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Home Electrophysiology Products Stimulators Train Delay Generators


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Train Delay Generators

The DG2A is a compact, free-standing, battery powered instrument which can be used to generate trigger pulses required for repetitive stimulation. Also featuring DELAY controls, it is useful for determining nerve or axonal Effective Refractory Period (ERP) through the production of a delayed second pulse.
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Item# Description
650641 Train Delay Generator DG2A

For local pricing, contact your nearest distributor.



Full Description Back to Top

• Trigger timing generator
• Ideal for electrophysiology
• Perfect match for DS2A and DS3
• Internal battery

The DG2A is a compact, free-standing, battery powered instrument which can be used to generate trigger pulses required for repetitive stimulation. Also featuring DELAY controls, it is useful for determining nerve or axonal Effective Refractory Period (ERP) through the production of a delayed second pulse.

Various modes allow output pulses to be produced singularly (SINGLE), continuously (FREE-RUN & GATED) or in a burst (TRAIN), with the burst/train duration and pulse frequency determined by the front panel controls. In each of the modes (except FREE-RUN), outputs can be initiated either by the front panel push button, a TTL compatible trigger/gating pulse or a suitable foot switch.

The unit has control of train duration over three full decades, pulse repetition rate (or frequency) within that train over five decades and control of the delayed pulse over three decades. It has two BNC output sockets (i) the SYNC output produces a pulse to trigger recording devices or synchronize other equipment and (ii) the OUT output produces either a delayed version of the same or by toggle switch selection, pairs of delayed and non-delayed pulses (as would be necessary for ERP studies).

The unit is especially suitable for use with our DS2A Isolated Constant Voltage and DS3 Isolated Current Isolated Stimulators which have their own Pulse Duration controls.

The instrument is powered by an internal 9V battery (PP3 - 6R61 style) and replaces our DG2 Trigger Generator.

A mounting frame (part number BS4 65-0337) is available so that two units of either DG2A, DS2A or DS3 can be mounted in 19” rack. See page H53 for DS2A and DS3 stimulators. The unit always produces a pulse to synchronize other equipment at SYNC and a pulse delayed from SYNC by DELAY controls. Note: No other accessories, other than a battery, are supplied.


Specifications Back to Top

Specifications650641
CertificationsCE
Height Metric110 mm
Height English4.3 in
Width Metric188 mm
Width English7.4 in
Depth Metric60 mm
Depth English2.4 in
Weight Metric490 g
Weight English17.3 oz
Modes: Control FunctionsFour position rotary switch
Modes: SINGLEInput signal triggers a single Output pulse
Modes: FREE-RUNContinuous Output pulses as set by REPETITION controls
Modes: GATEDInput signal enables unit to produce pulses as set by REPETITION controls
Modes: TRAINInput signal Triggers unit to produce pulses as set by REPETITION controls for the time as set by the DURATION controls
Input: ConnectorBNC socket
Input: LevelsTTL high (>1.5 V), TTL low (<0.8 V)
Input: PolarityActive High (GATE/TRAIN) and Positive edge (SINGLE) or Active Low and Negative edge by Internal Jumper
Input: Internal JumperEnable “Active Low” - allowing for an Input that is Low during its active phase
Input: Push-buttonHas same function as a valid input signal
Input: Indicator“TOO FAST” Red LED that flashes if a Trigger is received while the unit is busy
Duration: Total Range10 msec - 12 sec in three overlapping ranges
Duration: ControlSingle turn control marked 1 – 12 sec with intermediate integer panel marks
Duration: Accuracy±1% at ‘1’ and ‘12’ marks, ±5% at intermediate marks
Duration: Multiplierx0.01 ; x0.1 ; x1
Duration: Internal JumperEnable “x10” - giving a 100 msec - 120 sec total range
Repetition (Frequency): Total Range0.01 - 1200 Hz in five overlapping ranges
Repetition (Frequency): ControlSingle turn control marked 1 – 12 Hz with intermediate integer panel marks
Repetition (Frequency): Accuracy±1% at ‘1’ and ‘12’ marks, ±5% at intermediate marks
Repetition (Frequency): Multiplierx0.01 ; x0.1 ; x1 ; x10 ; x100
Delay: Total Range1 - 1200 msec in three overlapping ranges
Delay: ControlSingle turn control marked 1 - 12 msec with intermediate integer panel marks
Delay: Accuracy±1% at ‘1’ and ‘12’ marks, ±5% at intermediate marks
Multiplier: Internal JumperEnable “x10” - giving a 10 msec - 12 s total range
Multiplier: Indicator“TOO LONG” Red LED that flashes if DELAY longer than can be produced for each pulse
Outputs - SYNC: ConnectorBNC socket
Outputs - SYNC: SignalPositive going, 200µs pulse, TTL compatible pulse (5 V amplitude)
Outputs - OUT: ConnectorSelection of only the Delayed pulse (upwards) or both the Sync and Delayed pulses
Outputs - OUT: SignalPositive going, 200µs pulse, TTL compatible pulse (5 V amplitude)
Outputs - OUT: ControlSelection of only the Delayed pulse (upwards) or both the Sync and Delayed pulses
Outputs - OUT: IndicatorAmber LED that flashes for each OUT output pulse
Outputs - OUT: Internal JumperEnable “Active Low” - giving an Output that is Low during its active phase
Power: ControlON/OFF toggle: OFF is down
Power: Consumption< 2 mA
Power: InternalPP3 - (IEC-6LR61) style, alkaline preferred
Power: Battery Life250 Hours with EverReady 6LF22 or Duracell MN1604

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Journal Articles Back to Top

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