Jog Control; Display - TTI QL Serie Manual De Instrucciones

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 (QL355); 56V/2A, 25V/4A, 56V/500mA (QL564); 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 (QL355P & QL564P 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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