7
OPTICAL/PIN I/P -
SMB connector
– used to receive a signal from a PIN diode, as
incorporated in external detector heads.
FC/PC connector
– for use with detectors NTA007 and
NTA009. Incorporates an internal detector and accepts a
connectorized fiber.
SIG IN
(BNC connector) – 0 to 10V, 100k
load. Used to receive a signal of optical
power from an external power meter. Can be set to ±1V, ±2V, ±5V or ±10V full scale
in the Settings panel (see Section 3.9.2.).
SIG OUT
(BNC connector) – 0 to 10V, 2mA. Can be connected to an oscilloscope to
monitor the power signal received on the OPTICAL IN connection. Also used in dual
NanoTrak operation (see Section 3.10.3.).
HORIZONTAL Drive Channel
HV OUT
(SMC connector) – 0 to 75V, 0 to 250mA. Provides the drive signal to the
piezo actuator.
EXT IN (+)
and
EXT IN (-)
(BNC connector) – Used to control the position of the piezo
actuator from an external source. 0 to ±10V 100k
load. Polarity is selected in the
Settings panel (see Section 3.9.2.) or in software by calling the appropriate function
(see
Kinesis API helpfile
). The difference between the two signals is amplified
internally before being routed to the HV OUT connector.
PIEZO IN
– receives the signal from the position sensor (strain gauge) of the piezo
actuator to provide the feedback for the control loop - see Section 4.2.6.
VERTICAL Drive Channel
– as Horizontal Drive Channel.
CONTROL I/O
LV CH1/TRIG. OUT and LV CH2/TRIG. IN
(BNC connector)
– 0 to +10V. These
outputs mirror the associated HV OUT, 10V being equivalent to 75V on the HV
outputs, and can be connected to an oscilloscope to enable the drive signal of the
piezo actuator to be monitored.
USER I/O
- For use with digital, programmable I/O and serial ports - see Section 4.2.5.
COMMS
– USB port for system communications.
Bonding point
–
used to electrically bond multiple units to eliminate circulating earth
(ground) currents. Do not connect to the main power supply ground.
3.4 Detector Heads and Cables
The OPTICAL/PIN I/P connector on the rear panel of the NanoTrak controller has
been designed to increase the interchangability of the optical input source. A range of
connectors are available which simply plug into the connector on the rear panel.
The BNT001/IR NanoTrak is supplied with an Infra Red InGaAs photodiode, and a
standard SMB connector for use with external detector heads which incorporate a PIN
(p-type/intrinsic/n-type) diode.
A visible spectrum Si photodiode (NTA009) is available separately.
