Section 4 | Operation with 0012B Control Display Unit
Page | 6
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2021
– Valeport Ltd
The REAL TIME rate and speed are calculated from the time for one pulse, resolved to 0.0001
secs.
In TIME mode, the real time is calculated and displayed every second.
In PULSE mode, the real time is calculated every pulse but the display is only updated every 0.5
seconds [approx.].
4.1.3.3 Standard Deviation
The STANDARD DEVIATION [SD] is calculated from real time samples taken during the averaging
period (once per second in TIME mode or once per pulse in PULSE mode).
4.1.3.4 Averaging Modes
The unit performs one average, on a time or pulse basis. At the end of the average period the unit
stops and displays the average and SD, and will commence another averaging period when
requested by pressing START.
This is fixed average with automatic restart of average at the end of each period. The average and
SD from the previous period are displayed and held during the subsequent period, until updated.
The average and SD are calculated over the last period [pulses or time as set], and is updated
every second or pulse as appropriate. In TIME mode the display update is every second, but in
PULSE mode the fastest display update is about every 0.5 secs, although the calculation may be
done more quickly. When STOP is selected, the display is frozen at the last average that has been
computed.
If the measurement period is terminated prematurely (by pressing the STOP key), the average
values and standard deviation will be calculated from the last measurement parameter (pulses in
PULSE mode, seconds in TIME mode).
4.1.3.5 Data Output
In fixed average a data string of average data is outputted at the end of averaging period.
In moving average the last saved average is outputted when the user presses the STOP key.
In free running mode the data is outputted at the end of each fixed average period and when the
user presses the STOP key.
The data string includes meter type, rev/sec, speed, standard deviation, pulses, time.