Table of Contents
i-i
Table of Contents
Chapter 1
Introduction
1-1
About This Manual ........................................................1-1
Features........................................................................1-2
Unpacking and Inspection.............................................1-3
Accessories and Optional Equipment ...........................1-3
Chapter 2
Description
2-1
General Description ......................................................2-1
Connectors....................................................................2-3
Preamplifier Input................................................................................ 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 ...................................................................................... 2-5
External Power .................................................................................... 2-5
Battery Voltage.................................................................................... 2-5
Battery Compartment....................................................2-5
Chapter 3
Operation
3-1
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