Hach 3650 manual Storing Measurements In the Instrument, Automatic Data Acquisition

2.3 Storing Measurements In the Instrument

The analyzer will store up to 500 gas measurement values, labeled by numbers 0 through 499, along with the current date and time of each measurement. You have the choice of acquiring this information manually or automatically, as described below.

Before storing measurements, you should verify the date and time settings of the instrument's internal clock, as described in “Clock Settings” on page 39.

2.3.1 Automatic Data Acquisition

Note:

When the instrument is used to automatically store measurement data, all buttons except the POWER key are disabled. If enough time elapses to store all 500 values, the instrument will return to normal measurement mode and the buttons re-enabled.

Before starting automatic measurement storage, first select the sampling rate desired using the Sampling Rate menu of the WinLog97 program (see “Automatic Data Acquisition - Setting Sampling Intervals” on page 26).

1) Switch the instrument OFF (by pressing the POWER key)

2) Then hold down the STO button while switching the instrument back ON. The LCD displays the message Sto for about one second

3) Normal gas concentration measurements are displayed for about two minutes

4) After two minutes the instrument displays the sample number (starting at 000), then the gas concentration measurement value followed by [---]to indicate the measurement is being stored.

5) This storage sequence repeats automatically, at the rate specified by the WinLog97 program Sampling Rate menu. Values are stored sequentially in sample numbers 000 through 499.

Note:

If you have not cleared previously stored values, the storage sequence automatically overwrites the older values, as they are stored.

To end automatic storage, switch the instrument OFF (by pressing the POWER key) while it is in normal measurement mode and not while it is in the process of automatically storing data.