Casella CEL CEL-193 User Manual
Page 4
Casella USA
17 Old Nashua Rd #15
Amherst, NH 03031 USA
1 Introduction
The CEL-193 is a full specification Precision Impulse Integrating Sound Level Meter conforming to the
International Standard IEC 179/A (IEC 651 Cons. Revision IEC 179/123 Type 1) and British Standard BS
4197. It also meets all the requirements of the proposed International Standard for Integrating Sound Level
Meters in the peak category. The instrument is, therefore, suited to the measurement of noise having a high
impulse content and because of its inherent accuracy will find extensive applications in connection with
statutory regulations.
The instrument embodies all the facilities expected of a traditional sound level meter with the addition of a
60dB linear scale and a considerable reduction in physical size. It has also been designed to accept the CEL-
196 Automatic Third Octave Filter, the CEL-178 Octave Filter and the CEL-3025 Vibration Attachment. The
instrument also incorporates a new type of maximum hold circuit which operates on a principle of
continuous digitization of the signal. It can, therefore, hold the maximum level indefinitely without the signal
decay which so often introduced significant errors in traditional instruments which used analogue hold
circuits. An equivalent continuous level calculation facility is also provided to give the answers in terms of
either Leq, LAX or Ltm. The instrument is, therefore, providing simultaneously the three most popular
acoustic measurements – SPL, Lmax and Leq – and these may be selected for display at any time.
This manual primarily refers to the CEL193. There is an alternative version which is fitted with a range
encoder for use in conjunction with the CEL-202 Digital Display Unit that is designated CEL-193/2. This
version does not have the remote pause facility and cannot, therefore, be used in conjunction with the CEL-
3300/ SLM Handset but is in all other respects identical to the basic CEL-193. Any other changes relative to
individual instruments are noted in the post production developments section of this manual.
1 Schedule of Parts
The description CEL-193 Precision Impulse Integrating Sound Level Meter Complete refers to the items
listed below and on receipt it should be checked to ensure that all items are as listed:
CEL-193
Precision Impulse Integrating Sound Level Meter
CEL-2980
Microphone Preamplifier
CEL-186/2F
Precision Measurement Microphone *
D 3426
Attaché Case
RS 1
Screwdriver
6F22 Batteries 9V (2 off)
HB 193/1079
Handbook
In addition there are a number of optional accessory items for use with the instrument such as an extension
cable, windshield, tripod, etc.. and these, will be shown separately on delivery notes, etc.
2 Preparing the Instrument for Use
2.1 Connection of batteries and microphone
The battery compartment is accessible when the rear cover of the instrument has been removed. This is
achieved by first ensuring that the unit is switched off and then removing the single slotted securing screw
and lifting the cover away from the top before disengaging the slot at the base of the cover. The two 6F22,
or equivalent batteries should be connected to the flying leads and placed in the battery compartment. It is
important to ensure that the battery leads are not trapped between the battery and the case in order that
the cover locates correctly. The rear cover may then
*In order to comply with the ANSI S1.4 Type 1 Standard the instrument must be specified with the CEL-
186/2R Random Incidence Microphone.
Page 4 of 20
Tel: (800) 366-2966
www.casellausa.com
2 Mar 2009
Fax: (603) 672-8053