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.
Application Examples
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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:
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2-channel display example
(256 x 64 dot matrix display) |
Source and Measurement Range
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.
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GS820 Construction and Functions
Source and Measurement Functions
Allows voltage sensing of a two-wire system or four-wire system by switching between local sense and remote sense. |
Combination of Source and Measurement Functions
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
Asynchronous Operation of Source and Measure
Sweep Function 1
Preset SweepThe 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.
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
*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
The values do not include the hardware operation time corresponding to the control parameters.
Test Sequence Editing
Test Speed
Measured values of test speeds (reference data)*¹
Task | Operation Time | Command Used | Conditions |
Change the source level (1 channel) |
423 µs | :chan1:sour:lev +15.0000 | Measurement function OFF source range fixed to 18 V. |
Change the source level (2 channels) |
910 µs | :chan1:sour:lev +15.0000; :chan2:sour:lev -0.12500 |
Same as above |
Change the range and source level |
978µs | :chan1:sour:rang 18V; lev +15.0000 |
Measurement function OFF |
Change the limiter and source level |
1,048µs | :chan1:sour:lev +15.0000; prot:lev 200µA |
Measurement function OFF, source range fixed to 18 V. |
Switch the source function |
457µs | :chan1:sour:func volt | - |
Measure (1 channel) | 613µs | :chan1:meas? | Integration time 0.001 PLC, auto zero OFF, and external trigger OFF. |
Measure (2 channels simultanesoully) |
820µs | :meas? dual | Same as above |
Change the source level and measure (1 channel) |
985µs | :chan1:sour:lev +15.0000; :chan1:meas? |
Same as above, source range fixed to 18 V. |
Change the source level and measure (2 channels) |
1,686µs | :chan1:sour:lev +15.0000; : chan2:sour:lev - 0.12500;meas? dual; |
Same as above |
*1: Measurement environment
Core 2 Duo processor 2.33 GHz, USB2.0, using LabView
Channel Expansion
Expansion up to 10 Channels Using the Master-Slave Operation
Multiple GS820s can be connected as shown below and used as a multi-channel source measure unit. The master-slave feature allows the program data of all connected channels to be set and collected by simply accessing the master unit. The master unit (1) distributes the source data to the slave units or (2) collects and merges the measured data of all slave units. Complete synchronization of all channels can be achieved by connecting the exclusive trigger signal line.
Zero Generation Function of Voltage and Current
Fast Load Disconnection without Chattering
The zero generation function of the GS820 generates zero voltage or current as well as controls the current/voltage limiter to limit the load current. The GS820 stops applying the voltage or supplying the current to the load in the zero generation state allowing the DUT to be disconnected with the output relay turned ON. This function avoids the problems of chattering and contact life of the output relay and reduces the time for turning ON/OFF the output.
Model | Description |
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765602 | GS820 Multi Channel Source Measure Unit Digital I/O Installed Model |
765601 | GS820 Multi Channel Source Measure Unit Standard Model |