2-22. Grounding Considerations
Observe the current and grounding requirements described in the following
paragraph.
2-23. In order to avoid ground loops, the laser head base should be the only connection to earth ground To
accomplish this, the outputs of the ±15 Volt power supplies used to power the laser head should be floating (The +5
Volt power supply required for the HP 10740A-based electronics should also be floating.) Alternatively, any other
single point earth ground connection can be used to satisfy grounding requirements
2-24. Power Supply Requirements
2-25
Table 2-3
lists the supply voltages, currents, and tolerances required by the HP 5517B/C/D Laser Head
Note that other components of the system also use ±15Volts Add these to the laser head current requirements to
obtain the overall system requirements.
Table 2-3. HP 5517B/C/D Power Supply Requirements
2.2 Amperes
Maximum (During
Warmup)
1 5 Amperes
Maximum (During
Operation)
0 02 Amperes Maximum (During
Warmup and Operation)
Other Power Supply Requirements
60 millivolts peak-to-peak maximum
Over Voltage Protection (Recommended)
Under Voltage Protection - current limited (Recommended)
2-26. Power Dissipation
2-27 The HP 5517B/C/D dissipates approximately 23 watts during operation.
2-28. Fusing
2-29. The HP 5517B/C/D has three internal fuses: two that protect the laser head's ±15V lines (both of which are
located on the Al Connector Board Assembly), and one fuse that protects the +15V line to the digital and analog
circuitry located on the A3 Controller/Reference Assembly (and is located on the A3 Assembly) All three fuses are
accessible by removing the left and right covers of the laser head.
To Next Page
Loading...
Need help?
General
