Sper scientific Large Display Conductivity Pen - 850037, Руководство пользователя, Страница: 31 / 56

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Selecting the Measurement Range (rAn)
There are two measurement ranges.
The pen defaults to auto-ranging
Conductivity
Range 1
0 to 1999 µS
Range 2
0 to 19.99 mS
To manually select the measurement range:
1. Press
SET
to turn the pen
on
.
2. Press ▲ for more than 2 seconds to
select range 1. Press ▲for more than
2 seconds to select range 2.
2.Press " " or " " more than 2
seconds to select the range.
CALIBRATION MODE (CAL)
12
To manual select the measurement
range:
1. Turn on the meter and stay at normal
measurement mode.
(Default)
Press" "
> 2 second
Press" "
> 2 second
PREPARATION FOR CALIBRATION
Two issues need to be prepared and
considered before operation. First,
what is the right calibration standard?
Second, when should you calibrate?
Selecting a calibration standard
For best results, select a conductivity
or TDS (8361) or NaCl (8371) standard
near the sample value you are measuring.
Alternatively, use a calibration solution
value which is approximate 2/3 of the
full scale of the measurement range you
plan to use.
For example, in the 0 to 1999 uS range,
use 1413 uS solution for calibration.
DO NOT reuse the calibration solution.
Contaminants in the solution will affect
the calibration and the accuracy. Be
sure to use fresh solution each time.