Anritsu MG3641A - Manual (Page 32)

SECTION 2 PRECAUTION
2-2
To protect circuits from an abnormal rise in the internal temperature, the MG3641A/MG3642A has a built-in
thermal protector. When the thermal protector operates, the MG3641A/MG3642A enters stand-by status (the stby
lamp lights).
If the thermal protector starts operating, check conditions surrounding the device and, after lowering the temperature
sufficiently, reset switch
● ●
| on the rear panel. If the thermal protector enters operation repeatedly, the fan may be
broken. In this case, have it repaired.
2.2 Safety Measures
This section explains the safety measures required in any case to prevent the operator from being endangered and
avoid device damage and serious system-down.
2.2.1 General power supply safety measures
CAUTION
Before power-on : Be sure to ground the MG3641A/MG3642A. If the power is turned on without the
protective grounding, it may result in an electric shock causing death or injury.
Also be sure to check the AC line voltage. Applying an abnormal power exceeding
the determined value to the device may damage the device and cause fire.
During power supply : To maintain the MG3641A/MG3642A, the operator may have to check and adjust the
internal units while opening its cover during power supply. The internal units contain
some high-voltage dangerous parts. If the operator touches them carelessly, it may
result in an electric shock that affects a person's life and injury. For maintenance of
this device, contact qualified service personnel.
2.2.2 Reverse power input to RF output connector
The MG3641A/MG3642A has a reverse power protector in the output unit to protect the internal circuits from a
reverse input overpower. The reverse power protector can protect the following power:
•
±50 Vdc
• 50 W (Up to 1040 MHz)
• 25 W (1040 to 2080 MHz, MG3642A)
CAUTION
The reverse power protector uses a mechanical switch. If a reverse power is applied frequently, the contact is
consumed. To use this protector, take maximum care not to apply a reverse power. Also never release the
reverse power protector as a reverse power remains applied, or a fault will occur in the reverse power protector.
The impedance of the RF output connector is opened during operation of the reverse power circuit. Be careful
to avoid damage due to a mismatched transmitter, etc.