Gentec-EO QE and XLE4 - Manual (Page 24)

QE Series Joulemeter Instruction Manual Version 3.0 April 2014 24
2 OPERATING INSTRUCTIONS
2.1 When used with compatible monitor
Refer to the respective monitor’s instruction manual for further information.
2.1.1 General Instructions
1- tall the joulemeter on its optical stand.
190 2-
Connect the joulemeter to the Gentec-EO laser energy monitor (see Fig. 2-1).
NOTE: The parameters programmed in the DB- 15 “Smart Interface” are for a 1 M 
/ 30 pfd
load impedance.
3- Remove the detector's ’rotective cover, when applicable.
4- Put the joulemeter head into the laser beam path (laser beam must be contained within
the aperture).
CAUTION: Be careful not to exceed the maximum levels and densities of, energy, peak
power and average power, stated in the specifications pages. The use of a
damage test target is strongly recommended.
WARNING: 1- At maximum average powers QE Series joulemeter bodies can reach 60°C
and can represent a burn hazard if handled with bare hands.
2- A diffuse back reflection of ~ 30% is present from the joulemeter’s optical
absorber.
NOTE: As with all large aperture pyroelectric devices, these detectors have some position
and beam size sensitivity. For the most accurate measurements, the beam should
normally be centered on the sensor surface and the beam diameter should ideally
be close to that of the original calibration conditions, which is 100% encircled
energy (of a semi-Gaussian beam stopped at 1/
e 2 ) applied to a diameter equal to
80% of the detector aperture. The use of a QED Attenuator/Diffuser 6 , a divergent
lens, a Lambertian diffuser such as opal glass, or any other method of beam
spreading, is recommended for this purpose. Please take note that all of the laser
light must be directed within the detector aperture and that the transmission loss
through the optical component must be known.
6 See optional accessories section.