X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
1
1
-
-
8
8
R
R
E
E
V
V
E
E
1-34 SLOW CODE OUTPUT (OPTION)
This output option is connected to a rear panel BNC connector. This output provides one pulse per
minute, primarily for placing timing marks on drum recorders. Each pulse edge is aligned to within a
few nanoseconds of the XL-DC’s 1 PPS output pulse, with the rising edge at the start of the minute.
The as shipped default values are:
Once per minute = 2 seconds
Once per hour = 4 seconds
Once per day
= 6 seconds
Refer to Keypad and Serial Function 17 for detailed information on "SLOW CODE SETUP". The output
is HCTTL levels and will drive up to 100
Ω
or will drive up to 15 LSTTL loads.
Programmable
Pulse Widths:
On the Minute, On the Hour, On the Day (See Function 17)
Drive:
HCMOS
Accuracy:
150 ns to UTC, 100 ns without SA
1-35 PRECISION 60 PPS OUTPUT (OPTION)
This output option is connected to a rear panel BNC connector. It is intended to be a frequency source
for driving a synchronous motor through a power amplifier. This option would allow a drum recorder to
be kept synchronized to the correct time, independent of local power line frequency variations. The
output is a quasi-square wave with an unusual duty cycle. It is 50% over a period of 50 ms, or 3 cycles.
The cycle timings are:
cycle #1 high 9 ms, low 8 ms
cycle #2 high 8 ms, low 9 ms
cycle #3 high 8 ms, low 8 ms
The output is HCTTL levels and will drive up to 100
Ω
or will drive up to 15 LSTTL loads.
Waveform:
50% over 50 ms, or 3 cycles
Amplitude:
TTL Levels
Drive:
HCMOS
1-36 ALARM OUTPUT-OPEN COLLECTOR (OPTION)
The Alarm Output option is connected to a rear panel BNC connector. This output is controlled by
Keypad or Serial Function 73 “REQUEST/SET ALARM STATUS/CONTROL”. The open collector
alarm output has the following states:
Off
(High Z)
Power off
Off
(High Z)
Error, major or minor enabled alarm fault
On
(Low Z)
Normal, no major or minor enabled alarm faults
Содержание 151-600
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