Teledyne 3010MA, Руководство по эксплуатации, Страница: 52 / 88

Part 1 Control Unit Model 3010MA
Teledyne Analytical Instruments
52
The beginning span value is shown in the upper left corner of the
display. As the span reading settles, the screen displays and updates
information on
Slope . Spanning automatically ends when the slope is less
than 1/50 of the displayed value of the oxygen concentration (in ppm) for
three minutes. Then the instrument automatically returns to the analyze
mode.
4.4.1.2 M
ANUAL
M
ODE
S
PANNING
Press
Span
to start the
Span
function. The screen that appears
allows you to select whether the span calibration is to be performed
automatically or manually.
Span: Settling:MAN
<ENT> For Next
Use the
∆∇
keys to toggle between
AUTO
and
MAN
span settling. Stop
when
MAN
appears, blinking, on the display. Press
Enter
to move to the
next screen.
Span Val: 100.00
<ENT>Span <UP>Mod #
Press
∆
( <UP> ) to permit modification ( Mod # ) of span value.
Use the arrow keys to enter the oxygen concentration of the span gas
you are using. The < > arrows chose the digit, and the
∆∇
arrows choose
the value of the digit.
Press
Enter
to enter the span value into the system and begin the
span calibration.
Once the span has begun, the microprocessor samples the output at a
predetermined rate. It calculates the difference between successive
samplings and displays this difference as
Slope on the screen. It takes
several seconds for the first
Slope value to display. Slope indicates rate
of change of the
Span reading. It is a sensitive indicator of stability.
#### % Span
Slope=#### ppm/s
When the
Span value displayed on the screen is sufficiently stable,
press
Enter
. (Generally, when the
Span reading changes by 1% or less of
the full scale of the range being calibrated for a period of five minutes it is
sufficiently stable.) Once
Enter is pressed, the
Span reading changes to
the correct value. The instrument then automatically enters the
Analyze
function.