TDT RZ2 Manual page 451

System 3
Jumper Configuration
The following table describes the jumper configurations and associated requirements.
Jumper
Connections
G
R
Ref
G
R
Ref
G
R
Ref
RA16AC ‐ 16 Channel Acute Headstage
The 16 Channel acute headstages is recommended for extracellular neurophysiology
using silicon electrodes, metal microelectrodes or microwire arrays with recommended
input impedance from 20 kOhm to 5 Mohm unless otherwise noted.
The 16 channel acute headstage has an 18-pin DIP connector that can be used with
standard high impedance metal electrodes. The pinout of the RA16AC matches the
wiring of NeuroNexus electrodes to allow for direct connection to the headstage. TDT
recommends connecting electrodes to an 18-pin socket and then connecting the
socket to the headstage to protect the headstage from unnecessary wear and tear.
The RA16AC4 provides 4x gain and is used with electrodes with a recommended
impedance range of 20 kOhm to 300 kOhm.
The headstage connects to a System 3 Medusa preamplifier (such as the RA16PA)
via a DB25 connector or to a PZ series preamplifier via a mini 26-pin connector.
Part Numbers:
RA16AC—16 Channel Acute Headstage for Medusa PreAmps, with unity (1x) gain
RA16AC4—16 Channel Acute Headstage for Medusa PreAmps, with 4x gain
RA16AC-Z—16 Channel Acute Headstage for Z-Series (PZ) PreAmps, with unity
(1x) gain
handling.
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
Shorts headstage Ground and Reference
inputs together, yielding single-ended
amplification of signals relative to ground.
Shorts headstage Reference input to the
pin labeled Ref (a low impedance site on
the probe) yielding differential amplification
of signals relative to the voltage of the
Ref site.
Headstage Ground and Reference
separated and Ref pin is not used,
yielding differential amplification of signals
relative to the voltage of the Reference.
The headstage has sensitive electronics. Always ground yourself before
Operation
10-37
Requirements
Connect common
Ground/Reference wire
to the headstage or
electrode.
Connect Ground wire
to the headstage or
electrode.
Connect both a Ground
wire and a Reference
wire to the headstage
or electrode.
Acute (Non-ZIF) Headstages