Reference Test Block No. 1 acc. to ČSN EN 3452/3
The reference block type 2 (ISO 3452-3) is used for verification of the penetration system's (ISO 3452-1) operation (performance) at the beginning of each period.
The PSM-5 panel is used for verification of operation (performance) of the system (ČSN EN ISO 3452-1) at the beginning of each working period.