22
A momentary press of the
STORE REF
key causes the
Model 840-C to beep and to display the reference power
stored in non-volatile RAM. STORE key operation is
denoted in the wavelength display by
SSSSS
T O
T O
T O
T O
T O
.
Depressing the
STORE REF
key for longer than 3 seconds
causes the Model 840-C to double beep and overwrite the
non-volatile memory location with the next power reading
measured. The wavelength display will still indicate
Sto
.
3.4.9
,
Tone
The
, TONE
key toggles the audio output of the Model
840-C on or off. When on, the Model 840-C indicates signal
level through the frequency of an audio beeper. The
higher the signal level, the higher the frequency. When in
AUTO
mode, the frequency may rapidly rise and fall if
signal level changes cause the front end amplifier to auto
range through gain stages. If the input signal is
modulated, the audio output will similarly be modulated.
Under such circumstances, it may be useful to use the
manual ranging mode.
3.4.10
,
Time Constant
The
, TIME CONSTANT
key cycles the display through
three moving averages of recent A/D conversions. In the
F
ast
mode the display shows the most recent A/D conversion. In
the
M
edium mode the display shows the average of the 4
most recent conversions while in the
S
low mode, the display
shows the average of the 16 most recent conversions.
3.4.11 Auto
The
AUTO
key toggles the Model 840-C between autoranging
and manual ranging modes. If the
RANGE
key is pressed
when in the
AUTO
mode, the Model 840-C exits the
AUTO
mode. When exiting the
AUTO
mode, the Model 840-C stays
at the gain established by the autorange mode until manu-
ally altered.
3.4.12 Range
The
RANGE
rocker switch allows for manual increase or
decrease of the gain of the front end amplifier by pressing
either the up or down arrow. Pressing the
key
decreases amplifier gain (going to less sensitive ranges),
while pressing the
key increases the amplifier gain
(going to more sensitive ranges). When
RANGE
is
pressed, the Model 840-C enters manual ranging mode
and remains there until
AUTO
is pressed.
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Содержание 840-C
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