Xantrex Technology XDL 35-5TP manual Manual Operation, Main Outputs, Set Voltage

Manual Operation

Main Outputs

New users should first read the Initial Operation chapter which describes the operating principles of the keypad and rotary jog control. The following paragraphs describe the independent operation of either Main Output. To select which output is to be controlled by the keypad/Jog controls it is first necessary to select that output by pressing the appropriate CONTROL key (1 or 2); the key lights to show that it is the selected output.

The additional features available in LINK mode (both Main Outputs selected) are described in the Main Outputs – Link Mode section later in this manual.

Set Voltage

The left-hand display shows the set voltage to a resolution of 1mV, except when the instrument is in constant current (CI) mode. In CI mode the actual output voltage (which will be less than the set voltage) is shown and the display resolution is 10mV; the least significant digit (1mV resolution) is always displayed as a zero.

The voltage can be set directly from the numeric keypad: press the NUMERIC SET V key, enter the new value using the numeric keys and confirm by pressing OK. The broad principles of keypad entry are explained in the Initial Operation chapter, which should be read by new users.

When SET V is pressed the display shows 0·000; a new voltage is then entered (e.g. 12·345V is entered as 1, 2, ·, 3, 4, 5) and confirmed by OK. The position of the decimal point in the display is fixed to reduce the risk of entering a wrong value. As a consequence, and to avoid the need to enter leading zeroes (e.g. 2·345V is entered as 2, ·, 3, 4, 5, OK), numbers to the left of the decimal point are shown slightly differently to the numbers to the right of the decimal point during number entry; this is self-evident during number entry.

The minimum voltage setting is 0·000V; the maximum setting is 35·000V (15·000V on the 15V/5A range).

Pressing OK at any point will set the voltage entered with any remaining digits set to zero, e.g. 1, 2, ·, 3, OK will set 12·300V; 1, OK will set 1·000V; pressing OK immediately after SET V (while the display shows 0·000V) will set 0·000V.

Pressing ESCAPE at any time during the sequence, or making no further key press within

10 seconds of the previous one will cause the display to return to its original reading before SET V was pressed.

Entering a voltage outside the range maximum (including trying to enter 3 digits before the decimal point) or trying to enter more than 5 digits will cause the buzzer to beep twice; the last key entry will be ignored.

The voltage can also be set using the Jog control. Pressing JOG SET V will illuminate the V key and the JOG indicator under the digit that was last jogged will flash. Whilst the V key is lit, each further press will move 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. The jog steps that can be selected are 1mV, 10mV and 100mV.

With jog enabled the output voltage can be incremented or decremented with the rotary jog control with a step resolution indicated by the position of the flashing JOG indicator. The output immediately follows the setting, i.e. no OK is required. If the output goes into constant current mode (indicated by the CI indicator flashing) the left-hand display shows actual voltage not set voltage. If JOG SET V is selected the JOG indicator under the selected digit will flash at half speed ('lazy' flash). To observe the effect of jogging the set voltage it will be necessary to either turn the output off (so that the display permanently shows the set voltage) or to press

VIEW V/I LIMITS which causes the set voltage to be displayed until 3 seconds after movement of the jog control ceases.

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