DLS Reference 100 Instruction Manual download pdf (Page 6)

2 World Precision Instruments

INTRODUCTION

The DLS100 is a biological linear stimulus isolator designed to operate exclusively

with the DS8000 8-Channel Digital Stimulator. In addition to receiving signal

information from the DS8000, the DLS100 is also powered by the DS8000. Up to

eight DLS100 isolators may be connected to a single DS8000.

A high degree of signal precision is maintained by taking the signal information

from the DS8000 in digital form. The digital signal information is converted to

analog by a Digital-to-Analog converter within the DLS100. Isolation is achieved

through the use of optical isolation of the digital control signals and a DC-to-DC

power converter. This power converter, which was developed by WPI speciﬁcally for

the DLS100, eliminates the batteries usually employed in other stimulus isolators.

The elimination of batteries allows the isolator to run indeﬁnitely as long as it is

connected with the DS8000.

Notes and Warnings

WARNING! ELECTRIC SHOCK HAZARD! THE DLS100 IS CAPABLE OF

PRODUCING HAZARDOUS VOLTAGES IN EXCESS OF 100 VOLTS. USE

CARE NOT TO CREATE ELECTRICALLY EXPOSED OPEN CONNECTIONS TO

THE DLS100 SO THAT YOU DON’T COME INTO CONTACT WITH THE

OUTPUT VOLTAGE. IT IS UP TO THE USER TO ENSURE SAFE CONNECTIONS.

CAUTION: DS8000 MUST be powered off before attaching the DLS100.

General Notes

• If a monitoring device is connected to the DLS100, the “–” output of the DLS100

must always be connected to the ground input of the monitoring device.

• In applications where a bio-ampliﬁer and electrodes are used to monitor a

stimulus response, a connection from the DLS100 “–” output to the ground input

of the bio-ampliﬁer must be made.

• To obtain negative polarity outputs, do not exchange the DLS100 output

connections. Set the DS8000 output for negative polarity. Always observe the

grounding conditions speciﬁed above.

• For lowest noise and offset current, select the range that delivers the desired

current with the amplitude from the DS8000 set between 1–10V. Also, choose

stimulation and reference electrodes with the lowest practical impedance.

• The DLS100 should be located as close as practical to the experiment (the load).

Shorter connecting wires ensures the highest possible frequency response.

• As a precaution, the DLS100 is designed so that the lowest current range is

automatically selected and the output switch is off during initial power up.

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DLS Reference 100 Instruction Manual Page 6