User manual

322
Appendix
Information for Calibration
Type Description
Integrating sound level meter type NTi Audio XL2-TA•
Standards
The XL2-TA Sound Level Meter has been certified in accor-
dance with the class 1 requirements of
ISO 61672-1 (2014 und 2003)•
ISO 61672-2 (2014 und 2003)•
ISO 61260 (2014 und 2003)•
DIN 45657 (2014)•
Welmec 7.2 «Software Guide» (2011)•
Approval Identification
The XL2-TA Sound Level Meter requires the approved firmware
listed in the following table:
Germany Switzerland Austria
Firmware V4.21 Firmware V4.11 Firmware V4.21
Certificate No.:
DE-16-M-PTB-0003
A3
98
OE 14
s 020
Hints for Performing the Electrical Measurements
Electrical input facility
(Refer IEC61672-1 paragraphs 5.1.15, 9.3.g)
The capsule replacement NTI-K65-15 is used to insert electri-
cal signals to the preamplifier MA220. The device provides at
one side a contact that corresponds to the center contact of
the replaced microphone capsule, at the other side a BNC-
plug for the electrical signals. The impedance at the output
of the device is 15 pF with a maximum deviation of ±1 pF.
The electrical noise floor is measured by shorting the con-
tacts of the BNC plug. Before the NTI-K65-15 can be mount-
ed to the preamplifier MA220, the microphone capsule must
first be detached. The nominal sensitivity S of the capsule is
S = 42 mV/Pa. Measurements with the NTI-K65-15 therefore
require that the sensitivity in the calibration menu is manually
adjusted to S = 42 mV/Pa. The linear operating ranges accord-
ing to IEC 61672 have been verified during the type approval
procedure.
Certified Calibrator
The following sound level calibrators are certified with the
XL2-TA with a 114 dB, 1 kHz reference signal.
Larson Davis CAL200 •
B&K 4231•
Norsonic Nor-1251•