User manual

68 GMC-I Messtechnik GmbH
Storage of Min-Max values activated
RST
Contents of Min-Max memory are reset, i.e. are replaced
with the momentary measured value for the
corresponding parameter:
Umin = Uout
Umax = Uout
Imin = Iout
Imax = Iout
Default setting after RESET (*RST): OFF
a) Manual Operation
See description on page 28.
b) Programming
Setting
Setting command:MINMAX status
Example (HP Basic):
OUTPUT 712;"MINMAX ON;MINMAX RST"
!Activate MINMAX function and
!overwrite stored Min-Max values
!with momentary measured values
Setting query
Query command:MINMAX?
Response string:MINMAX status
Possible response parameters (status):
"OFF" Storage of Min-Max values deactivated
"ON " Storage of Min-Max values activated
Fixed response string length: 10 characters
Example (HP Basic):
OUTPUT 712;"MINMAX?"
ENTER 712;A$
DISP A$
Display: MINMAX ON
Comment
The MINMAX function can be temporarily set to “OFF”, for
example before deactivating the output when changing devices
under test. Stored values are then no longer updated, nor are
they automatically reset.
Stored Min-Max values can be read out regardless of the status
selected for the MINMAX function.
Stored Min-Max values can always be reset with the MINMAX
RST command. Stored Min-Max values can also be reset with the
*RST command, or with the key combination <CE/LOCAL> +
<ENTER> (= RESET).
The status of the MINMAX function is saved to the setup registers
with the “SAVE” command.
If the POWER_ON function is set to “SBY” or “RCL”, the MINMAX
function is activated upon power-up, but previously measured
Min-Max values are lost when the device is switched off.
The MINMAX function can also be controlled via the trigger input
at the analog interface ( page 74 T_MODE).
MODE? – Querying the Momentary Control Mode
Functions
The device responds with the momentarily active operating mode
(control mode) in response to the MODE? query command.
Applications
In addition to evaluating the CRA condition register, the
momentary control mode can be directly queried with MODE?.
Syntax
MODE?
a) Manual Operation
See description in chapter 3.
b) Programming
Query command: MODE?
Response string: MODE control mode
Possible response parameters for mode:
"OFF" Output deactivated
"CV " Constant voltage regulation
"CC " Constant current regulation
"OL " Overload (power limiting)
Fixed response string length: 8 characters
Example (HP Basic):OUTPUT 712;"MODE?"
ENTER 712;A$
DISP A$
Display: MODE CV
OCP, OCP? – Overcurrent Protection
Functions
The OCP function specifies how the power output will respond if
load current climbs to the selected ISET value, i.e. if current
regulating is activated at the output.
Applications
As a rule, the OCP function is designed to protect interconnected
power consumers in the event of continuous overcurrent,
although, for example, intermittently high current is required:
– in order to maintain short response times when increasing
output voltage (capacitor charging current)
– as starting current for motors
– as in-rush current for capacitive consumers.
The OCP function also makes it possible to subject power
consumers to a selectable current value (ISET) for a precisely
defined period of time (DELAY), e.g.
– for testing the breaking performance of fuses, circuit breakers,
motor protecting switches etc.
– for determining the short-term load capacity of contacts and
cables, as well as electrical and electronic components.
Syntax
OCP status
Parameter
Status
One of the following text parameters can be selected:
OFF
OCP function deactivated:
continuous current limiting (current regulation)
ON
OCP function activated:
The output is deactivated as soon as the specified DELAY
period has elapsed after current limiting is triggered.
Default setting after RESET (*RST): OFF
a) Manual Operation
See description on page 26.
b) Programming
Set
Setting command:OCP status
Example (HP Basic):
OUTPUT 712;"OCP ON"
!Activate OCP function.
Setting query
Query command:OCP?
Response string:OCP status
Possible response parameters for (status):
"OFF" OCP function deactivated
"ON" OCP function activated