Analog Inputs - ADInstruments PowerLab/4SP Owner's Manual

Table 1–1
Status indicator states (don't
worry too much about these)
Caution
PowerLab inputs and
outputs are not electrically
isolated. Human subjects
must not be connected
directly to the PowerLab.
If such measurements are
to be made, an isolated
front-end must be used,
such as the Bio Amp.
Chapter 1 — Overview
Power and Status Indicators
The Power indicator on the front panel is a green light, which simply
shows that the PowerLab is getting power. The indicator next to it,
the Status indicator, provides a visual indication of what the
PowerLab is doing, and will flash different patterns and colours
depending on the state of the PowerLab.
Status Indicator
Off Idle and not yet initialised by the software.
Yellow flashes When the PowerLab is powered up, the indicator flashes yellow a
number of times equal to the SCSI ID. For example, 4 yellow flashes
would indicate a SCSI ID number of 4.
Green constant Idle, initialised, and waiting for a command from the computer.
Yellow constant Sampling, or communicating with the computer.
Yellow flash then This indicates that the PowerLab has detected an internal fault during
one or more red the power-up test. The number of red flashes after the yellow flash
flashes indicates the type of error that has been detected. This display will
keep repeating until the power to the PowerLab is turned off.

Analog Inputs

The analog inputs used to record external signals can handle signals
from ±10 V down to the microvolt (µV) range without the need for
additional external amplification. Each PowerLab analog input has an
independently programmable gain amplifier with its own filtering,
and AC/DC coupling. You can set up each input independently to
suit your requirements using the software. Note that applying more
than ±15 V to the analog inputs can damage the circuitry.
The PowerLab/4
SP
Input 1 to Input 4), each with alternative connectors. The top BNC
connector can be used for single-ended input, and the 8-pin DIN Pod
connector below can be used for either single-ended or differential
input. Single-ended inputs record the difference between signal and
ground, and differential ones record the difference between positive
and negative input signals. Do not attempt to record from both the
BNC and Pod connectors for an input at the same time, or the signals
will compete.
has four independent analog inputs (marked
Meaning
7