Lake Shore Model 102 User’s Manual
Service 4-1
CHAPTER 4
SERVICE
4.0 GENERAL
This chapter covers Output Current Programming in Paragraph 4.1 and
Calibration in Paragraph 4.2.
4.1 OUTPUT CURRENT REPROGRAMMING
Although the Model 102 is factory preset for a current output of 10 µA, users
may set it to any value between 1 µA and 1 mA. The equation used to
determine the value of the new programming resistor is:
I
out
=
2
R
program
Use the following procedure to change the programming resistor.
1. To open the unit, remove the four rubber feet and four screws from the
bottom of the unit. Gently separate the top half of the enclosure from the
bottom half and front panel.
2. Remove factory-installed programming resistor R11 by clipping its leads.
See Figure 4-1.
3. Install the new programming resistor by soldering it to the turrets
provided on the circuit board.
4. Recalibrate the unit.
5. Replace top of enclosure, screws, and feet. Resume normal operation.
4.2 CALIBRATION
This unit has been thoroughly tested and calibrated to published
specifications prior to shipment. However, periodic recalibration is
recommended every six months to ensure accuracy. Recalibration is also
necessary if the unit is reprogrammed to a different output current. Either
of the following calibration methods are acceptable.
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