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Status LEDs
q 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.
q 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.
q Trigger: This LED flashes on each time the measurement triggers, so when it is
blinking it indicates that the measurement is triggering.
If your HP E1432A has the Tachometer option, this LED is defined differently.
See the chapter: The Tachometer Option (AYF).
SMB Connectors
q ExSamp: This is an input connector for an external sample clock. The sample
clock must be TTL level and have a frequency between 40.96 kHz and 100 kHz.
Internally this frequency can be decimated.
q Cal: This connector is used for calibration. It can be configured to output a
calibration signal or to accept an input calibration signal. See the calibration
section in this chapter.
q ExTrig: This allows for an external trigger input to the HP E1432A. The input
signal must be TTL, other characteristics can be defined in software. ExTrig can
be enabled or disabled in software.
Input Connectors (1, 2, or 4)
These connectors are attached to the cables from an 8-Channel Input
(breakout box) — two input connectors for each 8-Channel Input. They
connect the input signal to the HP E1432A. Each connector carries four
channels. Depending on options, there can be 1, 2, or 4 input connectors
(4 - 16 channels).
HP E1432A User's Guide
Module Description
5-7