User's Manual

Theory of Operation
The 4ET is a Physiotel
®
transmitter that will allow measurement of four different
biopotential readings. Included in these measurements but not limited are EOG, EMG,
ECG and EEG. This transmitter also has the capability to monitor from multi-housed
animals. The signal from this transmitter can be manufactured to broadcast over one of
two different frequencies. The new frequencies accommodate more channels and higher
bandwidth. These new features also accommodate more flexibility for study design than
the standard DSI transmitters.
There are two different frequencies that can be used with this transmitter, allowing two
animals to be housed together while simultaneously collecting data from each animal.
The other option would be to house single animals closer together without the worry of
crosstalk.
Use of this transmitter begins with implanting the different components of the
transmitter. Unlike other standard transmitters from DSI the 4ET has two housing units
with an IS-1 connector to make up the entire transmitter. The leads are attached to the
housing unit that is termed as the sensing unit. The battery is housed in the telemetry unit
along with the signal relay components. The transmitter is designed to accommodate the
option of replacing the telemetry unit without removing the sensing unit. Since there are
two different frequencies it will be important to note the frequencies that are implanted in
animals.
The receiver that is compatible with this transmitter is the RPC-2. This receiver has the
ability to collect from two different frequencies simultaneously. There are two carrier
lights, two power lights, two cables and takes up two slots on DQ ART. When pair
housing the animals you will need a spacer in between the receiver and the animal’s cage.
Specifications
Naming Convention
The 4ET model name, for example H4ET-S1, is defined by the following:
The first alpha value is indicating if it is hermetic: H4ET-S1
H = Hermetic
No letter = Non-hermetic
The next alpha-numeric value is indicative of the transmitter type: H4ET-S1
4E = four biopotential channels
T = temperature channel
The last alpha-numeric value represents size and frequency of transmitter: H4ET-S1:
S1 = small animal, frequency 1