General Overview - Thermo Scientific 3403 Manual

General Overview

Thermo Scientific
Test Point Generic Description
TP1 "LM335-1" Voltage @ input to the A/D converter (channel 0).
TP2 "5V" 5 VDC, regulator output.
TP3 "GND" Ground plane.
Positive terminal of the battery. Charging voltage under
TP4 "VBAT"
normal operation; battery voltage in backup.
TP5 "-5V" -5 VDC, regulator output.
TP6 "+4.5V" +4.5VDC, regulator output.
TP7 "LM335-2" Voltage @ input to the A/D converter (channel 1).
TP8 "+12V" Input to the 5 VDC regulator
TP9 "LM335-3" Voltage @ input to the A/D converter (channel 2).
TP10 "RTD1" Voltage @ input to the A/D converter (channel 3).
TP11 "RTD2" Voltage @ input to the A/D converter (channel 4).
TP12 "RTD3" Voltage @ input to the A/D converter (channel 5).
TP13 "TC" Voltage @ input to the A/D converter (channel 6).
TP14 "AC Mon" Voltage @ input to the A/D converter (channel 7).
TP15 "-1.6 Adj" Offset voltage adjustment specific to ULT T/C circuitry.
Note When observing the voltage on any A/D channel inputs, there will
be a voltage 'pulse' that occurs. This is normal and should not cause
alarm.
If any channel is found to be outside the limits of normal operation, 0 to
4.5 VDC, the reading of all channels will become suspect. For instance, if
channel 0 is found to be 5.4 VDC, the readings on channels 1-7 may be
corrupt.
Because TC sensor readings are adjusted or compensated due to the
presence of RH, an erroneous RH reading can cause incorrect CO2 results.
Section 8
Appendices
H07 Application
TC CO2 Input (Resistors, V
m
5 VDC
Gnd
VBAT
Not Used
+4.5 VDC
TC/IR CO2 Input (Thermistors,
- )
V
m
Input to the 5 VDC regulator
Humidity
H20 / Tank RTD
Ambient RTD
Cabinet RTD
Tank Switcher
O2 Input
Not Used
Midi 40 CO2 Incubator
+ )
8-13