14
FRONT PANEL
Figure 4 Front Panel of the Model 301/302 TDA
Located in the center at the top of the electronics module is the LED voltage display of
the signal (
FIGURE 4
), which is indicated as DP, IP, RALS, LALS, RI or UV by the appropriate
light on the left of the electronics module. Readout shown on the meter is in units of millivolts,
which matches the analog output voltages available on the back panel. For the DP signal, 1.0
mV corresponds to a pressure of 1 Pa. For the IP signal, 10 mV corresponds to 1 kPa. The LS
signal corresponds to mV from the photodiode amplifier of the light scattering detector and the
refractometer signal corresponds to the mV output of the refractometer. Full scale data ranges
are established in the TriSEC software package for each channel between 100mV, 500mV, and
2500mV FS. Default ranges are 2500mV FS for IP, 500mV FS for DP, 2500mV FS for LS and
500mV FS for RI.
In the center of the module is a set of five push-buttons: two for SELECT, ZERO,
TRIGGER, and LASER:
ELECTRONICS MODULE
OVEN MODULE
