voltmeter VM, and an ammeter IM.
The two source measure channels are isolated.

Source and Measurement Functions

• Voltage source and current measurement (VS & IM)
• Current source and voltage measurement (IS & VM)
• Voltage source (VS)
• Current source (IS)
• Voltmeter (VM)
• Ammeter (IM)
• Resistance meter (IS&VM)

​These functions can be selected for each channel to form an arbitrary combination of functions.
Allows voltage sensing of a two-wire system or four-wire system by switching between local sense and remote sense.

*1: Device Under Test
*2: For DUT voltage measurement

Combination of Source and Measurement Functions

The combination of the source and measurement functions of two channels allows the testing of various DUTs.

Source and Measurement Timing

Basic Source Measurement Timing

The GS820 performs generation and measurement using its internal timer or a trigger input such as an external input signal. When a trigger signal is received, the GS820 starts generating a signal after the source delay time elapses and carries out a measurement after the measure delay time elapses over a given integration time. The measurement integration time can be set in the range of 0.001 PLC to 25 PLC.*² Additionally, the GS820 provides an auto zero measurement function, which measures the internal zero reference after the measurement and performs offset correction in real-time. The integration time of the auto zero measurement is equal to the measurement integration time setting.

Timing Settings Using Various Trigger Sources

The GS820 allows the generation trigger source and measurement trigger source to be set separately. There are two types of constant period timers and an external signal input that can be used for the generation trigger source. In addition to these sources, source change point and sweep end point can be used for the measurement trigger source. Because the source trigger and measurement trigger can be set separately and also separately for each channel, source and measurement under various connection conditions and timing combinations can be accommodated. There is also an auxiliary trigger that can be activated using an external signal or a program event. The source delay, measure delay, and integration time can be set separately for each channel.

Asynchronous Operation of Source and Measure

The various trigger sources available on the GS820 allow the source and measurement to be executed asynchronously. The figure below shows an example in which separate timers are used for the source and measurement to achieve multiple measurements in a source cycle.

Sweep Function 1: Preset Sweep

The voltage/current generation block of the GS820 operates in DC generation mode or pulse generation mode. Each generation mode has preset operation modes such as continuous output, linear sweep, and log sweep that allow the user to perform sweep operations by setting simple parameters. The output level can be changed at a minimum of 100-µs intervals*¹ in each sweep mode.

*1: Minimum program cycle

100 µs: If the measurement function is OFF
500 µs: If the measurement function is ON, two channels are used, and auto zero is OFF

Sweep Function 2: Arbitrary Waveform Generation of Up to 100,000 Points and Simultaneous Sweeping of Control Parameters

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