Newport 840-C, Руководство оператора

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The various key functions of the Model 840-C modify the
displayed value of sensor current measured by the front
end amplifier to account for calibration values or display
units. A valid key input is responded by the 840-C with a
short audio response.
3.4.1 , Shift
The , SHIFT key toggles the keyboard between white and
blue functions. When the , SHIFT annunciator is on, the
blue key functions are enabled. The keyboard remains in
a given mode until the
SHIFT key is again depressed.
3.4.2 , Hold
The , HOLD key causes the meter to freeze the next
power reading in the display and light the , HOLD
annunciator. The display remains frozen until the ,
HOLD key is again pressed.
3.4.3 , Attenuator
The , ATTENUATOR key causes the meter to assume
that the attenuator (supplied with the sensor) has been
installed, and lights the , annunciator. The meter
compensates for the detector plus attenuator combination.
Pressing the , ATTENUATOR key again exits this mode.
3.4.4 , Background
The , BACKGROUND key causes the meter to retain
the next current reading and subtract it from all subse-
quent current readings before subsequent calculations
are performed. This allows the meter to subtract off (or
zero) the signal from ambient surroundings before making
a measurement. Depressing the BACKGROUND key again
exits this mode.
3.4.5 W-dBm
The W-dBm key toggles between linear and logarithmic
measurement modes. When in the linear mode the power
level annunciators are
nW , W , mW or W . When in
logarithmic mode, the power annunciators are dBm or dB .
Definitions of
Key Functions
3.4
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