User manual

GMC-I Messtechnik GmbH 81
Selecting the Adjustment (calibration) Function
The KONSTANTER is operated in the standard operating
mode.
23 Press the <FUNCTION> key once in order to access the
function groups menu.
24 Repeatedly press the <FUNCTION> key until the CAL function
group appears at the display.
25 If CAL appears at the left-hand display, press the <ENTER>
key to access the adjustment (or calibration) function.
Setting the New Adjustment Date
26 At first, date appears at the left-hand display, and the date of
last adjustment appears at the right-hand display.
27 Select today’s date with the <> key or the <> key.
28 After setting the date, press the <ENTER> key.
The date is saved and the following message appears at the
display: CAL Strt. Strt blinks.
Starting the Adjustment (calibration) Routine
29 Press and hold the <ENTER> key for at least 5 seconds in order
to start the adjusting (calibration) routine.
If the <ENTER> key is held depressed for less than 5
seconds, the device is automatically returned to its default
setting.
If this is the case, press the <FUNCTION> key once again, in
order to return to CAL Strt.
Adjusting Offset Voltage and Full-Scale Voltage
30 MEAS UoFF blinks at the display (measure offset voltage). The
KONSTANTER is ready to display offset voltage.
31 Press the <ENTER> key.
UoFF appears at the left-hand display, and the voltage value
measured by the KONSTANTER appears at the right-hand
display (0.5% of U
nom
).
The blinking digit indicates the smallest adjustable decimal .
The CV and OUTPUT LEDs light up, and the output is active.
Compare the UoFF value with the value displayed at the
external measuring instrument.
If these two values are different, set the KONSTANTER to the
value measured by the external measuring instrument with
the <> key or the <> key.
32 Save the corrected UoFF value to the KONSTANTER by
pressing the <ENTER> key.
After pressing the <ENTER> key, MEAS UFS blinks at the
display (measure full-scale voltage).
33 Press the <ENTER> key.
UFS appears at the left-hand display, and the voltage value
measured by the KONSTANTER appears at the right-hand
display (95% of U
nom
).
The blinking digit indicates the smallest adjustable decimal
place.
Compare this value with the value displayed at the external
measuring instrument.
If these two values are different, set the KONSTANTER to the
value measured by the external measuring instrument with
the <> key or the <> key.
34 Save the corrected UFS value to the KONSTANTER by
pressing the <ENTER> key.
MEAS IoFF appears at the display.
Adjusting Offset Current and Full-Scale Current
35 The KONSTANTER must be set to the current regulating mode
in order to adjust offset current and full-scale current!
Increase load to this end, or short circuit the output. The CV
LED goes out, and the CC and OUTPUT LEDs light up.
MEAS IoFF blinks at the display (measure offset current). The
KONSTANTER is ready to display offset current.
Press the <ENTER> key.
IoFF appears at the left-hand display, and the current value
measured by the KONSTANTER appears at the right-hand
display (0.5% of I
nom
).
The blinking digit indicates the smallest adjustable decimal .
Compare this value with the value displayed at the external
measuring instrument.
If these two values are different, set the KONSTANTER to the
value measured by the external measuring instrument with
the <> key or the <> key.
36 Save the corrected IoFF value to the KONSTANTER by
pressing the <ENTER> key.
After pressing the <ENTER> key, MEAS IFS blinks at the
display (measure full-scale current).
37 Press the <ENTER> key.
IFS appears at the left-hand display, and the current value
measured by the KONSTANTER appears at the right-hand
display (95% of I
nom
).
The blinking digit indicates the smallest adjustable place.
Compare this value with the value displayed at the external
measuring instrument.
If these two values are different, set the KONSTANTER to the
value measured by the external measuring instrument with
the <> key or the <> key.
38 Save the corrected IFS value to the KONSTANTER by
pressing the <ENTER> key.
Ending Adjustment of the KONSTANTER
39 CAL End appears at the display after acknowledging the last
selected current value.
Exit the adjusting function by pressing the <ENTER> key.
40 All of the adjustment values are now stored to memory.
SEt appears at the left-hand display. The device is returned
to the function groups menu.
A new function group can now be selected with the
<FUNCTION> key, or the menu can be exited by pressing the
<CE/LOCAL> key in order to return to the standard display.
Manually Aborting the Adjusting Routine Prematurely
If, during one of the adjusting steps, you discover that
deviation between the measured values from the
KONSTANTER and the external measuring instrument will be
too large (making adjustment impossible) adjustment can be
aborted prematurely in order to retain the previous
adjustment values.
41 Repeatedly press the <CE/LOCAL> key until CAL appears at
the left-hand display.
The display is returned to the beginning of the adjusting
routine.
42 Press the <CE/LOCAL> key once again in order to exit the
adjusting function and return to the function groups menu.
Automatic Adjustment Abort Triggered by the KONSTANTER
43 If the KONSTANTER is unable to execute adjustment
because measured value deviation is too great, the
adjustment values are not saved to memory in the last step
of the adjusting routine.
The KONSTANTER returns itself to the UNCAL status,
activates default values (not previous adjustment values) and
exits the adjusting function. In addition, each time the
KONSTANTER is switched on the Cal error flag is set.