Page 14
Starting Points for IEC 61672-1:2002 Linearity Testing:
The following apply at 31.5Hz, 1kHz, 4kHz, and 8kHz: -
35-100 range: 74.0dB
55-120 range: 94.0dB
75-140 range: 114.0dB
Display:
Digital 1 x 8 alphanumeric, digit size 7mm x 5mm Liquid Crystal Display
Display Refresh Rate:
250ms
Detector Characteristics:
RMS and Peak
Warm up time:
< 2 minutes
Electrical Signal Input:
Electrical signals can be applied to the Castle Pocket range of sound level
meters by removing the acoustical microphone and replacing with a dummy
microphone having a series capacitor of 18pF ±2%. The BNC termination is
then used to interface with a suitable signal generator with an output
impedance of 600W at 1kHz.
Maximum Peak to Peak Electrical Signal Input For No Damage:
7 Volts
Upper Frequency for Periodic Acoustic Testing (IEC 61672-
3:2006):
4kHz
Windshield:
The effects of using the KG205 (60mm) windshield
31.5Hz 0.0 1kHz 0.2
63Hz 0.1 2kHz 0.2
125Hz 0.1 4kHz 0.7
250Hz 0.1 8kHz 0.0
500Hz 0.2
The meter conforms to the Standards quoted on Page 12 when fitted with
the windshield.
