Teledyne 6020 - Photometric analyzer - Manual (Page 86)

3 Maintenance Model 6020
3-8 Part II Teledyne Analytical Instruments
control calibration solenoids and filters. To gain access to this terminals, the
silkscreen cover must be removed. These terminals are wired in the factory.
WARNING: DANGEROUS HIGH VOLTAGES ARE PRESENT AT
THESE TERMINALS. TRAINED PERSONNEL MUST
REMOVE THE SILKSCREEN COVER ONLY. EXER-
CISE EXTREME CAUTION.
The first strip terminal has three contacts labeled N, G and H. The
labels stand for Neutral, Ground, and Hot. This is the AC power strip
terminal. It feeds AC power to other components of the Model 6020 Sys-
tem, such as the D2 lamp power supply, heater, and temperature controller
PCB.
The second strip terminal has four contacts labeled SHLD, SIG, GND,
MEAS and REF. This strip terminals are dedicated to the signals coming
from the photodetector amplifier. The labels stand for:
SHLD: Shield. Shield form the preamplifier cable connects to this contact.
SIG GND: Signal Ground. Ground reference for both the measure and the
reference signal.
MEAS: Measure Signal voltage.
REF: Reference Signal voltage.
The third terminal strip has eight contacts labeled -230 VDC, +15 VDC, -15
VDC, COM, SPAN FLTR, SPAN SOL, ZERO FLTR, ZERO SOL. This
strip feeds the high voltage needed on the cathode of the photodetector, DC
power for the photodetector preamplifier, and control signals for the sole-
noids and filters. The labels stand for:
-230 VDC: This is the negative high voltage fed to the photodetector
cathode, about -230 VDC.