American Magnetics 420 Power Supply Programmer - Manual (Page 56)

38 Rev. 7
Operation
Entering Values
The operating (shunt) current is displayed in Amperes and may
alternately be displayed as estimated field in kilogauss (or Tesla) in
display mode 3 or 4 if a coil constant has been specified in the setup (see
paragraph 3.2.2.2). V
s indicates the commanded output voltage of the
power supply in volts. V
M
indicates the voltage measured across the
terminals of the connected superconducting magnet.
The ramping mode character
is always visible (except
during a quench condition)
and is displayed just to the
right of the operating current
or field display. The ramping
mode character may be one of
five states as shown in Table
3-1.
If the ramping mode
character is blank, then a
quench condition exists. See
paragraph 3.3 for a detailed
discussion of the meaning of
the ramping modes.
3.1.1 Entering Numerical Values
A consistent method of entering values is used within menus requiring
numerical entries. Once a menu is selected, the user starts an entry by
pressing a digit, the decimal key, or the sign (
 ) key. The display will
begin a new entry and display a cursor B as a prompt for the next digit or
decimal entry. Once entry is initiated, the display will show an asterisk
indicating that entry is in progress. To accept the entered value, press the
(17(5 key. Values are not applied to the operation of the instrument
until the (17(5 key is pressed and the asterisk disappears from the
display. An example of an entry in progress is illustrated below:
If the (6& key is pressed once while entry is initiated, the entered digits
will be cleared and the cursor will remain for reentry of a new desired
value. If the
(6& key is depressed twice, the setting will revert to the
previous value and the entry is cancelled.
Table 3-1. Description of
ramping mode characters.
P
Paused
a
a. Displayed in reverse video.
↑
Ramping Up
↓
Ramping Down
– Holding
°
Heating Persistent Switch
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 9V B