Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Summary of Contents for Larson Davis 2221
-
Page 1: Model 2221
Model 2221 Microphone Preamplifier Power Supply Technical Reference Manual... - Page 2 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...
-
Page 3: Technical Support
Copyright Copyright 2009 by PCB Piezotronics, Inc. This manual is copyrighted, with all rights reserved. The manual may not be copied in whole or in part for any use without prior written consent of PCB Piezotronics, Inc. Disclaimer The following paragraph does not apply in any state or country where such statements are not agreeable with local law: Even though PCB Piezotronics, Inc. - Page 4 Record of Serial Number and Purchase Date Model 2221 Serial Number: ______________ Purchase Date: __________________ Recycling PCB Piezotronics, Inc. is an environmentally 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 or return the product to: PCB Piezotronics, Inc.
-
Page 5: Table Of Contents
External Power ..................2-5 Battery Voltage..................2-5 Battery Compartment............2-5 Chapter 3 Operation Powering the Model 2221 ..........3-1 Internal Battery Power..............3-1 Battery Replacement................3-1 External Battery or DC Power ............3-2 Cable Connections ............... 3-3 Signal Input Cable ................3-3... - Page 6 AC Signal Output Cable...............3-3 Operation ..............3-3 Switch On ..................3-3 Parameter Selection ..............3-3 Microphone Bias Voltage..............3-4 Frequency Weighting ................3-4 Gain ......................3-4 Vernier Adjustment ................3-4 Gain Adjustment for Best Measurement........3-5 Appendix A Technical Specifications Electrical Specifications ..........A-1 Input Impedance:................. A-1 Output Impedance ................
- Page 7 Length ....................A-5 Weight ..................A-6 Connectors ...................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 Europe..................A-7 United States................A-8 EMC Test Configurations .............A-8 i-iii Table of Contents...
- Page 8 List of Figures Introduction Description Model 2221................2-1 2221 Controls ................ 2-2 Operation Accessing Battery Compartment ........... 3-2 Technical Specifications A- 1 ii-i...
-
Page 9: Chapter 1 Introduction
Chapter 1 - Introduction: Orients the user to the • contents of this user manual and the features, functions and measurement capabilities of the Model 2221. It also includes instructions on unpacking the Model 2221. • Chapter 2 - Description: Provides a physical description of the Model 2221. -
Page 10: Features
Features The Larson Davis Model 2221 Microphone Power Supply has the following features: • Single Channel power and amplification for precision microphone preamplifiers • Internal batteries for portable operation • 0 and 200 microphone bias voltages • Selectable Flat (Z), A- and C-Weighting frequency responses •... -
Page 11: Unpacking And Inspection
Unpacking and Inspection Your Model 2221 has been shipped in protective packaging. Please verify the package contains the items listed below and retain the shipping container for safe shipment at a future date. Report any damage or shortage immediately to Larson Davis, Inc. - Page 12 CBL097 cable with 7-pin LEMO to BNC plug, 6’ long • PRA951-2 and PRM951-4 Current Sources permitting ™ accelerometers to be used with the Model 2221. • CAL200 and CAL250 Acoustic Calibrators • PSA021 230Vac to 9Vdc 500 mA Power Adaptor...
-
Page 13: Chapter 2 Description
LED indicators. Operational information is presented in Chapter 3 "Operation” on page 3-1 General Description The Model 2221 has a flat shape factor with top panel controls for optimal use on a table or desktop. FIGURE 2-1 Model 2221 Description... -
Page 14: Preamplifier Input
External Power Input Battery Voltage LED Indicators External Power LED Indicator Select Frequency Increase Weighting Gain Decrease Select Microphone Gain Bias Voltage Reset Overload On/Off Switch AC Signal Output Vernier Gain Adjustment Preamplifier Input FIGURE 2-2 2221 Controls General Description:... -
Page 15: Connectors
Connectors Preamplifier Input LEMO EPG.1B.307 7-pin Female Pin Connections Signal No Connection Signal Ground Microphone Polarization Voltage 0 or 200 Volts Signal Input No Connection Power Supply Positive Voltage + 18 Volts Power Supply Negative Voltage - 18 Volts Shell Connected to Case ground AC Output BNC Female... -
Page 16: Controls
Controls Power Side mounted toggle switch Back/On ( Forward/Off ( Ο Microphone Bias Voltage 200 or 0 Volt, selection indicated by illuminated LED Gain 0 to 40 dB in 10 dB steps, selection indicated by illuminated Note that there is also a 0 to 10 dB vernier gain (12 turn potentiometer) adjustment at the front of the case. -
Page 17: Led Indicators
Table 2-2. Battery Voltage (Volts) 5.5 to 6.5 6.5 to 7.5 7.5 to 8.5 8.5 to 11.3 Battery Compartment The Model 2221 is powered by six AA batteries. The battery compartment is accessed from the bottom by removing the LED Indicators:... - Page 18 door as shown below. The battery polarity is indicated in the bottom of the compartment. Battery Compartment:...
