CR:270 Series User Manual
Page 22
IEC 1260 7c
Not applicable
IEC 1260 7d
The nominal midband frequencies for the filters are known as 31.5Hz ,63Hz, 125Hz,
250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz, 16000Hz.
IEC 1260 7e
The filters are derived from the 'Base-two' formula. Exact centre frequencies are
31,25Hz, 62.50Hz, 125.00Hz, 250.00Hz, 500.00Hz, 1000.0Hz, 2000,0Hz, 4000.0Hz,
8000.0Hz & 16000Hz.
IEC 1260 7f
The reference level range is the centre range (50dB to 110dB).
IEC 1260 7g
The reference input signal level is 94dB
IEC 1260 7h
The reference attenuation is 0dB
IEC 1260 7i
The linear operating range is: CR:274
60 to 110dB ±0.5dB
CR:273
50 to 110dB ±0.5dB
IEC 1260 7j
The range should be selected such that neither the underrange or overload flags occur
during measurement.
IEC 1260 7k
Not applicable
IEC 1260 7l
The flat frequency response from microphone to display is 15Hz-12kHz ±0.15dB,13Hz-
14kHz ±0.3dB,10Hz-18kHz ±0.5dB. The individual filters are tailored to compensate for
this frequency response.
IEC 1260 7m
The filter is not directly accessible.
IEC 1260 7n
Not applicable
IEC 1260 7o
The instrument will operate from -10 C to +50 C. The instrument may incur damage if
exposed to temperatures below -20 C or above 60 C.
IEC 1260 7p
The unit meets the requirements set out in IEC651
IEC 1260 7q
The unit meets the requirements set out in IEC651
IEC 1260 7r
The unit meets the requirements set out in IEC651
