Vaisala PTB220 User Manual download pdf (Page 90)

USER'S GUIDE_______________________________________________________________________

84 ___________________________________________________________________ M210194EN-A

The figure below illustrates in practice the falling edge of the trigger

pulse (lower signal) and the start of pulse outputting (upper signal).

The gate-open time may be calculated in practice using a simple

formula:

maximum number of output pulse

ulse rate (Hz)

+ 0.5 ... 1 second

(D-1)

If SLOW pulse rate (appr. 5 kHz) and LOW resolution (0.1 hPa/mbar)

and no pressure offset have been defined using the PULSE command

then the barometer will output maximum 11.000 pulses at 1100

hPa/mbar pressure. The gate-open time could be 3 seconds.

If FAST pulse rate (appr. 50 kHz) and HIGH resolution (0.01

hPa/mbar) and no pressure offset have been defined using the PULSE

command, the PTB220 series barometer will output a maximum of

110.000 pulses at 1100 hPa/mbar pressure. The gate-open time could

be 3 seconds.

If FAST pulse rate (appr. 50 kHz), HIGH resolution (0.01 hPa/mbar)

and 900 hPa/mbar pressure offset have been defined using the PULSE

command, the PTB220 series barometer will output a maximum of

20.000 pulses at 1100 hPa/mbar pressure. The gate-open time could be

1 second.

If FAST pulse rate (appr. 50 kHz) and LOW resolution (0.1 hPa/mbar)

and no pressure offset have been defined using the PULSE command,

the PTB220 series barometer will output a maximum of 11.000 pulses

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Vaisala PTB220 User Manual Page 90