Publicidad
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.
At power-up jog is always off. To jog the voltage or current setting press the V or I JOG SET key;
the key will illuminate and the JOG indicator under the digit that was last jogged will flash. Whilst
the V or I JOG SET key 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 range maximum/minimum in which case
they are set to zero. For example, 33·65V goes to 34·65V goes to 35·00V for the 35V range and
a 1V jog increment; 0·160A goes to 0·060A goes to 0·001A for a 0·1A jog decrement.
The jog steps that can be selected are 1mV, 10mV, 100mV and 1mA, 10mA, 100mA; if the
500mA range has been selected the current increment steps are 0·1mA, 1mA, 10mA.
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.
When in constant voltage mode with the output on the right-hand display will show actual current
rather than current limit. If JOG SET I is selected the JOG indicator under the selected digit will
flash at half-speed ('lazy' flash). To observe the effect of jogging the current limit it will be
necessary to either turn the output off (so that the display permanently shows the current limit) or
to press VIEW V/I LIMITS which causes the current limit to be displayed until 3 seconds after
movement of the jog control ceases. The 'lazy' flash is also used when JOG SET V has been
selected and actual voltage is being shown because the supply has gone into current limit.
The factory default is to flash the JOG indicator under the selected digit for the whole time that
jog is selected so that the user is constantly reminded which parameter can be incremented/
decremented. Where this degree of reminding is considered inadequate the user can select,
using the Extra Functions capability, to flash the digit itself; conversely, where the flashing is
considered intrusive the user can select to not flash the JOG indicator (except when the 'lazy'
flash is shown).
Display
The display shows the voltage on the left (5 digits) and the current on the right (4 digits). These 7-
segment displays are also used to show prompts during the some of the function settings (e.g.
memory store/recall or remote control address setting) using the limited 'character set' that can be
achieved with a 7-segment display; these are necessarily a mixture of upper and lower case
letters.
Above and below the 7-segment display are several secret-until-lit annunciators. To the right,
above the current display, are the indicators which show the selected operating range:
35V/3A, 15V/5A or 35V/500mA (XDL 35-5); 56V/2A, 25V/4A, 56V/500mA (XDL 56-4); the
indicators light beneath the range printed immediately above them and, in the case of the 500mA
range, the indicator is marked mA to emphasise that the current display is now showing mA. The
other annunciators above the displays are:
CI, indicating that the instrument is in constant current mode; LIM, which flashes when the
VIEW V/I LIMITS key is pressed to show the set voltage/set current limit in the display; REM,
which lights when the instrument is under control from a remote interface (XDL 35-5P &
XDL 56-4P only).
Below the three least significant digits of both the voltage and current displays are the JOG
indicators; the appropriate indicator flashes when the jog function is being used, see the Jog
Control section above.
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