Lake Shore Model 102 User’s Manual
Operation 3-1
CHAPTER 3
OPERATION
3.0 GENERAL
This chapter covers Front Panel Features and Functions in Paragraph 3.1
and Operational Notes in Paragraph 3.2.
3.1 FRONT PANEL FEATURES AND FUNCTIONS
COMPLIANCE LED. This indicator glows green when the unit operates with
output within the specified compliance range (below 8 V.) The LED will not
light if the current through the load is no longer at its rated level resulting in
an invalid voltage reading. The LED will also go out if the unit is
disconnected from power and no longer operates.
POWER Input Jack. Accepts the plug from the external wall-mounted AC
transformer.
CURRENT OUTPUT Terminals. Accept standard dual banana plugs for
voltmeter and sensor connection. The polarity of the terminals is marked on
the front panel.
3.2 OPERATIONAL NOTES
1. Although the Model 102 is factory preset for current output of 10-µA, it is
actually “programmable” to any value between 1 µA and 1 mA. See
Paragraph 4.1.
2. To ensure accurate voltage readings across the sensor, use a voltmeter
with high input impedance. This prevents the combined impedance
(sensor in parallel with voltmeter) from causing a misleading
measurement.
3. The Model 102 isolates AC line input noise from the current source
circuitry. However, some AC noise pickup may still occur (from the test
leads, AC-powered voltmeters, etc.), possibly affecting system accuracy.
4. If the unit is turned on without a load connected across the output
terminals, the unit will be operating “out of compliance” and the green
LED will not light. This may mislead user into thinking the unit is not
functional. Add a load to correct the apparent problem.
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