GMC-I Messtechnik GmbH
43
ADJUST – Balancing / Calibration Function
Menu
Function
Attention!
!
This procedure replaces directly the reference parame-
ters referring to the accuracy of the Konstanter. Please
check carefully before starting this procedure.
The factory settet adjustment was done with high pre-
cise instruments as shown in DAkkS calibration certifi-
cate.
When starting the adjust function, the right display shows the last
presetted calibration date (format Y.MM.DD)
Attention!
!
This procedure may only be executed if no other power
consumers are connected. They might otherwise be
damaged, because the upper range limits are read out
automatically (OUTPUT ON).
The entire procedure can be executed either manually or
PC controlled.
The following parameters can be balanced with this procedure:
Voltage setpoint USET (offset value and upper range limit) and
measured voltage value UOUT (offset value and upper range limit).
Current setpoint ISET (offset value and upper range limit) and
measured current value IOUT (offset value and upper range limit).
Sufficiently accurate measuring instruments for voltage and cur-
rent are required for this procedure. The measured values must
be entered as parameter W during the respective balancing step,
either at the keypad or at the PC.
Appropriate error messages are generated and displayed as
UNCAL
if balancing fails or if it is interrupted with the
ADJUST EXIT
command.
ADJUST Procedure
The following sequence must be adhered to:
Uoff (offset value), Ufs (upper range limit), Ioff (offset value), Ifs
(upper range limit)
Setting Commands
Voltage offset
Syntax:
ADJUST Uoff
The Konstanter selects a small voltage offset value.
Read measured value
w
at the measuring instrument and transmit
it to the Konstanter with the following command.
Syntax:
ADJUST Uoff, w
Upper voltage range limit
Syntax:
ADJUST Ufs
The Konstanter sets output voltage to the upper range limit. Read
measured value
w
at the measuring instrument and transmit it to
the Konstanter with the following command.
Syntax:
ADJUST Ufs, w
Current offset
Syntax:
ADJUST Ioff
The Konstanter selects a small current offset value.
The Konstanter must be short circuited via the ammeter or
connected to a suitable resistive load for current balancing.
Attention!
!
Change the test setup for current measurement with a
suitable ammeter. The measuring instrument must be
capable of processing the maximum occurring current
value.
Read measured value
w
at the measuring instrument and transmit
it to the Konstanter with the following command.
Syntax:
ADJUST Ioff, w
Upper current range limit
Syntax:
ADJUST Ifs
The Konstanter selects a small voltage offset value.
Read measured value
w
at the measuring instrument and transmit
it to the Konstanter with the following command.
Syntax:
ADJUST Ifs, w
After the procedure has been completed, the date from the
internal clock is saved as a balancing date.
An error message is generated when the procedure is aborted or
an error has occured. In the adjust menu an
UNCAL
is displayed
instead of the adjust date. The adjust parameters are replaced by
internal default values.
The
*TST?
query generates a „1“.
After a new „power on“ the last active adjust parameters including
its actual date are refreshed and becomes active.
The
*TST?
query generates a “0”.
Interrupting the balancing procedure
Syntax:
ADJUST EXIT
ANALOG_IN, ANALOG_IN?
– Connection of Analog Control Inputs Uext, Iext (Uset, Iset)
Menu
Function
This command allows for direct or linked connection of the analog
control inputs for voltage and current.
The txt1 parameter determines the switching parameter for the
Uext input, and the txt2 parameter applies to the Iext input.
The control inputs at the analog interface can be switched directly
with the OFF and ON parameters.
The “ON/OFF” switching status can be set indirectly by entering
the “SSET” parameter to the ANALOG_IN setting command,
depending upon FSET (with the sequence function) or the SSET
command.
When the switching statuses are queried, the momentary
switching status, namely ON, OFF or SSET, is always returned as
a response.
Note:
While the PSET function is active, command signals Uext
and Iext cannot be activated.
Setting Command
Syntax:
ANALOG_IN txt1,txt2
Parameter txt1/txt2:
OFF/ON/SSET
Default setting
or after RESET (*RST): OFF
Query Command
Syntax:
ANALOG_IN?
Sample response string:
ANALOG_IN
OFF, OFF
Summary of Contents for P1500
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