Model 90 Quantifier Sound Level Meter
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Appendix 1 Specifications
Instrument Versions
MODEL 91 Class 1
MODEL 92 Class 2
MODEL 93 Class 1 with 1:1 Octave Band Filters
MODEL 94 Class 2 with 1:1 Octave Band Filters
MODEL 95 Class 1 with 1:1 & 1:3 Octave Band Filters
MODEL 96 Class 2 with 1:1 & 1:3 Octave Band Filters
Applicable Standards
Sound Level Meter
IEC 61672-1:2002 Class 1 or 2 Group X
IEC 60651:1979 Class 1 I or Class 2 I
IEC 60804:1985 Class 1 or Class 2
ANSI S1.4 with NK:70 Random Incidence Adaptor Fitted
1:1 & 1:3 Octave Band Filters (where fitted)
IEC 61260 Class 1
Microphone
Class 1
MK:224 pre-polarized Free-field ½" Condenser
Class 2
MK:216 pre-polarized Free-field ½" Condenser
Random Incidence to ANSI S1.4 with NK:70 Adaptor
Capacitance
18pF
Microphone Preamplifier
Class 1
MV:200D Removable Preamplifier
Class 2
MV:200D Integral Preamplifier
Extension cables
MEC2 2m
MEC5 5m
MEC10 10m
MEC15 15m
MEC20 20m
MEC25 25m
Time Weightings
‘F‘ (Fast)
to IEC 61672-1:2002 Class 1 or 2 Group X
‘S' (Slow)
to IEC 61672-1:2002 Class 1 or 2 Group X
‘I' (Impulse)
to IEC 61672-1:2002 Class 1 or 2 Group X
Frequency Weightings
Channel 1
‘A', ‘C' or ‘Z'
Channel 2
‘C' for Peak
Z weighting is a flat frequency response of 8Hz – 20kHz ±1.5dB excluding microphone
response. When either 1:1 or 1:3 Octave Band filters are selected the ‘Z' weighting is
used.
