User Guide
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7 Output Intensity Modes/Calibration Process
7.1.1
Calibration of the exposure timer is not required.
7.1.2
The S2000 system uses a quarts crystal to generate it’s system clock signal. It
provides a stable and precise clock signal to the S2000 control system and
sub-systems, including the timing module of the light intensity control shutter.
7.1.3
The accuracy of the S2000 exposure time is therefore determined by the
oscillating frequency stabil
ity of it’s quartz crystal. Quartz crystals are well
known to oscillate at a constant frequency throughout their lifetime.
7.1.4
The S2000 design allows
Lumen Dynamics
to Guarantee the Exposure Timer
Tolerance for the lifetime of the product. The exposure does not need
calibration.
7.1.5
The S2000 system can operate in two different output intensity modes:
Absolute or Relative.
7.1.6
Absolute mode: refers to the condition when the S2000 has been calibrated.
The display will show an absolute value of irradiance in W/cm2 and the front
panel “CAL” LED is ON.
7.1.7
Relative mode: refers to the condition when S2000 has not been calibrated.
The display will show the percentag
e of iris opening and the front panel “CAL”
LED is OFF.
7.1.8
Section 8 describes adjusting the light output in both relative and absolute
modes in greater details.
7.1.9
The S2000 can be calibrated and correspondingly set to a specified irradiance
(set point) by the R2000 Radiometer. The R2000 Radiometer connects to the
S2000 via the front side panel RS-232 radiometer port.
7.1.10
While the CAL button on the radiometer is pressed, the display will indicate the
current set point and the SET icon will be flashing. If the CAL button on the
radiometer is pressed for less than 5 seconds the current radiometer set-point
will be sent to the S2000.
7.1.11
Holding this button for 5 seconds will store the current optical input into the
radiometer’s set point (this feature can be enabled or disabled via PC). The
SET Icon will cease flashing and be continuously on until the button is
released.
S2000 Exposure Timer Tolerance:
+/- 250ms or +/- 1% of the exposure time setting, whichever is
greater.
