Mantis 5000 Specifiche Scaricare il pdf (Pagina 41)

Caution

Both instrument and DRA are calibrated at the factory and should be recalibrated only

when tests indicate the need for it.

When should I perform a calibration?

Below are some common reasons that may indicate the necessity for calibration.

Calibrate PGA (Programmable Gain Amplifier)

PGA calibration should be executed each time a DRA is installed in a Cary instrument

for the first time, and after each time it is removed. At other times, the need for it may

be seen on an uncorrected baseline as steps or plateaus or on a corrected baseline as

small spikes-either positive or negative.

UV/VIS 0%T Correction

This calibrates the photomultipliers for 0%T (electronic zero) effects. This is executed

every time the instrument is switched on except if a DRA is installed (where the DRA

correction factors stored in the DRA EEPROM are used).

Instrument check: If high precision is needed at high absorbance, measure the 0%T

error at 500 nm in the UV-VIS (blocked sample beam). The error should be less than

0.0003 %T. Calibrate with the instrument fully warmed up. It may be desirable to

calibrate Calibrate PGA prior to this.

NIR 0%T Correction

This is the NIR equivalent for 0%T error.

Instrument check: After instrument has fully warmed up, go to wavelength 1200 nm

with grating change at 800 nm and block the sample beam with a black metal mask. If

the error exceeds 0.003 %T calibration may be required.

Calibrate UV/VIS wavelength range

Execute this if wavelength accuracy fails using certified standards.

This option causes the Cary to use the deuterium lamp to calibrate the instrument at

656.1, 486.0 and 0.00 nm.

Note

When performing a wavelength calibration you must firstly remove the DRA,

perform the calibration, then return the DRA to the instrument. Refer to the

Wavelength Accuracy

help in the Validate application.

Calibrate NIR wavelength range

Execute this if wavelength accuracy fails using certified standards.

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 47 48 49

Nessun commento

Mantis 5000 Specifiche Pagina 41