Setting the Digitizer Configuration

The digitizer configuration covered in this section includes:

setting the arm sources

setting the arm count

setting the arm delay

setting the reference source

setting the trigger source

sending arm immediate

sending trigger immediate

aborting measurements

Note

Setting the Arm Sources

The trigger count (pre-arm and post-arm reading counts) and the sample rate are set when the timebase processor is initialized. See "Initializing the Timebase Processor" in the section "Re-initiating the Digitizer" for more information.

The registers used to set the arm sources are listed below.

Arm Source register

base + 4916

Arm Control register

base + 4B16 (used when changing arm source while initiated)

Procedure The arm source can be set/changed when the digitizer is in the idle state or while it is initiated.

1.Setting/changing the arm source in the idle state:

A.Write the decimal equivalent bit pattern to the arm source register (base + 4916).

2.Setting/changing the arm source while initiated:

A.Suspend the arm trigger by setting bit 2 of the arm control register (base + 4B16) to ’1’ . Retain the settings of the other register bits.

B.Write the decimal equivalent bit pattern for the desired arm source to the arm source register (base + 4916).

C.Enable the arm trigger by setting bit 2 of the arm control register (base + 4B16) to ’0’ . Retain the settings of the other register bits.

Appendix C

Register Programming 373

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Image 373
HP E1429A manual Setting the Digitizer Configuration, Setting the Arm Sources