Vernier DataMate Guidebook - Manual (Page 24)

DataMate Guidebook 22
EVENTS WITH ENTRY is used for non time-based data collection such as triggering for titrations,
Boyle’s law, etc. Data are collected one point at a time and only when the
ENTER
button on the
calculator is pressed. You are then prompted to enter a corresponding value.
SINGLE POINT data collection is used to collect one averaged data point. The interface will
collect data for 10 seconds and report a single, averaged value for each sensor on the calculator
screen.
SELECTED EVENTS mode collects data from each channel in response to pressing the
ENTER
key, but the user does not enter any values. Data are plotted vs. point number.
Calibration
When a sensor is selected, DataMate automatically loads the standard calibration settings.
Further calibration is usually not needed.
If you choose to calibrate a sensor, position the cursor opposite the sensor and choose
CALIBRATE from the SETUP screen.
There are two ways to calibrate a sensor. The first is to perform a new calibration; the second
way is to manually enter the calibration values.
Almost all Vernier sensors are calibrated with two reference points. This example describes the
calibration of a pH sensor. To perform a new calibration for a pH sensor, you would need two
solutions with known pH values: for example, solutions with values of 4 and 10. Here are the
steps you might follow:
1. On the Setup screen, to move the cursor to the sensor you want
calibrated and select
CALIBRATE .
Note: Not all sensors can be calibrated (Stainless Steel Temperature Probe, for example). If you
select a sensor that cannot be calibrated, DataMate does not respond when you select
CALIBRATE .
2. The current calibration will be displayed. Select CALIBRATE NOW.
3. Put the pH sensor in the pH 4 solution. Wait until the voltage number
on the screen stabilizes and then press
ENTER .