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3.9 Chart Recording
The instrument provides an analog voltage output via a
2.5mm pin jack labeled "AN OUT" on the rear panel
(See figure 3).
This is useful for driving chart recorders and other
analog devices.
The voltage is proportional to the reading on the
display and scaled such that full scale equals 1.00
volts.
The output can drive up to 2mA into an external
device.
3.10 Beam Splitter Function
If you have a measurement setup with a beam splitter
or attenuator and wish to display the laser power or
energy before the splitter or attenuator and not the
actual value impinging on the measurement head the
beam splitter function allows you to do this. For
example, if you are splitting off 4.5% of a laser beam
into the meter and you wish to display the full beam,
do as follows:
1. Press the menu button twice and press “more”
then select “atten”. Press “go”.
2. Press “select” so the screen says “attenuation
screen – on”. Press “exit”.
3. Press “set %”. Now alternately press “select”
and “change” to set the value of the percent split
off to 4.5%. Press “exit” and the value will be
saved.
4. When you turn on the Nova now with a
measuring head, the display will come up in the
attenuation screen and the value displayed will
be 1/(attenuation fraction) instead of the power or
energy actually on the screen. For instance in the
present example, if the laser power on the head
is 5.5 Watts, 5.5/0.045 = 122.22 Watts will be
displayed. If the menu button is pressed again,
you will be in the normal measurement screen
where the actual value measured is displayed.
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