Spectrum Two HATR User's Guide . 19
2.
Place the pressure pad on the sample plate, in the V-shaped slot in the clamp, so that
the graduated scale on the pressure plate faces toward you.
3.
Push the lever of the clamp into position so that pressure is applied to the sample plate.
Adjusting the pressure
The clamp is supplied pre-set to apply approximately 50 newtons of pressure to a flat crystal
assembly (45° ZnSe). This is a satisfactory setting for most applications.
1.
Read the scale on the pressure pad and use Figure 13 to calculate the approximate
pressure being applied.
Figure 13 Pressure as a function of the spring height of the clamp
2.
To adjust the pressure, turn the screw on the top of the clamp.
CAUTION
Excessive pressures can crack and permanently damage the ATR crystal.
Do not use the pressure clamp to crush the sample, and do not apply
pressure to the crystal for extended periods of time.
