Hach-Lange DR 3900 User Manual - Manual (Page 121)

121
Expanded programs
6.8.4.4 Dilution
1. Press Dilution.
2. Press On.
3. Select the required interval. Press OK to confirm the entry.
4. Select a unit for the interval. Press OK to confirm the entry.
5. Enter the dilution factor. Press OK to confirm.
6. Enter the tolerance as a percentage. Press OK to confirm.
7. Press OK to confirm all the entries.
6.8.4.5 Performing AQA measurement
If a reminder function has been set, once the set interval has
elapsed the requirement to perform an AQA measurement is
issued.
1. Select the required AQA measure – for example a standard
measurement here.
2. Perform the standard measurement via stored program or
barcode program.
3. An AQA symbol is displayed in the measurement window,
the AQA key in the toolbar is displayed as yellow.
4. The AQA measure is shown in a log as Passed or Failed.
6.8.4.6 Pipette test set
This function and the optional accessories tests the accuracy of
the pipette test set. To carry it out follow the instructions in the
pipette test set.
6.8.5 Instrument backup
Prior to the next service date, the "Instrument Backup" offers
the opportunity to store all programs, measurement data, user
IDs, passwords, as well as all adjustable data on a USB stick.