WA-1150 and WA-1650 Wavemeter Operating Manual
Appendix D
Rear Panel Controls
EXFO Burleigh Products Group Inc. (09042-M-00 Rev C)
D-5
Table D-2 Signal Monitor Pinout
Pin
Number
Signal Name
Signal
Type
Description
1
INPUT
Analog
Input laser sinusoidal fringe signal.
2
REFERENCE
Analog
Reference laser sinusoidal fringe signal.
3
VREF
TTL
Valid reference laser fringe amplitude.
4
ZOP1 Raw
5
TRIGGER
TTL
Scanning Window Trigger is a digital pulse with a duration that
defines the maximum measurement interval for the interferometer
scan. It goes active (H = active) during the allowed measurement
interval.
6
DGND
-
Digital Ground
7
1 TRIG
8
ZOP
TTL
Zero Optical Path (ZOP) is a digital pulse derived from the
interferometer scanner that produces a low to high transition at the
point in the scan where the difference between the two optical
paths in the interferometer is zero.
9
AGND
-
Analog Ground
10
AGND
-
Analog Ground
11
N/C
12
N/C
13
N/C
14
DGND
-
Digital Ground
15
WINDOW
TTL
Scanning Window digital output is derived from the amplitude of
the input laser fringe signal. When the p-p amplitude of this signal
exceeds 1 volt, within the Trigger interval and before or spanning
the ZOP transition, the Window is active (H = active). Depending
on the character of the input laser fringes, there may be several
Windows during a Trigger, but the first Window period to
terminate after the ZOP transition is the only “Valid Window” used
for the measurement.
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