GE IC697VAL348 DAC Zero Offset and Gain Calibration, Channel Offest Pot, Gain Pot, P3 Connector

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2

DAC Zero Offset and Gain Calibration

Note

This procedure assumes that the offset binary coding jumper (JA) is selected.

1.Remove power from the Digital-to-Analog Converter Board.

2.Remove any cable connected to the P3 connector.

3.Remove the Digital-to-Analog Converter Board from the chassis assembly and install a VMEbus Extender board in its place.

4.Install the Digital-to-Analog Converter Board onto the VMEbus Extender board.

5.Apply power to the module and allow 15 minutes for Temperature Stabilization before making any measurements.

6.Using the IMMEDIATE UPDATE MODE write digital code 4100 HEX to the CSR location XXXX0070. This HEX code is the Control Word for output to the Digital-to- Analog Converter Board’s P3 connector.

7.Write 8000 HEX to each of the eight DAC channels at addresses XXXX0060 through XXXX006E.

8.Using a 6-digit multimeter, monitor each DAC output at the P3 connector. Connect the negative lead to connector P3 pin C2. Adjust each DAC's offset potentiometer for a voltage of 0.0000 ±60 µV. Refer to Table 2-4 below and Figure 2-6 on page 2-16 for the Potentiometer Location and P3 connector pin for each channel.

Table 2-4. Digital-to-Analog Converter Board Calibration Table

Channel

1

2

3

4

5

6

7

8

Offest Pot

R23

R19

R31

R27

R3

R7

R15

R11

Gain Pot

R21

R17

R29

R25

R1

R5

R13

R9

P3 Connector

A2

A3

A4

A5

A6

A7

A8

A9

9.Repeat Step 7 using digital code FFFF HEX.

10.Using the multimeter, monitor each DAC output at the P3 connector. Connect the negative lead to connector P3 pin C2. Adjust each DAC's gain potentiometer for a voltage of 9.99969 ±60 µV. Refer to Table 2-4 above and Figure 2-6 on page 2-16 for the Potentiometer Location and P3 connector pin for each channel.

11.Remove extender and re-install board into the chassis. Calibration completed.

GFK-2059

Chapter 2 Configuration and Installation

2-15

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Contents GE Fanuc Automation As Used in this Publication CimstarContents Introduction, Description, and Specifications Reference Material and Other GE Fanuc ManualsGeneral Description Functional Description Safety Summary Ground the SystemConfiguration and Installation Physical Installation Do not install or remove boards while power is appliedConfiguration Jumper Function Preset ConditionBefore Applying Power Checklist Digital-to-Analog Converter Board InstallationBoard Address Selection Switches Read this Direction OFF, Open = ON, Closed =Address Modifier Address Modifier Response Selection Digital Code Selection JA Offset Binary TWO’S Complement CodeProgram Controlled and External Start Convert Mode Connector Descriptions Rear View of Board PC Board Row B Signal Mnemonic P2 ConnectorPin Number Row a Signal Mnemonic Row C Signal MnemonicPC Board P3 Connector Row B Signal Mnemonic Row CDigital-to-Analog Converter Board Calibration Table P3 ConnectorDAC Zero Offset and Gain Calibration Channel Offest PotSide Programming DAC Channels 0 to 7 Address Write Only 1Control and Status RegisterDAC Channels Address Map D15 MSB D00 LSBImmediate DAC Update Mode Digital-to-Analog Converter Board Programming OptionsControl Register Data Format and Definitions D09 D08 Delayed DAC Update Mode Test Mode Programming Program Example Delayed DAC Update Mode END Analog Out Pathway Analog Output Control in Immediate DAC Update ModeControl Word D15 to D0 Hex Value DAC Programming Sequence Delayed DAC Update Mode Analog Output Control in Delayed DAC Update Mode Theory of Operation Operational Overview Immediate DAC Update Mode Program Control Update Mode Digital-to-Analog Converter Board Functional Block Diagram VMEbus Interface Description A01 A02 A03 A04 VMEbus Interface Logic and Interface Signals DIG GND Maintenance
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