Appendix A
Humphrey Field Analyzer II - i
Confidential and Proprietary
Field Service Guide
A - 10
52235C1105
A.2.16
Loopback Tool
The Loopback Tool performs external loopback testing of the Data Transfer and Auxilary
serial ports located on the side of the CPU/Backplane enclosure box behind the rear cover
door. The connector loops the transmit line back to the receive line, and the RTS line back to
the CTS line.
A.2.17
Static Protection Kit
The Static Protection Kit is essential for protection of the
HFA II - i
Perimeter against
electrostatic discharge whenever you are disassembling or handling
HFA II - i
Perimeter
circuitry. The kit contains the following items:
#
a bench mat with permanently attached alligator clip ground lead;
#
a banana plug lead with snap connector;
#
an adjustable wrist cuff.
The static protection kit’s bench mat must be properly grounded, and you must be wearing
the wrist cuff whenever working on the
HFA II - i
Perimeter with the cover removed.
To use the static protection kit:
1)
Connect the bench mat alligator clip to a known good electrical ground point.
Any unpainted screw or chassis surface on the
HFA II - i
Perimeter is an acceptable
ground point,
provided that the HFA II - i Perimeter has its power cord connected and
is plugged into a grounded power receptacle.
In situations where work is to be performed on the
HFA II - i
and it is undesirable to
have the unit plugged into a power receptacle, an alternate grounding point is necessary.
Usually, an acceptable ground point can be found at the cover screw for the AC power
outlet. It is useless to use the bench mat without it being properly grounded.
2)
After properly grounding the bench mat, connect the banana plug lead into the bench
mat connector.
3)
Connect the wrist cuff to the snap clip on the banana plug lead.
4)
Adjust the wrist cuff to fit snugly around your wrist. The wrist cuff should always be
worn when working on the
HFA II - i
Perimeter with the cover removed.
A.2.18
Communications Terminals/Laptop
Communication Terminal/Laptop usage with the
HFA II - i
is not possible.
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