Agilent Technologies 66lxxA - page 74

Application Programs 75
MPS Set Up
Module in slot 0:
The module is connected to + 15 V on the DUT.
The initial voltage setting is 15 V.
The module monitors its status.
The module will generate a backplane TTL Trigger on CV-to-CC crossover.
The module listens for a backplane TTL Trigger.
The trigger delay is programmed to 15 ms.
Upon receipt of the trigger, the module waits the trigger delay time and then goes to 0 V.
Module in slot 1:
The module is connected to supply - 15 V to the DUT.
The initial voltage setting is 15 V
The module monitors its status.
The module will generate a backplane TTL Trigger on CV-to-CC crossover.
The module listens for backplane TTL Trigger.
The trigger delay is programmed to 15 ms.
Upon receipt of the trigger, the module waits the trigger delay time and then goes to 0 V.
Module in slot 2.
The module is connected to supply + 5 V to the DUT.
The initial voltage setting is 5 V.
The module monitors its status.
The module will generate a backplane TTL Trigger on CV-to-CC crossover.
The module listens for backplane TTL Trigger.
Upon receipt of the trigger, the module immediately goes to 0 V.
Variations On This Implementation
1. The modules could be set to generate SRQ when the last module reaches 0 V. This could notify the computer that power
has been removed from the DUT.
2. The modules could be set to generate a DFI (Discrete Fault Indicator) signal on the MPS rear panel on a change in status.
This signal could be used to shut down other power modules, to flash an alarm light, or to sound a buzzer. This could
also be routed to other instruments to signal them to stop making measurements.
3. To get all three modules to remove power from the DUT at the same time, simply eliminate the trigger delay on the ± 15
V modules.
4. To provide a delay between the removal of the three bias voltages, you can program a different trigger delay into each
module.