​Optimus Yellow Sound Level Meters

  • Measures everything you need simultaneously to save time
  • No complicated setup - just switch on, calibrate and start
  • Large OLED display so the data is easy to read
  • Lightweight, ergonomic design for ease of use
  • High Performance guaranteed

​The Ideal Solution for Simple Noise Measurements

Optimus Yellow Sound Level Meters
The Optimus yellow instruments are a range of state-of-the-art sound level meters that have been designed to meet the very latest standards for noise measurement instruments.
It has been purposed-designed for applications where only basic noise data is required, such as Sound Level (SPL) or Maximum Sound Level (Lmax). These applications include fire alarm testing, machinery servicing and noise ordinance enforcement.

Why Choose Optimus Yellow?

  • Backed by 15 Year "No Quibble" Warranty for your peace of mind
  • Product training available at a low cost
  • High Performance to Class 1 or Class 2 Standard
  • Quick, Simple and easy to operate
  • Fast, Slow & Impulse Time Weightings
  • dB(A), dB(C) and dB(Z) Frequency Weightings
  • VoiceTag™ voice note recording
  • AuditStore™ measurement verification
  • High resolution colour OLED display and back-lit keypad
  • Measure up to 140dB(A) and 143dB(C) Peak with a single 120dB measurement range
  • Pause & Back Erase as standard
  • 4GB memory with the option of 32GB
  • Long battery life

Downloading Your Data is Simple

If you need the data logging version of the Optimus Yellow, we'll include the NoiseTools noise analysis software so you can keep a record of your measurements. View the full specifications on the product table below.

You can upgrade this instrument to an Optimus Red or Optimus Green at any time, future-proofing your investment. 

Which Optimus Yellow is right for you?
There are 4 versions of the Optimus Yellow Sound Level Meters, 2 with Class 2 performance and 2 with Class 1 performance.
The table below shows the different versions and options available with each instrument.
You can also use our interactive Optimus Product Selector to find the best instrument for you.

Data Sheet & Product Information

Specifications - Technical Information

​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), ANSI S1.43 - 1997 (R2007)
ANSI S1.25:1991
Microphone
Class 1 MK:224 pre-polarized, Class 2 MK:216 pre-polarized
Microphone Preamplifier
MV:200 Removable Preamplifier (All versions)
Total Measurement Range:
20dB to 140dB RMS Single Range
Noise Floor: <18dB(A) Class 1, <21dB(A) Class 2
Frequency Weightings
RMS & Peak : A, C, & Z Measured Simultaneously
Time Weightings
Fast, Slow & Impulse Measured Simultaneously
Display
High resolution OLED display. Ambient light sensor & illuminated keypad
Memory
4GB (B Version), 32GB factory fit option
AuditStore
Measurement verification data stored in secure memory
Time History Data Rates (Global settings)
10ms, 62.5ms, 125ms, 250ms, 1/2 sec, 1 sec, 2 sec (User selectable)
VoiceTag Audio Recording (B Version)
Up to 30 seconds of audio notes with each measurement
Measurement control
Pause & Back Erase with user selectable duration
Dimensions
Size: 283mm x 65mm x 30mm
Weight: 300gms/10oz
Batteries
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, quality & screen brightness
Connections
USB Type B to PC
AC & DC Output via ZL:174 (2 x Phono, 1m)
Multi-pin IO for external power via ZL:171 cable (2.1mm socket)
External Power: 5v-15v via MultiIO socket via ZL:171 cable (2.1mm socket)
Tripod Mount
1/4" Whitworth socket
Case
Material: High Impact ABS-PC with soft touch back & keypad
Environmental
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. Other language options may be available
Software Support
NoiseTools Download, Configuration & Analysis software supplied as standard. Compatible with Microsoft Windows XP, Vista, 7 & 8 (32bit & 64bit)
Measurement Functions
CR:152A & CR:151A
Displayed Functions
LXY, LXYMax, LXYMin
Measurement Run Time
CR:152B & CR:151B
Displayed Functions
LXY, LXYMax, LXYMin
Measurement Run Time
Stored Functions
LXYMax & Time History of LXYMax
Time & Date of Measurement Start
where x=A ,C ,Z; y= F, S, I
Other functions may calculated by the NoiseTools software and displayed on download.