CR:270 Series User Manual
Page 24
Specification
The range of measurement for Leq and SPL measurement with a standard assembly is:-
CR:272 & CR:274
32 to 140 dB(A)
50 to 140 dB(C)
CR:271 & CR:273
27 to 140dB(A)
47 to 140dB(C)
The range of measurement for Peak measurement with a standard assembly is:-
CR:272 & CR:274
60 to 143 dB(C)
CR:271 & CR:273
60 to 143dB(C)
Noise:
Signal to noise ratio normally better than 5dB at lower limit of
capsule sensitivity for quoted range typically 1microV(A) 8uv (C)
Input impedance:
Typically 1 Gigohm
Weighting networks:
'A' and 'C' for CR:272 and CR:271
'A' and 'Lin' for CR:274 & CR:273
Display type
3½ digit reflective LCD
Time weighting:
S (Slow) ; F (Fast) ; I (Impulse)
All to IEC 651 relevant Type
Display functions
Average Sound Level
Leq
Sound Level
SPL
True Peak
Peak
Max hold (S, F and I)
Octave Band Filter Selected for CR:274 & CR:273
Display flags
Overload (+)
Under-range (-)
Battery Low (BATT LOW)
Leq Full (:)
Power:
2 x 9V batteries 6F22 (40hr)
Operating Temperature -10 degrees C to +50 degrees C
Storage Temperature:
-20 degrees C to +60 degrees C
Dimensions: Length
230mm for CR:272 & CR:274
255mm for CR:271 & CR:273
Width 75mm
Depth
25mm
Weight:
0.5kg
Output:
3.5mm 'Stereo jack socket'
DC out on tip, 25 mV /dB
AC out on ring.
