The diagrams below show typical influence of variations in the environmental parameters: temperature, humidity and air pressure. The reference conditions are 23ºC (73,4ºF), 50% relative humidity and an air pressure of 101,325 kPa.

Typical sensitivity to temperature:

Typical sensitivity to air pressure:

Typical sensitivity to humidity:

General Sound calibrator class 1 according to EN/IEC 60942 : 2017 Class 1 and ANSI/ASA S1.40-2006 (R2011).

Microphone size: 1/2” and below via adapters
Calibrator frequency ( @ Reference conditions): 1000 ±1.00 Hz
Generated Sound Pressure Level relative to 20µPa (@ Reference conditions): 114.0±0.2 dB
Distortion: Max 2.0 %
Stabilizing time: 20 seconds
Sensitivity to environmental conditions: As specified for IEC 60942 class 1 / ANSI S1.40.
Environmental range for specified operation:
Temperature: -10ºC to +50ºC / 14ºF to 122ºF
Relative humidity: 25 % to 90 %
Air pressure: 65 kPa to 108 kPa
Additional specifications for the built in ambient measurement sensors:
Power off: By power switch or when microphone is removed (may be deactivated)
Battery type: 2 x LR03 alkaline batteries (AAA-size)
Battery life: > 10 hours
Battery low: Automatically switching off if battery voltage too low
Weight: 125 g / 0.28 lb
Size ( LxWxH ): 97 x 51.5 x 41 mm / 3.8 x 2.0 x 1.6“

Accessories included: (may vary if supplied as part of a sound level meter kit):

• Accredited calibration
• 2 x AAA batteries
• Instruction manual
• Leather pouch Nor1345

Accessories available:

• 1/4” microphone adapter Nor4590

• Product data: Nor1255 Class 1 Sound Calibrator

Type approvals:

• PTB – Germany
• BEV – Austria
• LNE – France

Certifications:

• Declaration of Conformity