User manual

20 GMC-I Messtechnik GmbH
2.4.3 Toggled Transient Mode
The trigger function is required for toggled transient operation. As long as no trigger occurs, the load remains at transient low level.
After a trigger has been received, a toggle operation will be executed, and high transient level will be reached after the duration of rising
edge. The load will keep this level until a new trigger is received. Once this happens, the load will return to transient low level after the
duration of falling edge. The load will switch between the levels each time a trigger is received.
The associated parameters such as
– low level (LevelL),
– high level (LevelH),
– time for rising edge (TimeR),
– time for falling edget (TimeF) and
– toggled transient mode (toggle)
can be set through transient operation menu or via remote command
– (CURRent:LLEVel <NRf+>,
– CURRent:HLEVel <NRf+>,
– VOLTage:LLEVel <NRf+>, VOLTage:HLEVel <NRf+>,
– RESistance:LLEVel <NRf+>,
– RESistance:HLEVel <NRf+>,
– TRANsient:RTIMe <NRf+>,
– TRANsient:FTIMe <NRf+>,
– TRANsient:MODE TOGGle).
Low level time (TimeL) and high level time (TimeH) have no influence on toggled transient mode.
The trigger can be an external trigger signal received via the TRIG input on the front panel, pressing the
key and key,
or via the GPIB GET function, the common command *TRG or the subsystem command TRIG.
For example: assume that the CCH range is active, and the input is in OFF status, then the transient parameters should be set as fol-
lows:
Press the key to enter into transient operation.
Press the key to open transient operation menu.
Set the following parameters in transient operation menu:
Then press the key to turn on the input.
Alternatively, set the parameters via remote command:
Get the trigger by receiving an external trigger signal. Figure 2.8 shows the current waveform of the load before it is triggered and after
it has been triggered respectively: the electronic load starts its operation at the transient low level (5A) when the input is turned on. For
the first trigger, the load current reaches and remains at the high level (10A) after 100 μs duration of rising edge. When the second trig-
ger is received, the load current will reach and remain at the low level (5A) after 200 μs duration of falling edge. Each trigger leads to
one toggle operation.
LevelL 5.000 A
LevelH 10.000 A
TimeR 0.10 ms
TimeF 0.20 ms
Mode Togg
SCPI Command Description
TRIG:SOUR EXT Selects the external trigger input
TRAN ON Enables transient operation
TRAN:LLEV 5 Sets transient current low level to 5A
TRAN:HLEV 10 Sets transient current high level to 10A
TRAN:RTIM 100us Sets the time for transient rising edge to 100 μs
TRAN:FTIM 200us Sets the time for transient falling edge to 200 μs
TRAN:MODE TOGG Selects toggled operating mode
INPUT ON Turns on the input