MOGlabs MWM, Manual, Page: 16 / 96

8
Chapter 2. Standalone operation
2.4.4 Units
The
MWM
measures wavelength in ambient conditions, but uses measured
temperature and pressure to estimate the wavelength in vacuum, in air
at standard temperature and pressure, or as a frequency or wavenumber.
Column
returns the sensor pixel number corresponding to the spectral peak,
for diagnostic purposes.
2.4.5 PID
The
MWM
can output a
PID
control signal on the
SMA
connector for laser
wavelength stabilisation (see 4.3.4). The
PID
menu allows display and
adjustment of the
PID
setpoint, gain coefficients, offset voltage and limits.
These values would normally be entered using
mogwave
or other interface
but it may be useful to display and make small changes on the device.
To alter the static values, select the desired item using the up/down arrow
keys, then press
OK
. The value will be highlighted as inverted text and
can be altered using the up/down arrows. Use the
←
button to move
the cursor to the left. The cursor cannot be moved right; instead, keep
pressing
←
until the cursor wraps around.
Press
OK
when finished editing the value.
To save the new values, move down the menu to
Save to eeprom
and press
OK
.