FDI2056 Use
r’s Manual
v 2.0 r 1.1
– 03/13
Copyright © 2013 Metrolab Technology SA
4
www.metrolab.com
2-2 FDI 2056 FRONT PANEL AND CONNECTIONS
The 4-character display indicates the FDI
2056’s current gain or
state.
The signal amplitude can be monitored on the LED bar-graph. The
effect of changing the gain will be immediately visible. If the +OVR
and
–OVR lights come on, the measurement can be considered
questionable.
Encoder input connector and LED: When using a rotational or linear
encoder in your measurement system, this input will let you
generate trigger signals which can be used to accurately
synchronize your measurements to your mechanical system.
See section 2-2-1 for the connector pinning description.
The coil can be connected to the FDI 2056 either via the two LEMO
00 connectors, “IN+” and “IN-“, or via the single LEMO 0B
connector.
The FDI 2056 is supplied with a 10 m cable with a LEMO 0B
connector. The FDI 2056 coil input characteristics can be adapted
for your application.
See Section 5-2 for details.
The “REF. CLK 20MHz” allows the FDI 2056 time base to be
checked with a precision counter. Please note that the reference
oscillator is the one located on the board plugged into slot 2.
This yellow LED blinks each time a trigger event is internally
generated when making a measurement.
The trigger
“IN” is a 3.3V, 5V-tolerant TTL input. The software-
selected edge of the Trigger
“IN” signal determines when partial
integrals are computed. Each trigger pulse ends the previous partial
integral (if there was one) and starts a new one. Thus, a sequence