Sound and Vibration Instrument Hire and Calibration

Norsonic 1251 and 1252 Specifications

Nor 1251 : Sound Level Calibrators - class 1 precision	£ 3 a day *

Nor 1252 : Sound Level Calibrators - class 2	£ 2 a day *

The Nor 1252 has been withdrawn as most customers prefer the Nor 1251 class 1 calibrators. The following 1252 details are retained for information only

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.
* Our standard hire charges are based on a 4-day minimum period, details other options.