11
3.3.7
λ
Wavelength Decrement
Same as
λ
except that this key decrements the wavelength.
3.3.8 Power
This key turns the power to the 1830-C on and off. To turn the meter on,
depress the key until it clicks. To turn the meter off, press the key again
until it clicks and rebounds to its original position.
3.3.9
ATTN
Optical Attenuator
This key selects whether the responsivity value for the detector-alone, or
the value for the detector-with-attenuator is used. When the attenuator
mode is on, the ATTN annunciator is lit and the responsivity value for the
detector-with-attenuator is used. When the attenuator mode is off, the
ATTN annunciator is off and the detector-alone responsivity value is used.
3.3.10
BKLT
Backlight
This key cycles the brightness level of the LCD backlight between off,
medium, and high.
3.3.11
BEEP
Audible Beeper
This key turns the variable frequency beeper on and off. The frequency of
this tone varies as a function of the optical power being measured. The
real-time audible feedback is very helpful when trying to maximize optical
through-put.
3.3.12
AUTO
Automatic Signal Ranging
This key enables and disables the auto-range feature. When auto-range is
enabled, the AUTO annunciator is displayed and the amplifier gain in the
1830-C will be automatically controlled to maximize the analog-to-digital
converter resolution. When auto-range is disabled, the AUTO annunciator
is turned off and the signal range is left in its present state. Signal ranging
can be manually controlled by the RANGE(䉱) and RANGE(䉲) keys, as
described below.
NOTE
The 1830-C has 8 signal ranges (R1-R8) which are one decade apart. The
ranges available are detector dependent. For example, when using the
1830-C power meter with Newport’s 818-IR, the lowest available range is
R3. This is due to the fact that this germanium detector inherently has a
large noise equivalent power (NEP).
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