Lake Shore 625, Руководство пользователя

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Lake Shore Model 625 Superconducting MPS User’s Manual
Operation 4-9
4.12 RAMP SEGMENTS
Many magnets cannot be charged or discharged at the same rate throughout its entire current capacity. Typically the
magnet cannot be charged as fast when the current in the magnet is high. The Model 625 has a ramp segment feature that
can change the output current ramp rate based on the output current setting. As the output setting ramps through the
segment boundary, the new ramp rate will be used although it will still be limited by the maximum ramp rate setting.
Refer to Paragraph 4.11.3 to set the maximum ramp rate.
To use the ramp segment feature, the ramp segments must be enabled and the ramp segment table must be setup to
specify which ramp rate to use for each current setting. The table should be setup in order of increasing current. A
current entry of 0 A indicates the end of the table and the instrument will not search any higher in the table.
To configure the ramp segments press Ramp Segments . The first ramp segments setup screen appears as a prompt for
the ramp segments mode.
Ramp Segments
Select With °®
Ramp Segments: Enable
Use the
s
or
t
key to select the ramp segments mode, either Enable or Disable. Press Enter to accept the new selection
and continue to the next setting screen. Press Escape to cancel the new selection and return to the normal display.
If the ramp segments are enabled, the next ramp segments screen that appears is for entering or editing the ramp
segments table. All five of the ramp segments are shown on the display at the same time. The segments should be
entered in order of increasing current. An entry of 0 A will indicate the end of the table and the instrument will not
search beyond that segment.
Ramp Segments
Current Ramp Rate
1: 10.0000 A 1.0000 A/s
2: 15.0000 A 0.8000 A/s
3: 20.0000 A 0.7000 A/s
4: 30.0000 A 0.6000 A/s
5: 40.0000 A 0.5000 A/s
When the segment number is highlighted, use the
s
or
t
key to scroll through the ramp segments. Press the Enter key
when the desired segment number is highlighted and continue to the current field.
When the current field is highlighted, use the numerical keypad to enter the upper current setting for that ramp segment
in amps. Press
Enter to accept the new selection and continue to the ramp rate field. Press Escape to restart the setting
sequence and enter a new value. Press Escape again to highlight the segment number.
When the ramp rate field is highlighted, use numerical keypad to enter the applicable ramp rate in A/s. Press Enter to
accept the new selection and continue to the next segment. Press Escape to restart the setting sequence and enter a new
value. Press Escape again to highlight the segment number.
Similarly enter or edit all ramp segments. When complete, press the Escape key while the segment number field is
highlighted to exit the ramp segment edit screen and return to the normal display