18
Chapter 4. Operation
0.1
1
10
All
an
de
vi
a�
on,
MHz
Averaging
�
me, s
10
–2
10
–1
10
1
10
2
10
3
10
0
Figure 4.5:
Measurement of the modified Allan deviation of the
FZW
mea-
suring a locked laser, demonstrating that substantially improved precision
can be achieved with averaging.
For increasing time (Figure 4.6) the uncertainty grows, depending
on environmental changes in temperature and pressuer.
Averaging can be enabled through the on-device menu system, or
using the
MEAS,AVERAGE
command. Setting the value to zero disables
the internal averaging.
Averaging can also be enabled in the time-
series window of
mogfzw
, over the inspecified interval.
Operation of the
FZW
in environments with poor ambient temperature
control
can
cause
much
more
rapid
drift,
and
the
benefit
of
data
averaging will be reduced.
4.7
Calibration adjustment
The
FZW
operates
over
a
very
wide
range
of
wavelengths
(400–
1100 nm) and its absolute accuracy over this range is limited by a
Содержание FSW4
Страница 1: ...Fizeau Wavemeter and Fibre Switcher FZW600 FSM2 FSW4 FSW8 Firmware v0 9 5 mogfzw v1 4 5 ...
Страница 36: ...30 Chapter 5 PID locking ...
Страница 50: ...44 Appendix A Specifications ...
Страница 60: ...54 Appendix C Command language ...
Страница 62: ...56 Appendix D Errors and troubleshooting ...
Страница 67: ...F Dimensions and PCB 83 120 146 32 9 30V PID TRIG FSW Figure F 1 FZW chassis dimensions 61 ...
Страница 68: ...62 Appendix F Dimensions and PCB 146 33 37 120 18 Figure F 2 FSW fibre switch dimensions ...
Страница 71: ......