TDT RZ2 Manual page 479

System 3
Impedance Checking with the Low‐Impedance Headstage
The Impedance checker on the RA16LI provides a simple check of the channel
impedance relative to ground. To check the impedance level, press the button next
to the channel indicator. The highest-level light indicates the maximum impedance
between the channel and the ground. If all impedance lights are illuminated it is
likely that one of the channels is not properly connected. The (-) impedance button
checks the impedance between the reference and the ground.
Headstage Voltage Range
When using a TDT preamplifier the voltage input range of the preamplifier is
typically lower than the headstage and must be considered the effective range
of the system. Check the specifications of your amplifier for voltage range.
Also keep in mind that the range of the headstage varies depending on the power
supply provided by the preamplifier. TDT preamplifiers supply +/- 1.5 V, but third
party preamplifiers may vary. TDT recommends using preamplifiers which deliver +/-
2.5 V or less. Check the preamplifier voltage input and power supply specifications
and headstage gain to determine the voltage range of the system.
The table below lists the input voltage ranges for the RA16LI headstage for either a
+/- 1.5 V or +/- 2.5 V power source.
Headstage input range when using +/-
1.5 V power source
+/- 33 mV
Headstage Technical Specifications
connected to a single common node. See "Headstage Connection Guide" on
page 6-93, for more information.
Input Referred
Noise
Headstage Gain
Highpass Filter
Lowpass Filter
Input Impedance
Electrode Connector Pinout
The electrode connector is a 25-pin connector. Information on the pin inputs is
provided below.
WARNING! When using multiple headstages ensure that all ground pins are
rms 0.1 μV bandwidth 300-3000 Hz
0.3 μV bandwidth 2-8000 Hz
20x
2.2 Hz
7.5 kHz
10 Ohm
6
Headstage input range when using +/
- 2.5 V power source
+/- 80 mV
Low Impedance Headstages
11-5