The DG2A Train Delay Generator small free-standing instrument has been designed for control of normal repetitive stimulation as well as for defining the Effective Refractory Period using a second, delayed pulse. The DG2A is especially useful as a frequency generator.

DS3 and DS7A isolated stimulators which have their own pulse duration controls can be used with our DS2A Train Generators and Delay Generators. The basic features of its predecessor the DG2 Trigger Generator are still included and have been extended to allow trains of pulses to be generated in response to input signals from other devices.

The DG2A Train/Delay Generator has four operating modes which are detailed below:

1. Train – In TRAIN mode, a regular button press or TTL compatible trigger received at the IN socket of the DG2A is translated into a SYNC pulse train with a pulse repetition rate and train duration determined by the REPETITION and DURATION settings. The DELAY dial allows the introduction of a delayed pulse after each SYNC pulse which can be detected at the OUT-1/OUT-2 output.
2. Gated – In GATED mode, the DG2A will output a train of pulses at the SYNC socket while the input at the IN socket is TTL high. This allows the operator to GATE the train of pulses on and off with an external device. The pulse repetition rate is determined by the REPETITION setting. The DURATION control has no function in this mode. The DELAY dial allows the introduction of a delayed pulse after each SYNC pulse, which can be detected at the OUT-1/OUT-2 output.
3. Free-run – In FREE-RUN mode, the DG2A will continuously output SYNC pulses with a pulse repetition rate determined by the REPETITION setting while the unit is ON. The DURATION control has no function in this mode. The DELAY dial allows the introduction of a delayed pulse after each SYNC pulse which can be detected at the OUT-1/OUT-2 output.
4. Single – In SINGLE mode, a single TTL compatible trigger received at the IN socket or push-button press is translated into a single SYNC pulse. The REPETITION and DURATION controls have no function in this mode. The DELAY dial allows the introduction of a delayed pulse after each SYNC pulse which can be detected at the OUT-1/OUT-2 output part of the DG2A.