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Model 2221 

Microphone Preamplifier 
Power Supply

Technical Reference Manual

Larson Davis, a division of PCB Piezotronics, Inc.

1681 West 820 North

Provo, UT 84601-1341

24 Hour Hotline: (716) 926-8243

Toll Free (US): (888) 258-3222

www.LarsonDavis.com

I2221.01 Rev G

Summary of Contents for 2221

Page 1: ...Model 2221 Microphone Preamplifier Power Supply Technical Reference Manual...

Page 2: ...mplifier Power Supply Technical Reference Manual Larson Davis a division of PCB Piezotronics Inc 1681 West 820 North Provo UT 84601 1341 24 Hour Hotline 716 926 8243 Toll Free US 888 258 3222 www Lars...

Page 3: ...d should not be construed as a commitment or representation by PCB Piezotronics Inc This publication may contain inaccuracies or typographical errors PCB Piezotronics Inc will periodically update the...

Page 4: ...nvironmentally friendly organization and encourages our customers to be environmentally conscious When this product reaches its end of life please recycle the product through a local recycling center...

Page 5: ...nput 2 3 AC Output 2 3 External DC Power Input 2 3 Controls 2 4 Power 2 4 Microphone Bias Voltage 2 4 Gain 2 4 Frequency Weighting 2 4 Overload Reset 2 4 LED Indicators 2 5 Overload 2 5 Signal Present...

Page 6: ...put Impedance A 1 Output Impedance A 1 Preamplifier Supply A 1 Maximum Input Level A 1 Maximum Output Current A 2 Overload Level Input or Output A 2 Output Slew Rate A 2 Microphone Bias Voltage A 2 Ga...

Page 7: ...tors A 6 Input A 6 Output A 6 Environmental A 7 Operating Temperature Range A 7 Operating Humidity Range A 7 Temperature Sensitivity A 7 Humidity Sensitivity A 7 Electromagnetic Compatibility A 7 Euro...

Page 8: ...ii i List of Figures Introduction 1 1 Description 2 1 Model 2221 2 1 2221 Controls 2 2 Operation 3 1 Accessing Battery Compartment 3 2 Technical Specifications A 1...

Page 9: ...external DC voltage It is characterized by low noise level and distortion and the ability to drive very long cables input and output About This Manual This manual has 3 chapters and 1 appendix coverin...

Page 10: ...in range Last settings are saved even when not powered Both instantaneous and latched overload indications Output signal level indicating LED Internal battery voltage LEDs External power LED Ability t...

Page 11: ...strument and the purchase date You may be asked to give this information in future communications with Larson Davis Accessories and Optional Equipment The Model 2221 delivered with the following stand...

Page 12: ...7 pin LEMO the XXX indicates length in feet CBL097 cable with 7 pin LEMO to BNC plug 6 long PRA951 2 and PRM951 4 Current Sources permitting ICP accelerometers to be used with the Model 2221 CAL200 an...

Page 13: ...f the front panel keys and their functions input and output connectors instrument controls and the functions of the LED indicators Operational information is presented in Chapter 3 Operation on page 3...

Page 14: ...ff Switch Increase Gain Decrease Gain Select Microphone Bias Voltage Reset Overload AC Signal Output Preamplifier Input External Power Input Select Frequency External Power LED Indicator Weighting Bat...

Page 15: ...Input 2 5 x 5 5 mm Coaxial Connector center positive External DC voltage range 10 5 to 30 V Pin Signal 1 No Connection 2 Signal Ground 3 Microphone Polarization Voltage 0 or 200 Volts 4 Signal Input...

Page 16: ...uminated LED Gain 0 to 40 dB in 10 dB steps selection indicated by illuminated LED Note that there is also a 0 to 10 dB vernier gain 12 turn potentiometer adjustment at the front of the case Frequency...

Page 17: ...signal level in a manner approximately proportional to the log of the voltage External Power The presence of an external voltage 10 5 30 Vdc is indicated by the illuminated EXTERNAL POWER LED Battery...

