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Installation 39
Power Test
Note The following checkout assumes that the Electronic Load is set to the factory defaults. Refer to Chapter 4
if you need to recall the factory default values.
Use a power supply with the voltage set to 10 V and the current limit set to 10 A to check the input circuit on each module.
The settings of the power supply and the values used in the procedure were selected so that they can be used with any
module. You can use different settings, but the results of the test will obviously differ from the results shown in the
procedure.
1. Connect the power supply to the input binding posts of the first channel in the Electronic Load
using heavy wires to minimize the voltage drop in the wires.
2. Observe that the front panel of the Electronic Load displays the voltage that the power supply
was set to (10 V).
3. Depress the following front panel keys in the indicated order:
4. Observe that the Electronic Load is drawing 5 A and is operating in CC mode. The power
supply should be operating in CV mode. The Electronic Load front panel display should appear about the
same as the one shown in Figure 3-7.
Figure 3-7. Power Test Display
5. Depress the
key.
6. Observe that the front panel display indicates about 50 W.
7. Repeat the steps 1 through 6 for any other modules m your mainframe.
8 Turn off the Electronic Load, disconnect the power supply, and continue with the rear panel
connections.
Controller Connection
The GPIB connector on the rear panel connects the Electronic Load to the controller and to other GPIB devices. A GPIB
system can be connected in any configuration (star, linear, or both) as long as:
•
The total number of devices including the controller is no more than 15.
• The total length of all cables is no more than 2 meters times the number of devices connected together, up to a
maximum of 20 meters.
Note IEEE Std. 488-1978 states that you should exercise caution if an individual cable length exceeds 4 meters.
Do not stack more than three connector blocks together on any GPIB connector. The resultant leverage can exert excessive
force on the mounting panels. Make sure that all connectors are fully seated and that the lock screws are firmly hand-
tightened. Use a screwdriver only for the removal of the screws.