Lake Shore Model 102 User’s Manual
2-2 Installation
2.3 POWER AND GROUND REQUIREMENTS
The Model 102 requires a power source of 90 to 125 or 200 to 250 VAC, 50
or 60 Hz, single phase. The proper wall mounted AC power adapter ships
with the Model 102. Connect to front panel power plug.
WARNING: To prevent electrical fire or shock hazards, do not expose
this instrument to rain or excess moisture.
NOTE: Do not attach the shield to earth ground at the sensor end. It may
introduce noise at the measurement end.
Shield sensor cables whenever possible. Attach shields to the connector
shield pin.
2.4 SENSOR INSTALLATION RECOMMENDATIONS
Although the Model 102 acts as a current source for any application, it can
provide the 10 µA excitation current for Lake Shore 400-Series, 500-Series,
and TG-120 Diode Sensors. See the Lake Shore Product Catalog for
installation details and sensor specifications. Call Lake Shore for copies of
application notes or sensor installation questions.
Although a sensor is not
provided with the Model 102, below are general recommendations on sensor
installation:
1. Do not ground the sensor.
2. Shield leads and connect shield wire to SHIELD on screw terminal
connector only. Do not connect shield at other end of cable.
3. Keep leads as short as possible.
4. Use twisted-pair wire. Use Lake Shore Duo-Twist™ wire (or equivalent)
for two-wire, or Quad-Twist™ wire (or equivalent) for four-wire
applications.
5. Thermally anchor lead wires.
2.4.1 Connecting Leads To The Sensor
Excessive heat flow through connecting leads to any temperature sensor
may differ the temperature between the active sensing element and the
sample to which the sensor mounts. This reflects as a real temperature
offset between what is measured and the true sample temperature.
Eliminate such temperature errors with proper selection and installation of
connecting leads.
To minimize heat flow through the leads, select leads of small diameter and
low thermal conductivity. Phosphor-bronze or Manganin wire is commonly
used in sizes 32 or 36 AWG. These wires have a fairly low thermal
conductivity, yet electrical resistance is not large enough to create
measurement problems.
To Next Page
Loading...