12
Pressing SHIFT illuminates the
▲ lamp and gives the numeric keys the functions marked above
them, e.g. STR (Store), RCL (Recall), etc. When a shift function is selected SHIFT is cancelled
(the
▲ lamp is no longer lit). The further key presses required to complete the selected function
are described in detail in the sections that follow; if no key is pressed within 10 seconds to
complete the function, the function will terminate as if ESCAPE has been pressed. SHIFT is a
toggle key; pressing SHIFT again when it has been selected will cancel SHIFT. SHIFT is also
cancelled by ESCAPE, or by pressing SET V or SET I.
Jog Control
The rotary 'jog' control permits the output voltage or current limit to be incremented or
decremented in steps with a resolution set by the JOG SET keys; the output immediately follows
the setting, i.e. no OK is required.
Press CONTROL 1 or 2 to select the output to be adjusted. At power-up jog is always off. To jog
the voltage or current setting press the V or I JOG SET key; the associated lamp will illuminate and
the appropriate parameter display now changes to two lines. With the output ON the top line
continues to show the actual output, but the additional lower display now shows the present
Limits
value; in the lower display, the JOG indicator ( ) is positioned under the digit that was last
jogged. Whilst the V or I JOG SET indicator is lit, each further press of the V or I key moves the
JOG indicator one digit to the left; the selection 'wraps-round' such that when the largest value of
jog increment has been reached the next press returns it to the lowest. The default position at
power-up is under the LSD, i.e. the lowest jog increment is selected.
Turning the rotary jog control clockwise/anti-clockwise increments/decrements the selected digit;
digits to the left of the one being jogged are automatically incremented/decremented when the
decade overflow/underflow point is reached. Digits to the right of the one being jogged remain
unchanged unless the jog step overflows/underflows the maximum/minimum settings in which
case they are set to zero. For example, 59·861V goes to 59·961V goes to 60·000V for a 0.1V jog
increment; 1.60A goes to 0·60A goes to 0·01A for a 1A jog decrement.
The jog steps that can be selected are 1mV, 10mV, 100mV and 10mA, 100mA, 1A.
To disable the jog rotary control press the JOG SET OFF key; reselecting JOG SET V or I will
enable jog on the last used digit position. Jog is not cancelled by using numeric entry or any of the
SHIFT functions but it is disabled whilst that function is enabled. Jog is disabled when control is
switched to the other output using the CONTROL 1 or 2 keys but is automatically enabled again
when control is switched back.
Note that the dual display of the parameter being jogged is primarily of use if the output is ON; with
the output off both lines of the display show the
Limits
value and change simultaneously as the
parameter is jogged.
Display
At power-up the display briefly shows the instrument model number and installed firmware revision
in the left-hand display before both displays revert to the standard status display.
The standard status display shows the voltage range and output voltage on the left (above the
front panel VOLTS marking) and the current on the right (above the front panel AMPS marking)
together with the present output status, i.e.
OFF
,
CV
,
CI
, or
UNREG
; if the output is off then
Limits
is also shown in the display above the V and I values. The status of the LAN connection
is also shown in the top left corner of the display, as required for LXI compliance. Refer to the
'LAN Status Indication' paragraph in the LAN Interface section for details. During other operations,
however, the display capabilities are used more extensively to show, for example, prompts during
function settings, e.g. memory store and recall operations or the extra functions accessed via the
#
shift function; details are given in the relevant sections of this manual.
The display contrast is set at the factory but can be adjusted from the keyboard to optimise it for
particular ambient operating conditions. Press SHIFT, # , select Extra Function 90, and follow the
on-screen prompts. Contrast can be adjusted independently for the two displays.
