IOtech Isolator488, Руководство пользователя

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Section 2 Getting Started
2.6
The following options are available on each port:
1. The Shield pin of the IEEE 488 connector (pin 12) may be connected to the
logic common of the IEEE 488 connector (pins 18, 19, 20, 21, 22, 23, and 24) or
left unconnected.
2. Logic common of IEEE 488 connector (pins 18, 19, 20, 21, 22, 23, and 24) may
be connected to the chassis of the Isolator488, connected to the chassis through a
soft ground, or left unconnected.
The following changes may be made to the Controller Port:
1. To remove the Controller common from earth ground, remove R4, and C16 by
either desoldering the components (the bottom panel or the Isolator488 must be
removed in order to do this) or cutting the component leads so that they may be
removed. Make note of this change for later reference.
2. To connect Controller common to earth ground, insert a 1/2 amp fuse in the fuse
clips labelled F2. The 1/2 amp fuse connects the Controller common to earth
ground and limits fault currents to 1/2 amp. Make note of this change for later
reference.
3. To connect pin 12 (shield) of the Controller Port to Controller Common, solder
a jumper wire in the location labeled JPR1. Make note of this change for later
reference.
The following changes may be made to the Instrument Port:
1. To add a soft ground between the Instrument Common and earth ground, insert
a 1 M
Ω
1/4 watt resistor in the location labelled R5. Insert a 0.01 µF 2kv ceramic
capacitor in the location labelled C59. Solder these components in place from the
solder side of the circuit board using rosin core solder. The bottom panel or the
Isolator488 will need to be removed in order to do this. Make note of these
changes for later reference.