User manual

GMC-I Gossen-Metrawatt GmbH 15
4 Adjusting Output Values
4.1 Output Voltage
4.1.1 Uout – Presently Measured Voltage Value
• The left-hand digital display [4] <Volt> indicates the measured
value Uout for voltage present at the output terminals.
• During sensing mode operation, the displayed value
corresponds to voltage acquired from the sensing leads
at the consuming device.
• The 3½ place measured value display is refreshed approxi-
mately 3 times per second. Overflow is indicated for measured
values of greater than 19.99 at 20 V devices.
• If output voltage is superimposed with an alternating voltage,
the arithmetic mean value is displayed.
☞ Refer to chapter 1.4.3, Electrical Data, regarding measuring
range, measuring resolution and measuring accuracy.
4.1.2 Ulim – Limit Value for Uset
Function
• Defines the voltage adjustment setting range <Uset> [8]
• Prevents inadvertent, excessively high voltage setpoint values
(Uset) during manual operation.
• If Ulim is set to 0 V (full left), the voltage adjusting
potentiometer <Uset> is disabled (e.g. for adjustment of output
voltage by means of the analog interface).
Setting Ulim
• Ulim is adjusted with the left-hand trimming potentiometer [7]
<Ulim>.
• Use a size 3 screwdriver only in order to avoid damaging the
potentiometer.
• Deactivate the output: <OUTPUT> ”OFF”.
• First set Uset to its maximum value (turn potentiometer [8] <Uset>
clockwise as far as it will go).
• Press the key [9] <DISPLAY Uset/Iset>.
• The left-hand display [4] <Volt> is switched from the presently
measured voltage value Uout to the manually selected voltage
setpoint Uset.
• Hold this key depressed.
• At the same time, turn <Ulim> [7] with the screwdriver until <Volt>
appears at the display [4] as the selected voltage for Ulim.
• To increase voltage:Turn clockwise
• To decrease voltage: Turn counterclockwise
• The selected voltage is now the maximum voltage value to which
Uset can be adjusted manually.
Setting Range
• The <Ulim> potentiometer can be turned 270°, which
corresponds to a setting range of 0 V ≤
Ulim ≤ Unom.
• The 10 revolutions which are possible with the <Uset> rotary knob
[8] always correspond to a range of 0 V to Ulim.
4.1.3 Uset – Voltage Setpoint Value
Function
• Predefined voltage at which the consuming device is to be
operated
Adjusting Uset
• Uset is adjusted with the left-hand rotary knob [8] <Uset>.
• First press the key [9] <DISPLAY Uset/Iset>.
• The left-hand display [4] <Volt> is switched from the presently
measured voltage value Uout to the manually adjusted voltage
setpoint Uset.
• Hold this key depressed.
• At the same time, turn the rotary knob [8] <Uset>.
• To increase voltage:Turn clockwise
• To decrease voltage:Turn counterclockwise
• If the output is activated <OUTPUT> “ON”, output voltage is
adjusted directly by turning rotary knob.
• If the output is deactivated <OUTPUT> “OFF”, no voltage is present
at the output during adjustment. Voltage is not applied to the
output until it is activated <OUTPUT> “ON”.
• After releasing the key [9] <DISPLAY Uset/Iset>, the display [4] is
switched back to the measured value for output voltage Uout.
CAUTION!
The Uset value can also be changed when the KONSTANTER is not in
operation.
Setting Range
• The rotary knob can be turned 10 revolutions.
• The 10 revolutions which are possible with the <Uset>
potentiometer [8] always correspond to a range of 0 V to Ulim.
• The selection of a low value for Ulim allows for “finer” adjustment
of the Uset value.
The setting accuracy specified in chapter 1.4.3 makes reference
to the respectively displayed setpoint value.
• 19.99 is the highest value which can be displayed for Uout and
Uset with 20 V devices.
The A-D converter generates an overflow display for values
beyond this limit: