Casella CEL CEL-250 User Manual
Polarisation voltage:
None.
Capacitance at 1 kHz:
17 pF.
Operating temperature range:
-50 to +100
Temperature coefficient:
0.01 dB/
Static pressure coefficient:
-1 x 10
o
-5
dB/Pa.
o
C.
C
Diameter with dustcap:
13.2 mm +0.05 mm.
Diameter without dustcap:
12.7 mm +0.05 mm.
Length:
16.4 mm.
Weight:
9g.
CEL-250 Electret Microphone (Free-field)
060161
Issue: 3
November 2000
This microphone (which may also be identified as the mechanically
identical MK 250) is suitable for use with the CEL-593, CEL-573,
CEL-553, CEL-440, CEL-480, CEL-268 and CEL-262 measuring
instruments which have arrangements to suppress or disconnect the
200 V polarization supply required by standard condenser microphones.
The microphone can be used with other sound level meters that meet
the measurement requirements of IEC 651 Type 1, provided the
polarization voltage has been disconnected.
Warning !
Use this microphone with sound level meters
such as the CEL-266, CEL-275, CEL-414 and
CEL-493* ONLY WHEN connected via a
C6601/X Preamplifier Extension Cable which
has no polarization voltage connection.
Preamplifier thread:
11.7 mm 60 UNS.
Dustcap thread:
12.7 mm 60 UNS.
CEL instrumentation is designed, manufactured, and serviced by CASELLA CEL LIMITED
Regent House, Wolseley, Kempston, Bedford, MK42 7JY, United Kingdom.
Phone: (44) 1234 844100 Fax: (44) 1234 841490, e-mail: info@casella.co.uk
17 Old Nashua Road #15, Amherst, NH 03031, U.S.A.
Phone: (1) 603 672 0031 Fax: (1) 603 672 8053 e-mail: cel_sales@compuserve.com
Note*: The arrangement must be re-calibrated acoustically when the CEL-493 is used
with the 10 dB Attenuator Pad supplied.
Technical Information
Type:
Frequency range:
Sensitivity:
Maximum sound pressure level:
1
⁄2" electret microphone for free-field measurement.
3.5 Hz to 20 kHz ±2 dB.
50 mV/Pa.
146 dB.
CEL-250 Information - Page 1 of 2CEL-250 Information - Page 2 of 2
Polarisation voltage:
None.
Capacitance at 1 kHz:
17 pF.
Operating temperature range:
-50 to +100
Temperature coefficient:
0.01 dB/
Static pressure coefficient:
-1 x 10
o
-5
dB/Pa.
o
C.
C
Diameter with dustcap:
13.2 mm +0.05 mm.
Diameter without dustcap:
12.7 mm +0.05 mm.
Length:
16.4 mm.
Weight:
9g.
CEL-250 Electret Microphone (Free-field)
060161
Issue: 3
November 2000
This microphone (which may also be identified as the mechanically
identical MK 250) is suitable for use with the CEL-593, CEL-573,
CEL-553, CEL-440, CEL-480, CEL-268 and CEL-262 measuring
instruments which have arrangements to suppress or disconnect the
200 V polarization supply required by standard condenser microphones.
The microphone can be used with other sound level meters that meet
the measurement requirements of IEC 651 Type 1, provided the
polarization voltage has been disconnected.
Warning !
Use this microphone with sound level meters
such as the CEL-266, CEL-275, CEL-414 and
CEL-493* ONLY WHEN connected via a
C6601/X Preamplifier Extension Cable which
has no polarization voltage connection.
Preamplifier thread:
11.7 mm 60 UNS.
Dustcap thread:
12.7 mm 60 UNS.
CEL instrumentation is designed, manufactured, and serviced by CASELLA CEL LIMITED
Regent House, Wolseley, Kempston, Bedford, MK42 7JY, United Kingdom.
Phone: (44) 1234 844100 Fax: (44) 1234 841490, e-mail: info@casella.co.uk
17 Old Nashua Road #15, Amherst, NH 03031, U.S.A.
Phone: (1) 603 672 0031 Fax: (1) 603 672 8053 e-mail: cel_sales@compuserve.com
Note*: The arrangement must be re-calibrated acoustically when the CEL-493 is used
with the 10 dB Attenuator Pad supplied.
Technical Information
Type:
Frequency range:
Sensitivity:
Maximum sound pressure level:
1
⁄2" electret microphone for free-field measurement.
3.5 Hz to 20 kHz ±2 dB.
50 mV/Pa.
146 dB.
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