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LEDs and Connectors for the Arbitrary Source Option
Status LEDs
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Fail: This is the standard VXI “Failed” indicator. It lights briefly when powering up
and normally goes out after a few seconds. If it stays on it indicates a hardware failure
in the module.
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Acs: This is the standard VXI “Access” indicator. When it is on, it indicates that
another device on the bus is contacting the module, for example to transfer data or read
registers.
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Source: If this LED is lighted it indicates that the source is on and producing output.
SMB Connectors
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COLA: This is the output connector for the COLA (Constant Output Level Amplifier)
output. This connector can also be configured as a Summer input. A signal connected
to this input is summed with the internal source output to create the final output.
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Shut (Shutdown): Shorting the center pin of this connector to its shield causes the
source to ramp down and shut off.
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Out: This is the main output of the Arbitrary Source. The Out connector can also be
configured to output a calibration signal. This is not quite the same as the calibration
signal described in Chapter 5 because it comes directly from the internal source
without going through the other circuitry of the calibration section.
Input Connectors (One or Two)
These connectors are attached to the cables from an 8-Channel Input (breakout
box.) There are two input connectors for each 8-Channel Input. They connect
the input signal to the VT1433B. Each connector carries four channels.
Depending on options, there can be one or two input connectors (four or eight
channels).
Updating the arbitrary source firmware
When updated firmware for the arbitrary source is available, the ROM in the
module can be updated by using the procedure documented in
/usr/e1432/arbsrc/README.
VT1433B User's Guide
The Arbitrary Source Option
6-5