-
Page 19: Chapter 3 Operation
Internal Battery Power The Model 2221 is designed to use six AA batteries. This will provide 40 hours of continuous operation with the PRM902 Microphone Preamplifier. To insert the batteries, remove the battery compartment access door as shown in FIGURE 3-1. -
Page 20: External Battery Or Dc Power
5.5 Volts. External Battery or DC Power Note: The internal batteries need not The Model 2221 can be powered by an external 12 Volt be present to operate the Model battery or an AC/DC adaptor providing a voltage within the 2221 under external DC power. -
Page 21: Cable Connections
Switch On The power switch is on the left side of the case. Toggle it backward to switch on the Model 2221 and forward to switch it off. The Microphone Bias Voltage LED flashes for 40 seconds while the bias voltage stabilizes. -
Page 22: Microphone Bias Voltage
Microphone Bias Voltage The bias voltage should be set to The microphone bias voltage is either On, providing a zero when using a prepolarized highly stable level of 200 Vdc, or Off. Pressing the (electret) microphone and 200 V MICROPHONE BIAS key when using traditional... -
Page 23: Gain Adjustment For Best Measurement
If no further overloading is indicated, this should be a good setting. If using the Model 2221 for repeatable non-steady signals, such as recording the output during a machine cycle, it is recommended to make several test runs in order to find the highest gain setting which does not produce an overload during the complete measurement period. -
Page 24: Appendix A Technical Specifications
A P P E N D I X Technical Specifications The technical specifications in this chapter are subject to change without notice. Please refer to calibration and test results 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. -
Page 25: Maximum Output Current
Maximum Output Current 25 mA Overload Level (Input or Output) Positive and negative overload detection: ± 16.5 Volt Peak Output Slew Rate 10 Volt/μS Microphone Bias Voltage 0 and 200 Volt (± 0.25 V 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) -
Page 26: Output Noise
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) Output Noise The output noise is measured over the frequency range 20 Hz to 20 kHz, with the input shorted. -
Page 27: Indicators
Length, feet 14 Vpeak 4.2 Vpeak 1.4 Vpeak 1,000 9.5 kHz 31 kHz 92 kHz 2,000 4.7 kHz 15.6 kHz 47 kHz Indicators Overload Instantaneous (Blinking LED) Latched (Steady LED) - Reset on Keypad Output Signal LED illuminated for output signals > 45 mV Battery Level Battery Voltage (Volts) -
Page 28: Standby Performance
External 12 V battery or AC Adaptor External DC Voltage Range: 10.5 to 30 V Note: The Model 2221 will run on external DC voltage down to 6 Volts, but will draw power from whichever supply (external or internal battery) has the highest voltage. -
Page 29: Weight
Weight 425 grams (15 oz.) with six AA cells Connectors Input LEMO EPG.1B.307 7-pin Female Pin Connections Signal No Connection Signal Ground Microphone Polarization Voltage 0 or 200 Volts Signal Input No Connection Power Supply Positive Voltage + 18 Volts Power Supply Negative Voltage - 18 Volts Shell... -
Page 30: Environmental
<± 0.03 dB @ 1 kHz from 0 to 90% RH non-condensing at 40 °C (104 °F) Electromagnetic Compatibility Europe The Model 2221 complies with the European Community EMC Directive (2004/108/EC) and also the Low Voltage Safety Directive (2006/95/EC) by meeting the following standards: •... -
Page 31: United States
Conducted and Radiated 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 microphone facing the emissions/immunity antenna. - Page 32 Index Accessories ..........................1-3 Battery Compartment ........................2-5 External..........................3-2 Internal..........................3-1 Replacement ......................... 3-1 Cable Connections AC Signal Output ......................... 3-3 Signal Input........................... 3-3 Connectors ........................... 2-3 AC Output..........................2-3 External DC Power ....................... 2-3 Preamplifier Input......................... 2-3 Controls............................2-4 Frequency Weighting......................
- Page 33 Indicators ..........................A-3,A-4 Inspection............................. 1-3 LED Indicators..........................2-5 Battery Voltage........................2-5 External Power........................2-5 Overload ..........................2-5 Signal Present ........................2-5 Microphone Bias Voltage........................2-4,3-4 Overload Flashing..........................2-5 Reset ............................. 2-4 Steady ........................... 2-5 Parameter Selection ........................3-3 Frequency Weighting......................3-4 Gain............................
- Page 34 Technical Support ......................... i-2 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...
Need help?
Do you have a question about the 2221 and is the answer not in the manual?
Questions and answers