Digitimer Ltd - DS8R Operator’s Manual
Version 2.0
6
Digitimer Ltd.
Copyright ©2019
Section 1 - General
Information
DS8R Intended Usage & Description
The DS8R is an isolated, constant current, multi-mode, discrete pulse stimulator for use on human
subjects in a research environment. The stimulator safely delivers brief duration (50-2000µs)
current pulses for transcutaneous electrical stimulation and activation of nerves and muscles via
surface electrodes. The current output of the DS8R is adjustable over the range 0mA to 1000mA,
with a compliance voltage of up to 400V and an energy limit of 300mJ, making it suitable for
demanding stimulation applications including studies of nociception (pain), behavioural psychology,
sports medicine or rehabilitation research. The DS8R is for use by personnel competent to apply
appropriate transcutaneous electrical stimuli or under the supervision and instruction of someone
who is.
The DS8R is fully capable as a standalone stimulator, but control is also possible using the supplied
Windows PC control software via a USB interface. The PC software provides the operator with the
ability to trigger the stimulator and change stimulation parameters and other settings. The DS8R can
also be triggered by (i) supplying a TTL-high voltage on the trigger input socket on the rear panel, (ii)
pressing the manual trigger button on the front panel, (iii) activating a hand/footswitch connected to
the rear panel 3.5mm jack socket, (iv) software commands accessing the DS8R application
programming interface (API).
Control of pulse amplitude is also possible through an analogue voltage input at the rear of the
stimulator. In this mode, the analogue voltage presented at this input will be proportional to the
amplitude of the stimulus current delivered when the unit is triggered. The control voltage has no
influence over the shape of the output pulse and merely determines the amplitude of the
rectangular output stimulus pulse when a stimulus is delivered.
