Cryomagnetics Model 4G Operating Instruction Manual 27
Display Units
The Units menu item allows the user to set the display units of the 4G. Available options are
Amperes and Field. The Fields display will auto-range between Gauss, Kilogauss, and tesla. Once
the system of units is selected, the 4G uses that system of units for displaying the output current,
magnet current, and limits.
Persistent Heater Present
This tells the 4G if a persistent switch heater is present. If not, the capability to use fast sweeps will
not be available, and the Persistent Mode Current and Persistent Switch Heater parameters will be
unavailable.
Persistent Mode Current
Persistent mode current displays the present magnet current if it is in persistent mode and it was
last used with the supply. This field may be edited, in case the magnet was placed in persistent
mode using a different power supply, or if the current in the magnet has changed, for example from
a magnet quenching while the power supply is turned off.
Persistent Switch Heater Current
The persistent switch heater current can be set from 1 to 125 mA. The switch heater is not turned
on until it is selected in the operating display or via a remote interface command.
Maximum Current Rating
This is the maximum current that the supply may output, regardless of the values of the upper or
lower current limits. It would normally be set to the magnet's maximum safe operating limit.
Gauss to Amp Ratio
This is entered in units of gauss per ampere. It is used to display the magnetic field instead of
output current if Field is selected in the Display Units menu item. It may be set to a whole number
ranging from 1 to 3000.
Quench Detection
The supply monitors the output current when quench detect is enabled. If a rapid decrease is
detected it assumes that a quench has occurred, and the supply is immediately placed in standby.
At this point the supply stops delivering any current to the magnet system, which in turn protects the
magnet's quench protection system. The Quench Detection setting allows this feature to be
disabled.
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