Fuse drawer
74
CHAPTER 6:
Service
Model 648 Electromagnet Power Supply
6.8 Factory Reset
Menu
It is sometimes necessary to reset instrument parameter values or clear the contents
of curve memory. Both are stored in nonvolatile memory called NOVRAM, but they
can be cleared individually. Instrument calibration is not affected except for room
temperature calibration, which should be recalibrated after parameters are set to
default values or any time the thermocouple curve is changed.
6.8.1 Default Values
The factory defaults can be reset, and the user curves cleared, using the Factory Reset
menu. To access the Factory Reset menu, press and hold the
Escape
key for 5 s. Once
the menu appears, set either Reset to Defaults or Clear Curves, or both, to Yes, then
highlight Execute and press
Enter
..
Default parameter values
Output settings
Output current*
0 A
Current ramp rate
50.000 A/s
Maximum settings
Max output current
135.1 A
Max ramp rate
50.000 A/s
External program mode
External program mode
Internal
Ramp segments
Ramp segments
Disabled
Ramp segments current
0 A
Ramp segments rate
1.0000 A/s
Display
Brightness
25%
Keypad locking
State
Unlocked
Lock code
123
Computer interface
Baud
57,600
IEEE-488 address
12
IEEE-488 terminators
CR/LF
Mode*
Local
Water settings
Magnet water
Disabled
Internal water
Disabled
* Indicates value is also initialized on power up
6.9 Error
Messages
Error messages appear on the lower part of the instrument display when it identifies
a problem during operation. The Fault LED will light in conjunction with the error
message. Press
Status
to see a more extensive description of the error message. If the
error condition can be immediately cleared, you can do so by pressing
Status
while in
the error status display. Refer to section 4.15 for a description of the error status
display.
6.9.1 Types of Error
Messages
There are three types of error messages. Their descriptions are defined here and in
TABLE 6-2 and TABLE 6-3.
FIGURE 6-5
TABLE 6-10
