Lake Shore 625, User Manual

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Lake Shore Model 625 Superconducting MPS User’s Manual
Operation 4-3
PSH Setup
Setup persistent switch heater enable, current, delay time, and persistent mode ramp rate.
Refer to Paragraph 4.14.
Quench Detect
Setup quench detect enable and current step limit. Refer to Paragraph 4.16.
Display Setup
Setup display mode and brightness. Refer to Paragraph 4.4.
Escape
Exits from parameter setting sequence without changing the parameter value. Press and
hold to reset parameters to default values. Refer to Paragraph 4.21.
Field Constant
Setup the field constant value and units. Refer to Paragraph 4.13.
External Program Setup the external current programming mode. Refer to Paragraph 4.18.
Computer Interface Setup RS-232 and IEEE computer interfaces. Refer to Paragraph 4.20.
Ramp Segments
Setup ramp segment values. Refer to Paragraph 4.12.
Max Settings
Setup maximum setting values for output current, voltage, and ramp rate. Refer to
Paragraph 4.11.
Status
Displays a summary of the instrument status. Refer to Paragraph 4.17.
Enter
Accepts a new parameter value. Press and hold to lock keypad. Refer to Paragraph 4.19.
0-9, ±, . Numeric data entry within a setting sequence.

(Up) Increments a parameter selection or value.

(Down) Decrements a parameter selection or value.
PSH On
Turns the persistent switch heater on. Refer to Paragraph 4.15.
PSH Off
Turns the persistent switch heater off
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.
4.3.2 General Keypad Operation
The Model 625 uses three basic keypad operations, direct operation, setting selection and data entry, for the majority of
operator interface. A few specialized keypad operations, such as ramp segment entry, are described in the individual
operation paragraphs.
Direct Operation: Key functions occur immediately when the key is pressed. Zero Output , Stop Output, and Pause
Output are examples of keys that operate this way.
Setting Selection: Allows the user to select from a finite list of parameter values. During setting selection the

and

keys are used to select a parameter value. Enter is used to accept the change and advance to the next parameter. Escape
will cancel the change to that parameter and return to the normal display. Setting selection screens always include the
message: “Select with

”.
Data Entry: Allows the user to enter numeric parameter values using the data entry keys that are printed on the key tops.
Data entry keys include numbers from 0 to 9, sign, and decimal point. The labels printed above the keys describe the key
function during normal operation. When one of the keys is pressed and a data entry sequence is started, the keys follow
the data entry functions printed on the key tops. Once the correct parameter value is entered, press
Enter to accept the
change and advance to next parameter. Pressing Escape once will clear the new value and restart the setting sequence.
Pressing Escape again will return to the normal display. Data entry screens always include the message: “Enter a value
for”.
Related setting selection and data entry sequences are often chained together under a single key. To skip over a
parameter without changing its value, press
Enter before pressing an arrow or number key. To return to the normal
display in the middle of a setting sequence, press Escape before pressing an arrow or number key. Changes “entered”
before Escape is pressed are kept.