1-4
IM 2558A-01EN
DEVIATION/PRESET Section
The DEVIATION/PRESET section consists of two deviation dials, a 4-digit DEVIATION display, a
PRESET switch, and a preset indicator.
Deviation dial 1
Sets the tenths digit of the deviation value display
Deviation dial 2
Sets the hundredths digit of the deviation value display. You can turn this dial with less torque.
DEVIATION display
Displays the deviation in reference to the main setting
Preset value indicator
Displays the deviation value set with the PRESET switch
PRESET switch
Set the deviation in reference to the main setting.
The deviation dial sets the number of each digit in the range of 0 to 9. Dial 1 changes the number in
increments of 2; Dial 2 changes the number in increments of 1. Carrying over and borrowing occurs
automatically up to ±20%. If the upper or lower limit of the range is reached, turning the dial further will
not change the number.
SWEEP Section
The SWEEP section consists of a SWEEP switch and a pair of UP and DOWN indicators for indicating
the sweep direction.
UP indicator
Illuminates when sweeping up
DOWN indicator
Illuminates when sweeping down
SWEEP switch
UP sweep
Flip the switch up to sweep up. Flipping the switch down
while sweeping up stops the sweeping (HOLD state).
DOWN sweep
Flip the switch down to sweep down. Flipping the switch up
while sweeping down stops the sweeping (HOLD state).
OUTPUT Section
The OUTPUT section consists of a OUTPUT switch and a pair of ON and OFF indicators.
ON indicator
Illuminates when voltage or current is being generated
OUTPUT switch
Local mode
Flip up to turn the output on.
Flip down to turn the output off.
Flipping this switch down in remote mode (controlled through
communications) causes the 2558A to switch to local mode.
OFF indicator
Illuminates when voltage or current is not being generated
1.2 Dial and Switches
