Lakeshore Learning Materials 642 - Manual (Page 43)

Lake Shore Model 642 Electromagnet Power Supply User’s Manual
Operation 4-3
4.4 KEYPAD DEFINITION
The Model 642 has 22 keys separated into 3 groups on the instrument front panel. The sixteen keys in the center of the
grouping combines instrument setup and data entry. The keys below control the output current and ramping. The keys to
the right control the computer interface mode of the instrument. See Figure 4-2 for key locations. Refer to Table 4-2 for
keypad descriptions.
Figure 4-2. Model 642 Keypad and LED Layout
Table 4-2. Model 642 Key Descriptions
Magnet Water Selects the magnet water setup menu. Refer to Paragraph 4.12.
Internal Water Selects the internal water setup menu. Refer to Paragraph 4.13.
Display Setup Sets the display brightness. Refer to Paragraph 4.5.
Escape
Exits from parameter setting sequence without changing the parameter value. Press and hold to
reset parameters to default values. Refer to Paragraph 4.18.
External Program Setup the external current programming mode. Refer to Paragraph 4.15.
Computer Interface Setup RS-232C and IEEE-488 computer interfaces. Refer to Paragraph 4.17.
Ramp Segments Setup ramp segment values. Refer to Paragraph 4.8.
Max Settings Setup maximum setting limits for output current, and ramp rate. Refer to Paragraph 4.11.
Status Displays a summary of the instrument status. Refer to Paragraph 4.14.
Enter Accepts a new parameter value. Press and hold to lock keypad. Refer to Paragraph 4.16.
0-9, ±, . Numeric data entry within a setting sequence.
H (Up) Increments a parameter selection or value.
I (Down) Decrements a parameter selection or value.
Output Setting Sets the output current. Refer to Paragraph 4.6.
Ramp Rate Sets the output current ramp rate. Refer to Paragraph 4.7.
Pause Ramp
Pauses the output ramp and holds the current where it was pause pressed. Press again to
continue ramp. Refer to Paragraph 4.9.
Zero Output Ramps the current to 0 A at the programmed ramp rate. Refer to Paragraph 4.10.
Remote Places the instrument to Remote mode. Refer to Paragraph 5.1.2.
Local Returns the instrument to Local mode if in Remote. Refer to Paragraph 5.1.2.