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HA0165T Rev 4K Sept 2017
Chapter 6
On some older piezo drivers, th e external SMA in put always provides a x15
amplification to the high voltage (HV) output, so a full 10V output voltage results
in 150V HV output. For piezo actuators with a 75V maximum voltage range, this
would result in the actuator being overdriven. In this case the 5V range must be
used.
Signal Routing
- the NanoTrak control signals (sine and cosine) are always output on
the external SMA connectors (LV OUT CH1 and LV OUT CH2). In addition, they can
also be routed to the KCH, which eliminates the need for external SMA to SMA cables
when the NanoTrak is used with 2 piezo cubes - see Section 5.3.3.
Select ‘
SMA Only
’; or ‘
SMA or Hub
’ as required by your application.
Persist Settings to Hardware -
Many of the parameters that ca n be set for the
NanoTrak T-Cube can be stored (persisted) within the unit itself, such that when the
unit is next powered up these settings are applied automatically. This is particularly
important when the driver is being used manually in the absence of a PC and USB
link. The
Input Signal Source
parameter described previously is a good example of a
setting that can be altered and then persisted in the driver for use in absence of a PC.
To save the settings to hardware, check the ‘Persist Settings to Hardware’ checkbox
before clicking the ‘OK button.
Input Signal Amplifier (TIA) Autoranging Settings
These settings are used to modify the autoranging and output characteristics of the
NanoTrak input amplifier circuit (Trans-impedance amplifier (TIA) circuit).
Auto-ranging Mode
- when auto-ranging mode is selected o n the GUI panel, range
changes occur whe never the i nput signal reaches the u pper or lower end of the
currently set range.
This parameter specifies how these range changes are implemented by the system.
If
Odd and Even
is selected, the unit visits all ranges when ranging between two
input signal levels.
If
Odd Ranges
(or
Even Ranges
) is selected, only those odd (or even) numbered
ranges between the two input signals levels will be visited. These latter two modes
are useful when large rapid input signal fluctuations are anticipated. This is
because the number of ranges visited is halved to give a more rapid response.
Range Change Limits
- When autoranging, the NanoTrak unit adjusts continually the
TIA range as a ppropriate for the input signal level. When the relative signal on a
particular range drifts below the limit set in the ‘Lower’ parameter, the NanoTrak unit
decrements the range to the next lower setting. Similarly, when the relative signal
rises above the limit specified in the ‘Upper’ parameter, the unit increments the range
to the next higher setting.
