Wavetek ANT-20 Operating Manual

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Wavetek ANT-20 Operating Manual Manual pdf 15 page image

ANT-20SE Optical InterfacesMaintenance M-33 Installing the optical interface3.1 Safety precautions for preventing electrical accidentsOpening covers or removing parts with a tool can expose live parts. Terminal points may alsobe live.Disconnect the instrument from all voltage sources before opening it. If calibration, maintenanceor repair of the open instrument must be carried out with power connected, then this should beperformed by a trained technician who is familiar with the risks involved.Capacitors in the instrument may retain charge even when the instrument has beendisconnected from all voltage sources. Heed the circuit diagrams!3.2 Measures for preventing electrostatic damageElectrostatic charges and fields can damage or even destroy semiconductors.It is thus necessary to protect all semiconductor components used in this instrument againstelectrostatic charges and fields.When the instrument is closed, this is no problem. When the instrument is open, electrostaticallysusceptible boards and subassemblies are designated with the DIN 40 021 warning symbol.Special measures must be taken to protect these boards and subassemblies.Fig. M-3 Warning symbol to DIN 40 021Special measuresGrounded person Only “grounded persons” working at an electrostatically protectedworkstation may reach into the instrument.Wristband The technician must be grounded via the wristband of theelectrostatically protected workstation.Grounding cable The grounding cable is connected to ground (earth) potential.The following can be considered to be at ground potential:• the instrument ground jack• the protective earth connection• another device at ground potential