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Operation
Use the Prog keys (VOLTAGE, FREQUENCY/PHASE, and CURRENT/POWER) to
enter program mode. Any time during programming one parameter type, press one of
the other program keys to save the results of the present program operation and shift
over to a new program type.
While programming a value, press the ENT (Enter) key or the presently lit program key
to save the present program value and terminate the programming operation. When
programming in DC or ACDC modes, the number entered on the keypad can be sign
adjusted by pressing the I/W/VA/PF/CF key. After pressing the +/– key, the display will
show the '–' sign at the start of the displayed number to indicate a negative voltage
value. The sign is not toggled. Press ENT without the +/– key to enter a positive
number.
The programming process incorporates a timeout feature. If a key is not pressed within
10 seconds after entering program mode, the program operation is aborted and the
system reverts to readback mode.
In program mode, use the arrow keys to adjust a number displayed. The digit being
adjusted will be brighter than the other numbers displayed. The Up arrow will increment
the number if the change doesn't push the number out of range. The setpoint will be
changed and the output will be affected immediately.
NOTE: When using arrow keys to adjust a programming value up or
down, the change made is immediate and final. The output will
reflect the changes.
In program mode, use the number keys to specify an absolute value. If any program
key is pressed after entering numbers to the display, the value entered will be range
checked and applied to the output. Note that the only way to abandon a keyboard entry
is to let the program sequence time out or to press the CANCEL key twice.
If a program value entered at the keyboard is out of range, the display flashes the
maximum allowable value. After flashing, the program operation will be aborted.
The program keys can be disabled or "locked" using the menu system or GPIB/RS-232.
Once the program keys are locked, the Lock LED is illuminated and the TW cannot be
programmed via the front panel keys. The programming keys can be unlocked by
means of the GPIB/RS-232 command interface or by the menu system described later
in this manual.
The TW will source to its output when the Output LED is lit. The output is toggled on
and off with the Output key or through SCPI.
The Remote LED lights as soon as a GPIB/RS-232 command has been received and
processed.
3-4
TW 3700 • TW 5550
Elgar TrueWave
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