TSI Instruments EVM SERIES, Руководство пользователя

Страница: 33 / 178

Setting up Parameters via the Keypad
Setting Logging and Viewing Run Time
EVM Series User Manual
23
5. To return to the Start screen , repeatedly press On/Off/Esc .
Setting Logging and Viewing Run Time
With the logging screen, you select the logging interval (i.e., 1 min. data logging), the averaging
parameter (i.e., a type of data filter) and which parameters will be logged and stored into memory. An
optional field, Run Time, allows you to view the amount of remaining log time when logged parameters
are selected.
For logging, there are two selectable fields- the logging interval rate and the measurement averaging.
Log intervals Explanation
Log interval This sets the log interval between specific data points. For example, if logging
is set to 5 second intervals, then all parameter values are logged every 5
seconds. The logging parameters options are as follows: 1 second,5 seconds,
15 seconds, 30 seconds, 1 minute, 5 minutes, 10 minutes, 15 minutes, and 30
minutes, and 60 minutes.
Averaging The Averaging parameter is used to average all measurements displayed on
the screen. If averaging is set to 15 then the last 15 measurements are
averaged. (New measurements are updated every second.) This averaged
value is displayed on the monitor. It’s basically a data filter. The averaged data
will change less rapidly than the 1 second data since it is averaged. The user
options are 1 – 30 with increments by 1 interval.

NOTE: 15 second averaging is recommended for the average setting. All
the sensors have settling times of 10 seconds or longer.
Measurements Selectable logged measurements: Level, Lmin, Lmax, Lavg, and STEL.
If the measurement is set to “ On ”, this indicates the instrument will log data at
the logged interval (i.e., while in run mode). “ Off ” indicates the measurement
will not log when in run mode.
The measurements include the following: Level (instantaneous or averaged
measurement), STEL (short term exposure level calculated over last 15
minutes), Lmax (maximum measurement during log interval), Lmin (minimum
measurement during log interval), Lavg (average measurement during log
interval), and TWA (time weighted average measurement during interval).

NOTE : See “Table 5-3” for more information.
Run Time Depending on the logged parameters that are turned “On” for data log and the
log interval, the Estimated Run Time screen will display the total remaining
run time. For example, if you want to log all parameters the overall run time will
decrease significantly. If you would like to extend the run time to a longer
duration, logging one or two parameters would be advisable.
Table 3-2: Logged intervals and selecting logged measurements