Philips pm2521 - 6. OPERATION

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6. OPERATION
6.1. SWITCHING ON
The instrument is ready for use after connection to the mains. It is switched on by depressing pushbutton-
switch POWER.
*
Remarks: ^
After switching on the display will show —CAL— for about ten seconds. In this period the PM 2521 carries
out an internal calibration procedure.
After the calibration procedure the PM 2521 jumps to the function that is selected by the function selector.
When the PM 2521 is brought from a cold into a warm environment, condensation can cause incorrect
readings.
6.2. CONTROLS «
6.2.1. Front panel (Fig. 22 page 142).
DESCRIPTION APPLICATION
POWER
POWER ON/OFF pushbutton switch
AUTO/MAN*
STOP
RESET
Multifunction pushbutton
AUTO/MAN*
Pushbutton for selection between automatic or manual ranging mode, with exception
of function s. Manual ranging mode is indicated with a * on the righthand
side of the display. The manual ranging mode functions in conjunction with the UP
and DOWN pushbutton. In automatic ranging mode, in a 414 digit function, the UP
ranging level is at a display of 20200 and the DOWN ranging level at a display of 01800.
For 3% digit function these figures respectively are 2020 and 0180.
To eliminate the hysteresis in the automatic ranging mode, a higher or lower range can
be selected with pushbuttons UP or DOWN.
UP between display 18000 and 20200 (1800 - 2020)
DOWN between display 01800 and 02020 (0180 - 0202)
"stop
STOP and RESET pushbutton in the timer function (s). If the STOP/RESET push-
RESET
button is depressed when the PM 2521 is measuring, than the measurement is stopped.
If the STOP/RESET pushbutton is depressed when a measurement is completed, than
the PM 2521 is reset, and a new measurement can start.
V