TDT RZ2 Manual page 293

System 3
Power
A switch on the back powers up the amplifier. The fiber connector at the right will
be illuminated when the amplifier is on.
LEDs
This switch turns the clip warning lights on top of the amplifier on or off.
Power Requirements
The Lithium-ion batteries charge in four hours. Keeping the battery charger connected
to the amplifier does not affect the battery life. However, the charger will significantly
increase the noise of the system if it is plugged in while an experiment is running.
A 6 volt battery charger is included with the amplifier. The charger tip is center
negative. If it is necessary to replace the charger make sure that the power supply
has the correct polarity.
The Li-ion battery supplied with the system cannot be removed. If battery life longer
than 30 hours is required, an external battery pack can be connected to the voltage
inputs of the charger. TDT recommends a 6 (minimum) to 9 Volt (maximum)
battery, such as lead acid batteries used for motorized wheel chairs. Contact TDT for
more information.
RA16PA Medusa PreAmp Technical Specifications
Includes specifications for the RA4PA, RA16PA, and RA16SD Medusa Preamplifiers.
A/D
Input Impedance
RA4PA: 4-channels 16-bit PCM
RA16PA: 16-channels 16-bit PCM
RA16SD: 16-channels 16-bit sigma-delta
6, 12, or 25 kHz
Sample Rate
RA4PA and RA16PA: +/- 4 millivolts
Maximum Voltage In
RA16SD: +/- 5 millivolts
3 dB 2.2 Hz - 7.5 kHz
Frequency Response
2.2 Hz
Highpass Filter
RA4PA and RA16PA: 7.5 kHz (3 dB corner, 1st order, 6
dB per octave)
Anti-Aliasing Filtering
RA16SD: 7.5 kHz (3 dB corner, 2nd order, 12 dB per
octave)
RA4PA and RA16PA: 60dB
S/N (typical)
rms 3 microvolts bandwidth 300 - 3000 Hz
Input Referred Noise
6 microvolts bandwidth 30 - 5000 Hz
RA4PA and RA16PA: NA
Group Sample Delay
RA16SD: 20 Samples
10
5
Ohms
RA16PA/RA4PA Medusa PreAmps
6-85