Fully compliant with the International Electrotechnical AssociationIEC 61672-2002 CLASS 1

JJG 188 1level

• environmental condition :temperature 23°C± 5°C,humidity< 80%
• display :Double row display,Maximum display1999
• Display updates :per second1order
• Compliant with standards

IEC 61672-1：2002 Class1
JJG-188-2002 Class 1
CNS NO.7129
IEC60651 : 1979 TYPE 1
IEC60804 : 2000 TYPE 1
ANSI S1.4 : 1983 Type1

• microphone : 1/2Inch polarized condenser microphone
• measuring items : Lxyp ,Lxmax ,Lxmin ,Lxeq ,LAE ,Lcpeak ,RT60
• measuring range :

30dBto130dB (A)

35dBto130dB (C)

40dBto130dB (Z)

• dynamic range : 1 00 dB
• Integral time setting :hand movement, tensecond , onedivide , fivedivide , tendivide , thirtydivide , onehour , eighthour , sixteenhour , twenty-fourhour
• Internal memory capacity : 24C512 × 4 : Maximum number of records>37000
• Micro SDblock : Micro SDMaximum support for cards4GB；37000Pen data memory space approximately300KB
• Maximum peak valueCWeighted measurement range : 70~133 dB
• time weight :Quickly（Fast）,Slow speed（Slow）,Pulse sound(IMPULSE) ,Peak value（PEAK）Time weighted measurement
• frequency weighting : A/C/Z
• Frequency range :

31.5Hz~8KHz(ST-107)

20Hz~8KHz(ST-107S)

20Hz~16KHz(ST-109)

• DCoutput : 2Vdc/130dB
• ACoutput : 2Vrms/130dB
• Start Time :＜10 Second
• power supply : 30hour(AA,3Alkaline battery4The grain)
• ACchangeDCtransformer :INPUT VOLTAGEAC 100V~240V ;Output voltageDC 6V~9V/500mA
• size : 285(long) x 90(wide) x 39(tall) mm