Optimus Yellow

  • Class 1 & Class 2
  • Simple noise measurement
  • Fire & emergency alarm testing
  • Easy to use
  • Optional data logging


Optimus Yellow Sound Level Meter Specifications

Applicable Standards
IEC 61672-1:2002 Class 1 or Class 2 Group X
IEC 60651:2001 Type 1 I or Type 2 I
ANSI S1.4 -1983 (R2006)

Class 1 Instruments MK:224 pre-polarized
Class 2 Instruments MK:216 pre-polarized

Microphone Preamplifier
MV:200 Removable Preamplifier

Total Measurement Range:
20dB to 140dB RMS Single Range
Noise Floor: <18dB(A) Class 1, <21dB(A) Class 2

Frequency Weightings
RMS: A, C, & Z Measured Simultaneously

Time Weightings
Fast, Slow & Impulse Measured Simultaneously

High resolution OLED display with ambient light sensor & illuminated keypad

4GB Expandable with up to 10,000 measurements stored (B Version)

Time History Data Rates (Global settings)
10ms, 62.5ms, 125ms, 250ms, 1/2 sec, 1 sec, 2 sec (User selectable)

VoiceTag Audio Recording (B Versions)
30 seconds of audio recording with each measurement

283mm x 65mm x 30mm


4 x AA Alkaline

Battery life
Typically 12 hours with Alkaline AA
Typically 20 hours with Lithium AA Non-Rechargeable
Battery life is dependent upon the battery type and quality & screen brightness

External Power
5v via USB Socket from PC or Power Supply
5v-15v via MultiIO socket

Tripod Mount
1/4” Whitworth socket

USB Type B to PC
Multi-pin IO for external power
AC Output via 3.5mm Jack Socket & ZL:826 Cable
DC Output via Multi-IO Socket & ZL:825 Cable

Material: High Impact ABS-PC with soft touch back & keypad

Temperature Operating -10°C to +50°C
Storage -20°C to +60°C
Humidity Up to 95% RH Non Condensing

Electromagnetic performance
IEC 61672-1:2002 & IEC 61672-2:2003
Except where modified by EN 61000-6-1:2007 & EN 61000-6-1:2007

Language options
English, French, German, Spanish as standard
Other language options may be available

Software Support
NoiseTools Download, Configuration & Analysis software supplied as standard. Compatible with Microsoft Windows XP, Vista & 7 (32bit & 64bit)

NoiseTools is supplied free from any licensing or installation restrictions.

Measurement Functions

CR:152A & CR:151A
Displayed Functions
Measurement Run Time

CR:152B & CR:151B
Displayed Functions
Measurement Run Time

Stored Functions
LXYMax & Time History of LXYMax

where x=A ,C ,Z; y= F, S, I

All values, figures and performance statements are typical and are subject to change without notice.

1. For details of the displayed and stored parameters, please refer to the optimus user manual for full specifications.

All specifications, features and values are typical and are subject to change without notice.

Cirrus Research plc