CASELLA CEL CEL-450 Handbook page 66

Specification
Remove the batteries when the instrument is to be out of
service for some time. A built in lithium battery will maintain
stored data and setup information while the instrument is
switched off.
External DC Via 2.1 mm Power Connector: 9 to 14 VDC
at typically 150 mA with 1000 mA inrush current.
AC Output:
Approximately 0.5 VRMS via "AC Line Out" jack socket.
Full scale output corresponds to either 94 or 114 dB, with 22 kW
minimum load impedance.
This output is suitable for DAT recorders, tape recorders, PC wav
file recording and headphone applications.
AC Input:
10 VRMS maximum via "AC Line In" jack socket or via a
CEL-516 Dummy Microphone. Maximum source impedance is
100 kW.
This input is suitable for inserting direct-line signals from DAT or
tape recorders for analysis.
Optional DC Output:
0 to 2 VDC corresponds with 0 to 140 dB, with 2 kW output
impedance.
Internal Clock:
Date and time accuracy better than 2 seconds per day.
Electromagnetic Compatibility:
The instrumentation is designed and tested to comply with the
following EMC and ESD Standards.
IEC 61000-4-2 Testing and Measuring Techniques - Electrostatic
Discharge Immunity Tests,
IEC 61000-4-3 Electromagnetic compatibility (EMC) - Radiated
Electromagnetic Field Tests.
IEC 61000-4-6 Electromagnetic compatibility (EMC) - Immunity to
Conducted Disturbances induced by Radio Frequency Fields.
Tested at 10 V/m or greater.
Page 66 - CEL-450/490 Operators Handbook