YOKOGAWA AQ6370D User Manual

5-30
IM AQ6370D-01EN
Explanation
CHOP MODE
This mode activates the internal chopper of the monochromator.
Stray light specific to the monochromator is reduced by turning the chopper.
When CHOP MODE is set to SWITCH, measurements of better S/N can be made. You
can set the CHOP MODE to SWITCH if the sensitivity setting is HIGH1 to HIGH3 or MID.
CHOP MODE Function List
CHOP
MODE
Function Merit Defect
OFF
Measurement according to
the stray light.
Measurement time
is rapid even for
high sensitivity
measurements.
Since the stray light
is also measured, the
low level component
is not accurate if the
light source is of high
power.
Stray light suppression ratio:
40 dB or more
SWITCH
Two sweeps per
measurement are performed.
The rst sweep measures the
stray light component, and
high dynamic measurement is
possible through subtraction.
Short-duration
measurement can be
taken with stray light
removed.
If the measurement
duration is long, it is
inuenced by temporal
changes in the
measured light.
Stray light suppression ratio:
60 dB or more
Stray Light from the Monochromator
The instrument has a newly designed, high-performance monochromator. Depending
on the measurement conditions, stray light at a level 30 to 50 dB below the original
spectrum, as well as other stray light specific to the monochromator may occur in
wavelength areas 100 to 200 nm from the peak wavelength. If this stray light is likely to
have a severe impact on measurements, the sensitivity can be set to MID or HIGH 1 to 3
and CHOP MODE can be set to SWITCH in order to reduce the effects of the stray light.
Waveform with CHOP MODE OFF CHOP MODE set to SWITCH
5.9 Sensitivity Settings

YOKOGAWA AQ6370D Specifications

General

Brand	YOKOGAWA
Model	AQ6370D
Category	Measuring Instruments
Language	English