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LED’s and Connectors for the Tachometer Option.
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 an edge is detected on the tachometer
signal, so when it is blinking it indicates that the tachometer signal is on. (For an
HP E1432A that does not have the Tachometer option, this LED is defined
differently.)
SMB Connectors
q Tach1: This is one of the two tachometer inputs. Tach1 cannot be configured as
an external trigger.
q Tach2: This is the second of the two tachometer inputs. Tach2 can also be
configured (via software) to be an external trigger input
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
The Tachometer Option
7-5