Model 325

UV Light Meter

Light Meter Features

  • Less than 1% Probe to Probe Repeatability.
  • Real Time Measurements.
  • Single Channel probe
  • Dual Channel Probe capability
  • Interchangeable Probes
  • Computer Interface
  • Cosine response probes
  • Measures MW/CM2, Peak MW/CM2, MJ/CM2(SP), Accumulated MJ/CM2 (total time-seconds) and Accumulated time (total seconds)
  • Calculates average value of MW/CM2, calculates MW/CM2 % uniformity and % deviation from center value
  • X10 range
  • Battery operates for approximately 18 hours before recharge
  • Charger operates from 100-240 VAC, 50-60 Hz with UL, CE, and TUV approvals

Comprehensive UV Light Measurement Instrument

The Model 325 built-in computer allows storing of sensor readings and calculations of average value and percent deviations. The two line display format allows for several readings at one time. The Model 325 measures MW/CM2, Peak MW/CM2, MJ/CM2 and time (single pulse) with average MW/CM2 and Peak MW/CM2.

The Model 325 has four modes of operation. 5 point MW (MW/CM2) and 5 point MJ (MJ/CM2) allow taking five readings in a fixed pattern and then displaying the average value and the +/-% uniformity as well as the +/-% deviation from the center value.

The rechargeable battery lasts for about 18 hours and the charger operates from 100-240 VAC, 50-60 Hz with UL, CE, and TUV approvals.

A variety of sensor packages can be used with the Model 325 at wavelengths from 220nm to 540nm and beyond.  Traceability to NIST is +/-3.0% with probe matching to +/-1.0%.

Light Meter Model 325 Specifications

Switch Functions:
  • Red button – ON (hold for one second) Off when displayed and MORE (data review)
  • Two black buttons for Mode, Reset SEL (select), Back (data review)
  • Channel A, Channel B switch
  • 2 Lines by 16 characters
  • MW/CM2 – 0.1 to 3999.9 (peak same)
  • MJ/CM2– .001 to 99,999
  • Time – .001 to 99,999 seconds
Mode Selection: MW/CM2
  • MW/CM2 and peak MW/CM2 continuous display
  • Single Pulse- MJ/CM2 Time (seconds)
  • Average MW/CM2 and Peak MW/CM2
  • Readings update automatically with new signal or manual reset (selectable)
5 Point MW
  • Five readings of MW/CM2in a *fixed pattern using a one second shutter opening (minimum) to read MW/CM2
  • Display of average MW/CM2 and +/-% uniformity
  • Display of +/-% deviation of each reading from center value
  • Display of all five values (3 digits)
5 Point MJ
  • Five readings of MJ/CM2 in a *fixed pattern~shutter control
  • Display of average MJ/CM2 and +/-% uniformity
  • Display of +/-% deviation from center reading
Display Pattern: G & R Labs - Model 320 Meter - Display Pattern
  • Built in rechargeable battery – 18 hours operation (approx.)
  • Recharge time 6 hours (unit off) – indicated by LED (goes dim and then off when fully charged)
  • Low battery indication on display next to ‘OFF’
  • Charger – 100-240 VAC, 50-60 Hz
  • Charger is UL, CE, TUV approved
Probe Wavelengths:
  • <220nm to 540nm and more>
  • 5.5 in. W (14 cm) x 7.4 in. L (18.8 cm) x 1.5 in. H (3.8 cm)
  • Steel Metal casing
  • 1.5 lbs. (681 grams)

G&R Labs Sensor Spectral Ranges

This graph accurately represents the spectral response of probes used today in the Microelectronic Industry. This graph includes the spectral response of the detector as well as the spectral response of the filter glass used in probes.