Model CAL200
Precision Acoustic Calibrator

IEC 60942 Class 1 Handheld Sound Level Calibrator for ½” microphones at 1000 Hz Used for Sound Level Meters and Other Sound Measuring Equipment

The Larson Davis CAL200 Sound Level Calibrator is a battery operated precision microphone calibrator used for the calibration of sound level meters and other sound measurement equipment. It can provide an output level of either 94.0 or 114.0 dB (switch-selectable) at a frequency of 1 kHz.

It has been designed for both field and laboratory use and the accuracy has been calibrated to a reference traceable to the National Institute of Standards and Technology (NIST).

The Larson Davis CAL200 features a stable sound pressure independent of the battery condition. In addition, the Larson Davis CAL200 will turn off automatically to preserve battery and guarantee a stable output.


  •   Output level: 94 or 114 dB
  •   Output frequency: 1 kHz
  •   1/2” microphone opening
  •   IEC 60942-1:2003 Class 1 compliant
  •   Internal battery
  •   Output level independent of battery condition
  •   Adaptors: 1/4”, 3/8”, 1/8” microphones


  •   Field calibration or laboratory

Calibration of:

  •   Sound level meters
  •   Noise dosimeters
  •   Noise monitoring stations

Finally…. A Humidity Generator that Stabilizes in less than 5 minutes, has the Capacity to Calibrate 12 Probes and can Complete a 3 Point RH Calibration of Chart Recorders with Embedded Sensors in 60 minutes…Automatically!!!


The M2000SP-XR Humidity Generator


One System…Three Functions


Calibration of Instruments Over Full Operational Range


The field proven M2000SP-XR with new solid state electronics for high accuracy and performance over the full operating range of humidity and temperature. The temperature compensated control probe provM200SP-XR_Humidity_Generatorides
higher accuracy over the range of

measurement. Newly designed electronics is incorporated within the heat/cool  circuitry and a more efficient peltier mechanism, has been incorporated for faster response and temperature stability. The number of ports in the chamber door has been increased to accept 5 probes with diameters of 10mm, 12mm, 15mm and 18mm. NVLAP Accredited calibration of control probe. System tested for performance at ICH guideline parameters to meet accuracy and long term stability requirements. Typical response time is 3 minutes for 70%RH step change.

Production and Volume Calibrations at Ambient Temperature


The chamber size of the M2000SP standard system is 2 liters. For calibrations of multiple data loggers or sensors the chamber capacity must be increased. The M2000SP-XR, using the 12 port external chamber, provides the increased calibration capabilities through the use of a chamber with internal dimensions of 250mm x 200mm x 100mm (h x w x d). Nine (9) horizontal ports have sufficient separation to prevent interference and to maximize number of transmitters for insertion within the chamber.  Three (3) top ports are for instruments with long probes (250mm) or reference standards to verify internal readings.  Clear chamber door for visual observation of instruments with digital displays.

Calibration of Chart Recorders with Embedded Sensors Using Programmed Procedures
For fast, accurate calibration of battery operated chart recorders having the RH/T sensors embedded within the recorder housing. The internal blower of the M2000SP has been modified for a more efficient  air flow, both within the internal chamber and the external chambers. The large external chamber has  internal dimensions of 300mm x 250mm x 150mm (h x w x d).  Accurate RH calibrations over the range of 10-90%RH, at ambient temperature, can be done more quickly than when using larger chambers. A typical 3 point RH calibration can be done in less than 1 hour after temperature has stabilization. The internal chamber conditions are verified using a reference instrument calibrated by an NVLAP Accredited laboratory according to ISO/IEC guidelines and 17025 procedures. Through the use of pre-programmed calibration procedures , the required calibration cycle can be done automatically.