Rohde & Schwarz RT-ZC20B Manuel D'utilisation page 45

Instructions for Electrostatic Discharge Protection
Risk of damaging electronic components
To avoid damage of electronic components, the operational site must be
protected against electrostatic discharge (ESD).
Floor mat
The following two methods of ESD protection may be used together or
separately:
, Wrist strap with cord to ground connection
, Conductive floor mat and heel strap combination
1171.0300.62
Instructions - Instrucciones
Heel strap
E/Esp-3
Wrist strap with cord
Ground connection
of operational site