Thermo Scientific Surveyor UV Plus, Руководство по оборудованию

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2
Installation
Making the Back Panel Connections
20 Surveyor UV/Vis Plus Detector Hardware Manual Thermo Scientific
Connecting the Analog Outputs
The installation kit provides two analog signal cables (twin-axial computer cables) to connect
the analog outputs from the UV/Vis detector to other data collection devices.
The analog signal cables have three wires protruding from the ends of the shielded cable. Two
of these wires are electrically insulated and carry an analog signal to data collection devices.
Typically, the wire with the clear insulation is connected to the positive analog output, and the
wire with the black insulation is connected to the signal ground (sometimes referred to as the
negative signal). The third wire is not insulated and grounds the cable shielding. The cable
shielding reduces signal noise caused by radio frequency interference and is most effective if
the bare wire is grounded at just one end.
The ends of the analog signal wires are stripped (1/4 in.) and soldered to allow electrical
contact and to prevent fraying.
There are three analog voltage outputs per channel on the back panel of the UV/Vis detector:
CHA – 10 mV, CHA – 100 mV, CHA – 1 V, CHB – 10 mV, CHB – 100 mV, CHB – 1 V;
and a single ground per channel: GND A and GND B.

To make each electrical connection
1. Insert the end of the wire into the appropriate terminal in the 8-pin terminal connector.
Hold the wire in place while you tighten the small terminal set screw firmly onto the wire.
2. Insert the terminal connector into the 8-pin analog connector numbered 9 through 16 at
the back of the instrument (see Figure 17 ).
Figure 17. Analog signal connectors
Note You must use a Thermo Scientific data system (or equivalent) to control the
UV/Vis detector. When the detector is under the control of a Thermo Scientific data
system, you can convert the analog output signals with an analog-to-digital converter and
process the data with a third-party data system. You can also use the analog outputs and an
analog-to-digital converter for diagnostics.
IMPORTANT Avoid connecting the detector ground terminals to any earth ground on
your data system computer. Doing so leads to an increased noise level and a
subsequent decrease in sensitivity.
1
2 3 4
5
6
7
8
9
0
1
2 3 4
5
6
7
8
9
0
1 2 3 4 5 6 7 8
RS232 UNIT ID ENET
EVENT GND ZERO READY RUN NC +5V @ 150mA GND GND B CHB
_
1V
CHB
_
100mV
CHB
_
10mV
GND A CHA
_
1V
CHA
_
100mV
CHA
_
10mV
9 10 11 12 13 14 15 16
Analog signal 8-pin connector