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Norsonic 1251 and 1252 Specifications

Nor 1251	Precision Sound Level Calibrators - class 1	£ 3 a day *
Nor 1252	Precision Sound Level Calibrators - class 2	£ 2 a day *

Specifications	1251	1252
IEC 60942 Class	Class 1	Class 2
Complies with ANSI S140	Yes	Yes
SPL re 20 µPa	114.0 ± 0.2 dB	114.0 ± 0.4 dB
Frequency	1000 Hz ± 0.2 %	1000 Hz ± 0.2 %
Distortion	< 1%	< 1%
Sensitivity to load volume	+0.0003 dB/mm3	+0.0003 dB/mm3
Typical change in SPL per year	< 0.02 dB	< 0.02 dB
Time for level to stabilize	< 2 sec.	< 2 sec.
Microphone size *	1"   1/2"   1/4"	1/2"   1/4"
Temperature range	-10 °C to +50 °C	-10 °C to +50 °C
Ambient pressure range	65 to 108 kPa	65 to 108 kPa
Humidity range	10 to 90 %RH	10 to 90 %RH
Battery type	9V - 6LR61	9V - 6LR61
Battery life	> 30 hours	> 30 hours
Adaptor - 1/4" *	Nor 1444	Nor 1445
External supply voltage	7.5 to 15 V DC. Automatic shut-off when V < 7.5 V DC
CE classification, EMC	EN 50081-1, EN 50082-1
Safety	EN 61010-1, 1993 portable equipment pollution category 2
Size	Length: 109.5mm, Ø: 40 mm
Weight	185 g with battery
Controls	Power-on push button with green LED indication

E&OE - specifications subject to change without notice.

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