Page 18: ...2 6 BatteryCompartment door as shown below The battery polarity is indicated in the bottom of the compartment...

Page 19: ...y No internal or external power is used when the instrument is switched off Internal Battery Power The Model 2221 is designed to use six AA batteries This will provide 40 hours of continuous operation...

Page 20: ...e present to operate the Model 2221 under external DC power The Model 2221 can be powered by an external 12 Volt battery or an AC DC adaptor providing a voltage within the range 10 5 to 30 Vdc Note Th...

Page 21: ...r collar between the thumb and forefinger and pull AC Signal Output Cable Connect the signal output cable to the BNC connector on the front of the case Operation Switch On The power switch is on the l...

Page 22: ...g is selected by pressing the WEIGHT key Repeated presses will move the selection in the sequence Z Flat C and A as indicated by the illuminated LED to the left of the key The characteristics of these...

Page 23: ...ease the gain until an overload is indicated reduce the gain by 10 dB and reset the latching overload If no further overloading is indicated this should be a good setting If using the Model 2221 for r...

Page 24: ...for data on a specific unit Electrical Specifications All values are given at 20 C 50 R H 12 V external supply 3 m 10 cable and a direct input from a 50 Ohm generator unless otherwise specified Input...

Page 25: ...Note LED flashes for 40 seconds while microphone bias voltage is stabilizing Gain Settings 0 to 40 dB in 10 dB steps 0 to 11 dB vernier gain 12 turn potentiometer Error with vernier fully counter cloc...

Page 26: ...itance of 30 pF ft A Weight 63 Hz to 20 kHz 0 3 dB 10 Hz to 50 Hz 0 7 dB C Weight 25 Hz to 20 kHz 0 3 dB 10 Hz to 20 Hz 0 6 dB Flat Z Weight 10 Hz to 100 kHz 0 2 dB 1 Hz to 150 kHz 3 dB Gain Flat Z We...

Page 27: ...output signals 45 mV Battery Level Power Supply Battery Power Six AA batteries 40 hours of continuous operation with the PRM902 Microphone Preamplifier 1 000 9 5 kHz 31 kHz 92 kHz 2 000 4 7 kHz 15 6...

Page 28: ...ernal DC voltage down to 6 Volts but will draw power from whichever supply external or internal battery has the highest voltage Current 65 mA 12 V with PRM902 Microphone Preamplifier 2 5 x 5 5 mm coax...

Page 29: ...07 7 pin Female Pin Connections Output BNC Female Pin Signal 1 No Connection 2 Signal Ground 3 Microphone Polarization Voltage 0 or 200 Volts 4 Signal Input 5 No Connection 6 Power Supply Positive Vol...

Page 30: ...y EMC Directive 2004 108 EC and also the Low Voltage Safety Directive 2006 95 EC by meeting the following standards IEC61326 1 2005 Electrical equipment for measurement control and laboratory use EMC...

Page 31: ...diated Emissions meet Class B limits EMC Test Configurations The Model 2221 was tested with 40 dB Gain Z weight and with the microphone bias set to 200V The reference orientation is with the microphon...

Page 32: ...ectors 2 3 AC Output 2 3 External DC Power 2 3 Preamplifier Input 2 3 Controls 2 4 Frequency Weighting 2 4 Gain 2 4 Microphone Bias Voltage 2 4 Overload Reset 2 4 Power 2 4 Customer Service i 2 E Elec...

Page 33: ...ias Voltage 2 4 3 4 O Overload Flashing 2 5 Reset 2 4 Steady 2 5 P Parameter Selection 3 3 Frequency Weighting 3 4 Gain 3 4 Microphone Bias Voltage 3 4 Power 3 1 External AC DC Adaptor 3 2 External Ba...

Page 34: ...T Technical Support i 2 U Unpacking 1 3...

Page 35: ...Total Customer Satisfaction Guaranteed 3425 Walden Avenue Depew NY USA 14043 Phone 716 926 8243 Toll Free 888 258 3222 LarsonDavis com FAX 716 926 8215...

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