Open-Loop Piezo Controllers
Chapter 5: Operation
Page 12
Rev C, July 7, 2015
5. For sinusoidal and ramp signals, calculate the output current and verify
that it will not exceed the maximum current rating of
60 mA
. A piezo
acts like a capacitor; therefore the output current is a function of the
change in voltage divided by the change in time. The MDT693B and
MDT694B both have an output-current-limiting circuit to prevent
damage to the unit, but the output sinusoid will be distorted.
5.8.
Master Scan Control (MDT693B Only)
The Master Scan feature allows all three channels to be controlled by one manual
adjuster or one external control signal. Each channel has an independent gain
adjustment (SCAN TRIM) that allows the user to compensate for differences
between each piezo. The output of each channel is summed with the INT control
knobs to provide a different DC offset for each channel.
The Master Scan mode is especially useful for three-axis mounts such as the
MAX312D. The SCAN TRIM gain controls and the INT knobs allow the user to
precisely tune each output separately, while the MASTER SCAN INT and
MASTER SCAN EXT controls adjust all channels simultaneously.
Enable Button
The
ENABLE
button located on the front panel (see Section 5.1, page 8) is used
to enable and disable Master Scan mode. The EXT in for each channel will be
disabled and replaced by the master scan EXT signal.
Enable LED
The enable LED, located directly above the
ENABLE
button, will light when Master
Scan mode is activated.
Master Scan EXT
An analog voltage between 0 V and 10 V can be applied to this input to control all
three channels over a voltage range of 0 V to 75 V, 0 V to 100 V, or 0 V to 150 V.
This input will be summed with the
MASTER SCAN INT
and the individual
INT
knobs for each channel, up to a maximum control voltage of 10 V. The
MASTER
SCAN EXT
input is only active when Master Scan mode is active (i.e., the enable
LED must be lit). Note that the individual EXT in for each channel is disabled when
Master Scan mode is active.
Master Scan INT
The
MASTER SCAN INT
knob allows adjustment of all three channels over the
full operating range of 0 V to 75 V, 0 V to 100 V, or 0 V to 150 V. This input will be
summed with the
MASTER SCAN EXT
and the individual
INT
knobs for each
channel, up to a maximum control voltage of 10 V. The
MASTER SCAN INT
knob
will only be active when Master Scan mode is active (i.e., the enable LED must be
lit).
Содержание MDT693B
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Страница 30: ...Open Loop Piezo Controllers TTN011225 D02 Rev C July 7 2015 ...
Страница 32: ...www thorlabs com ...
