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Chapter 4, FRONT AND REAR PANELS
4.2.13 TRIG IN Connector
4.2.14 TRIG OUT Connector
4.2.15 DAC 1, DAC 2, DAC 3, and DAC 2 Connectors
4.2.16 FIBER LINKS Connectors
4.3 Front Panel - 7124 RCU
4.3.01 A and B/I Signal Input Connectors
4-8
frequencies is required, when it usually gives better results than the REF IN
connector on the front panel.
This connector accepts a TTL-compatible input and can be used for triggering data
acquisition to the internal curve buffer. The input can be set to respond to positive or
negative going edges.
This connector can be set to generate a TTL-compatible output pulse, for example to
indicate when date is being sampled when using the internal curve buffer.
There are four digital-to-analog converter (DAC) output connectors. The output
voltages at these connectors can be configured to represent instrument outputs (e.g.
X and Y channel outputs) or be used as general purpose programmable voltages.
When used as instrument outputs the full-scale output range is ±2.500 V, with the
ability to operate linearly at up to three times this range. When used as general
purpose outputs, the output range is ±10.000 V
These four connectors are used to connect the 7124 main console to the 7124 RCU.
CAUTION: These connectors must be fitted with covers whenever the fibers are
not connected, to prevent ingress of dust or dirt. Any such contamination of the
connectors will impair instrument calibration and may prevent satisfactory
operation. Such contamination is not covered under the instrument warranty.
Figure 4-6, Model 7124 RCU Front Panel Layout
As shown in figure 4-6, the model 7124 RCU has four BNC connectors and an LED
on its front panel. The following sections describe the function and location of these
items.
The A connector is the signal input connector for use in single-ended and differential
voltage mode. The B/I connector is the signal input connector for use in differential
voltage mode (A-B) and for inverting single-ended voltage mode (-B mode). It is
also the signal input connector when the current input mode is selected.
When either input is overloaded the words INPUT OVERLOAD, in the top left-hand
corner of the screen on the main console, flash.
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