Keysight Technologies 53150A - Safety Earth Ground; Acoustic Noise Emissions; Geräuschemission; Electrostatic Discharge Immunity Testing

6 Keysight 53150A/151A/152A Operating Guide
Safety Earth Ground
An uninterruptible safety earth ground must be maintained from the mains power
source to the product’s ground circuitry.
Acoustic Noise Emissions
LpA<47 dB at operator position, at normal operation, tested per EN 27779. All
data are the results from type test.
Geräuschemission
LpA<47 dB am Arbeits platz, normaler Betrieb, geprüft nach EN 27779. Die
Angagen beruhen auf Ergebnissen von Typenprüfungen.
Electrostatic Discharge Immunity Testing
When the product is tested with 8kV AD, 4kV CD and 4kV ID according to
IEC801-2, a system error may occur that may affect measurement data made
during these disturbances. After these occurrences, the system self-recovers
without user intervention.
WARNING
When measuring power line signals, be extremely careful and 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.