Keithley 228a instruction manual

The model can be used as a constant Voltage Source or a constant Current source. It has four quadrant operation. This means that the voltage or current sources can operate as a source or a sink in either positive or negative polarities.

Full power capability of W may be obtained in any quadrant. Parameter entry is done in one of two ways. Either using the data keypad to enter the desired value into the display or using the display modify function. The display modify function allows the user to modify either display by selecting a digit of the display and incrementing or decrementing that digit with the appropriate keys.

With the carry, borrow and autorepeat capability, front panel operation is flexible and easy to program. The user selects the range with the decimal point. The model has a point data memory that allows the user to store up to unique values of current, voltage and dwell time for future use.

Once a particular level is stored in the data memory, the user need not reprogram that level The output terminals are located on a quick disconnect board that inserts into the rear panel of the mainframe. The output is disconnected from the quick disconnect board when it is removed from the mainframe.

The programs include: Program 1 Copy for duplicating memory location information. Program 2 Sink for sink only operation. Program 4 MOD V for modulating output voltage. Program 5 MOD I for modulating output current. Program 6 Test for model self test. Program 9 Reset for resetting the model to factory set values. See paragraph 3. The left display has two display modes voltage and memory step. IEEE bus operation is standard. This enables the Model to be incorporated into a system that uses programmed control over the IEEE bus.

Single step, single cycle and continuous memory modes control the sequence between data points in the point data memory. Output terminals are located on the quick disconnect board for optimum safety. The output terminals, the sense terminals, current monitor terminals and the external modulation terminals are also located on the quick disconnect board. When one configuration is required, simply insert into the mainframe.

In this way, cumbersome rewiring of one board is avoided. Remote and Local Sensing. This allows the user to sense at the output terminals or at the load or source. Four Quadrant Operation. This means that the voltage or current outputs can operate as a source or a load in either positive or negative polarities. The front panel compliance graph shows the user where the model is operating source or sink.

User Manual. The chapters in this booklet have been written to aid the user in some applications. For a complete explanation of the instrument including front panel controls and IEEE bus operation refer to the model Instruction Manual Document Number Quick Reference Guide.

Service and User Manual. Section 2 contains safety instructions and a general operating procedure. Section 3 contains front and rear panel descriptions, a general operating procedure and specific operating examples showing how to use the model Section 4 contains information pertaining to the IEEE bus, including primary address selection, device- dependent command programming, bus connection and several sample programs.

Section s includes a procedure to verify the performance of the model Section 6 contains theory of operation with detailed schematics and block diagrams. This section facilitates understanding of the individual circuits of the model Section 7 contains servicing information for the Model Calibration, troubleshooting, line voltage selection, fuse replacement and static sensitive device information is contained in this section.

Section 8 gives replaceable parts information. Add Comment. Notify me of new comments via email. Remember my form inputs on this computer. Remote and Local Sensing. This allows the user to sense at the output terminals or at the load or source. Four Quadrant Operation. This means that the voltage or current outputs can operate as a source or a load in either positive or negative polarities. The front panel compliance graph shows the user where the model is operating source or sink.

User Manual. The chapters in this booklet have been written to aid the user in some applications. For a complete explanation of the instrument including front panel controls and IEEE bus operation refer to the model Instruction Manual Document Number Quick Reference Guide.

Service and User Manual. Section 2 contains safety instructions and a general operating procedure. Section 3 contains front and rear panel descriptions, a general operating procedure and specific operating examples showing how to use the model Section 4 contains information pertaining to the IEEE bus, including primary address selection, device- dependent command programming, bus connection and several sample programs.

Section s includes a procedure to verify the performance of the model Section 6 contains theory of operation with detailed schematics and block diagrams. This section facilitates understanding of the individual circuits of the model Section 7 contains servicing information for the Model Calibration, troubleshooting, line voltage selection, fuse replacement and static sensitive device information is contained in this section.

Section 8 gives replaceable parts information. Comments No comments yet. Be the first! Add Comment. Notify me of new comments via email.

I have read and agree to the terms and conditions.