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GMC-I Gossen-Metrawatt GmbH
IFC – Resetting the IEC Bus Interface (interface clear)
Functions
The IEC bus interface at the device is re-initialized with the IFC
(INTERFACE CLEAR) bus interface command, and is returned to
the standard default settings.
Addressing status
Not addressed
Input and output buffers
Unchanged
Service request SRQ
Unchanged
Status byte register STB
Unchanged
Event registers ESR, ERA, ERB
Unchanged
Enable registers ESE, ERAE, ERBE, SRE, PRE
Unchanged
Set and stored parameters
Unchanged
Programming
Programming example (HP Basic):
ABORT 7
ILIM, ILIM? Current Setting Limit Value
Functions
ILIM defines the upper setting limit (soft-limit) for current setpoint
value ISET.
The limit can be used to assure that output current is not
inadvertently set above a specified value.
Syntax
ILIM
value
Parameter
Value
Parameter type:
real number
a) Manual Operation
b) Programming
Setting
Setting command:
IL
IM
value
Example (HP Basic):
OUTPUT 712;"ILIM 20"
!Current setting range limit: 20 A
Setting query
Query command:
IL
IM
?
Response string:
ILIM
value
Parameter format
value
:
+nnn.nnn
Fixed response string length: 13 characters
Example (HP Basic):
OUTPUT 712;"ILIM?"
ENTER 712;A$
DISP A$
→
Display:
ILIM +020.000
Comment
If an attempt is made to set ILIM to a value lower than ISET, the
setting command is not executed and bit 1 is set in event register
B (limit error), as is bit 4 in the standard event register (execution
error).
The ILIM function does not effect the adjustment of ISET by
means of a control signal via the analog interface.
IMAX? – Maximum Measured Current Value
Functions
The IMAX function reads out the highest output current value
which was measured by the IOUT measuring function and saved
to Min-Max memory while the MINMAX function was set to ON.
Syntax
IMAX?
Measuring range: current measuring range as per IOUT
If the measured current value has exceeded the
measuring range limit at least once with the MINMAX
function set to ON, “+OL” appears at the display for IMAX
and “+999999.” is entered to the data string. The Min-Max
memory value can be reset to the momentarily measured
value with MINMAX RST (for all 4 parameters at once).
a) Manual Operation
b) Programming
Measured Value Query
Query command:
IMA
X
?
Response string:
IMAX
value
Response parameter format
value
:
±nnn.nnn
Fixed response string length: 13 characters
Example (HP Basic):
OUTPUT 712;"IMAX?"
ENTER 712;A$
DISP A§
→
Display:
IMAX +045.440
Comment
IMIN? – Minimum Measured Current Value
Functions
The IMIN function reads out the lowest output current value which
was measured by the IOUT measuring function and saved to Min-
Max memory while the MINMAX function was set to ON.
Syntax
IMIN?
Measuring range: current measuring range as per IOUT
If the measured current value has fallen below the lower
measuring range limit at least once with the MINMAX
function set to ON, “–OL” appears at the display for IMIN
and “–999999.” is entered to the data string. The Min-Max
memory value can be reset to the momentarily measured
value with MINMAX RST (for all 4 parameters at once).
a) Manual Operation
b) Programming
Measured value query
Query command:
IMI
N
?
Response string:
IMIN
value
Response parameter format
value
:
±nnn.nnn
Device
Type
Setting Range
Step Size
Nom.
Current [A]
Min.
[A]
Max.
a)
[A]
a. However, ILIM cannot be set to a value of less than the momentary current
setpoint ISET.
Remote
b)
[A]
b. If the selected value is not a whole number multiple of the step size, it is
rounded off accordingly. If necessary, the numeric value is rounded off once
again for the 4-place digital display.
Manual
c)
[A]
c. Can be selected by (repeatedly) pressing the <RESOLUTION> key. The
blinking decimal place at the display indicates the selected step size.
12,5
0.00
12.50
0.001
0.01/0.1/1.0
25
0.00
25.00
0.001
0.01/0.1/1.0
50
0.00
50.00
0.001
0.01/0.1/1.0
75
0.00
75.00
0.001
0.01/0.1/1.0
100
0.00
100.0
0.001
0.01/0.1/1.0
150
0.00
150.0
0.001
0.01/0.1/1.0
Default setting after RESET (*RST): nominal current
