HMC Electronics MDL Series BK Precision DC Electronic Load System Module - Manual (Page 34)

34
External Trigger Connections
There are five kinds of trigger modes:
1)
Front panel TRIG trigger mode
2)
Rear panel trigger mode
3)
BUS trigger mode
4)
Timer trigger mode
5)
Hold trigger mode
Setting these modes is done through the System menu (Shift + ⑦) under <Trigger Source>. Press
Enter to confirm setting and Esc to exit menu.
Trigger Modes
1)
To use front panel trigger mode, first set the trigger source as MANUAL. Press Trig to start
panel trigger mode.
2)
To use rear panel trigger mode, first set the trigger source as EXTERNAL. Inputting a TTL
level pulse (>10 us) to the trigger signal input (pin 1) of mainframe’s Mainframe 8-pin
Control Connector on the rear panel will enable a trigger operation. The following figure
shows one way to produce a trigger signal.
When making contact with a TTL pulse source, it produces a trigger to change the setting
value (voltage, current, resistance, etc.), e.g. switch in transient mode, or create a pulse in
dynamic pulse mode. At the same time, it will output a trigger signal on pin 2.
3)
To use BUS trigger mode, first set the trigger source as BUS. Connect the electronic load by
GPIB, USB, or Ethernet communication interface. When the TRIG command is received, the
load will produce a trigger signal.
4)
To use timer trigger mode, first set the trigger source as TIMER. Set the TRIGGER TIMER's
time, and the electronic load will trigger at specified trigger timer setting and also produce
a trigger signal on rear Trigger Out pin.
5)
To use hold trigger mode, first set trigger source as HOLD. Then send the TRIG:IMM
command to trigger the electronic load. Pin 2 of 8-pin Control Connector on the rear will
also output a corresponding trigger signal when the electronic load receives the TRIG:IMM
command.
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440