Safety Considerations; Safety Earth Ground - Keysight Technologies 53147A Service Manual

Safety Considerations

Read the information below before using this instrument.
The following general safety precautions must be observed during all phases of
operation, service, and repair of this instrument. Failure to comply with these
precautions or with specific warnings elsewhere in this manual violates safety
standards for design, manufacture, and intended use of the instrument. Keysight
Technologies assumes no liability for the customer's failure to comply with these
requirements.

Safety Earth Ground

An uninterruptible safety earth ground must be maintained from the mains power
source to the product's ground circuitry.
WHEN MEASURING POWER LINE SIGNALS, BE EXTREMELY CAREFUL AND
WARNING
ALWAYS USE A STEP-DOWN ISOLATION TRANSFORMER WHICH OUTPUT
IS COMPATIBLE WITH THE INPUT MEASUREMENT CAPABILITIES OF THIS
PRODUCT. THIS PRODUCT'S FRONT AND REAR PANELS ARE TYPICALLY AT
EARTH GROUND. THUS, NEVER TRY TO MEASURE AC POWER LINE
SIGNALS WITHOUT AN ISOLATION TRANSFORMER.
INSTRUCTIONS FOR ADJUSTMENTS WHILE COVERS ARE REMOVED AND
WARNING
FOR SERVICING ARE FOR USE BY SERVICE-TRAINED PERSONNEL ONLY. TO
AVOID DANGEROUS ELECTRIC SHOCK, DO NOT PERFORM SUCH
ADJUSTMENTS OR SERVICING UNLESS QUALIFIED TO DO SO.
ANY INTERRUPTION OF THE PROTECTIVE GROUNDING CONDUCTOR
WARNING
(INSIDE OR OUTSIDE THE PRODUCT'S CIRCUITRY) OR DISCONNECTING
THE PROTECTIVE EARTH TERMINAL WILL CAUSE A POTENTIAL SHOCK
HAZARD THAT COULD RESULT IN PERSONAL INJURY. (GROUNDING ONE
CONDUCTOR OF A TWO CONDUCTOR OUTLET IS NOT SUFFICEIENT
PROTECTION.)
6 Keysight 53147A, 53148A, and 53149A Assembly Level Service Guide