FAMILY 4938

1/4-INCH PRESSURE-FIELD MICROPHONE, EXTERNALLY POLARIZED

Pressure-field microphone for high-level and high-frequency measurements over a frequency range of 4 Hz to 70 kHz.

FAMILY 4938

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Pressure-field ¼-inch Microphone Type 4938 is designed for high-level and high-frequency measurements. The microphone is geared to withstand rough handling and high temperatures of up to 300°C (572°F).

High temperature measurements
High level measurements
High frequency measurements
Flush mounting

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Code	Sensitivity	Lower dynamic range	Minimum Temperature	Maximum Temperature	Minimum Temperature	Maximum Temperature
-4938-A-011-	1.4 mV/Pa	42 dB	-20 °C	80 °C	-4 °F	176 °F
-4938-D-011-	1.4 mV/Pa	42 dB	-20 °C	80 °C	-4 °F	176 °F
-4938-L-002-	1.4 mV/Pa	42 dB	-20 °C	80 °C	-4 °F	176 °F
-4938-W-001-	1.6 mV/Pa	30 dB	-40 °C	300 °C	-40 °F	572 °F

1/4'' Pressure-field Microphone Type 4938	Data Sheets	English
TEDS Microphones	Data Sheets	English

FAMILY 4938
Standard	IEC 61094
Sound field	Pressure field
Polarization	Classical
Sensitivity	1.4 mV/Pa, 1.6 mV/Pa
Lower frequency	4 Hz
Higher frequency	70 kHz
Lower dynamic range	42 dB, 30 dB
Higher dynamic range	172 dB
Diameter	1/4 inch
Venting	Side
Minimum Temperature	-20 °C, -40 °C
Maximum Temperature	80 °C, 300 °C
Minimum Temperature	-4 °F, -40 °F
Maximum Temperature	176 °F, 572 °F
Output signal (connectivity)	Passive

List of accessories available for all variants of this family

Product Code	Description
-2670-W-012-	Short 2670 Pre-Amplifier, / 10,0 m A
-4228---	Pistonphone calibrator, 250Hz, 124dB,Cla
-4231---	0,01d Calibrator, Class1, 94&114dB, 1kHz
DB-0264---	Adaptor 1/4" Mic use with UA-0033
DP-0775---	Adaptor 1/4" Mic for 4228/4231
UA-0033---	Electrostatic Actuator 1/2" for HBK Mic
UA-0035---	"Microphone Adaptor for 1/4"" microphone
UA-0122---	Adaptor 1/4"Mic to 1/2"Preamp,RightAngle
UA-0123---	Adaptor 1/4"Mic to 1/2"Preamp, Straight
WA-0371---	Adaptor 1/4" Mic to 1/2" Preamp, Short
UA-0033-W-001-	Electrostatic Actuators for Type 4180
WQ-1099---	Windscreen for 1/4"Mic, D 65mm, hole 5mm
WQ-1133---	Windscreen for 1/4"Array Mic,Ellipsoidal
UA-0385---	Nose Cone for 1/4" Mic
EU-4000---	1/4" Angle piece

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THIS MICROPHONE SET IS A COMBINATION OF:

The unit is assembled in a clean-room environment and sealed together, after which it is assigned one single type number and one single serial number. This means that the combined unit has better precision and long-time stability, and is handled as one complete unit.

The unit also contains TEDS, which means that information about the serial number, type and sensitivity is stored within it.

THE BENEFITS OF USING A MICROPHONE-PREAMPLIFIER COMBINATION ARE:

Better stability and precision. Because the unit is assembled in clean-room facilities, there is no contamination.
Ease of use. Your analyzer front-end and software will automatically detect the type number, serial number and sensitivity because of the built-in TEDS technology. There is no need to enter this manually for every channel.
Calibration integration. The TEDS technology means the microphone is automatically detected and identified by your data acquisition software, allowing it to be easily integrated with your calibration database.
Fewer errors. As your data acquisition software automatically knows the microphone type, serial number and sensitivity, manual inputs are greatly reduced – reducing human errors.

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