68
Timing, IRIG-B and Pulses
System (GPS). To produce a 1 PPS signal from the Model 1094B, use either Prog. Pulse A or
Prog. Pulse B. See Figure 8.2 for a comparison between unmodulated IRIG-B and 1 PPS.
8.3.5
Programmable Pulse (Prog. Pulse)
The Model 1094B has two independent programmable pulse functions: Programmable Pulse A and
Programmable Pulse B. Programmable Pulse A has a pulse mode that allows various pulse timing
options from pulses each second up to one pulse per year. Programmable Pulse B has the same two
modes as Programmable Pulse A except that it has a Frequency Mode and Auxiliary IRIG Mode.
The Programmable Pulse A and B feature set is shown in Table 8.3 below.
Other possible signals include controlling a 300-Volt FET for high-level signal handling with any of
the available digital signals. The Programmable Pulse feature also has an adjustable pulse width
in 10 millisecond increments from 10 milliseconds to 10 minutes in duration.
Programmable Pulse Function
Prog Pulse A
Prog Pulse B
Pulse Per Second
yes
yes
Pulse Per Minute
yes
yes
Pulse Per Hour
yes
yes
Pulse Per Day
yes
yes
Single Trigger
yes
yes
Slow Code
yes
yes
Frequency Mode
no
yes
Aux IRIG Mode
no
yes
Table 8.3: Programmable Pulse Output Functions
8.3.6
Programmable Pulse with 300-Volt FET, Setup
With this setting you can perform high-level switching at any of the four timing outputs, setting
the 1094B to trigger a pulse at the required time of day or time interval. Connect a voltage of
up to 300 volts and pull down a signal with the Open Drain 300-Volt FET. Remember to connect
the FET with suitable protection against overvoltage transients and over current conditions. To
set timing output jumpers for programmable pulse with 300-Volt FET, see Section 5.2. Next, you
will need to configure the type of programmable pulse through the Setup Menus. See Section 7.9
for more details on setting up the programmable pulse through the Setup Menus. Programmable
Pulse features may also be set up remotely using 1094 Utility through either serial communication
port. For setup using 1094 Utility, see Section 6.6.8 or Section 6.6.9.
8.3.7
300-Volt FET Connection – Setup and Protection
For setup diagrams see Appendix D, External Switching Applications. Open-drain outputs have
internal protection against over-voltage. Maximum peak ratings are 10 A and 400V. External
protections (current-limiting resistors, surge suppression diodes, snubbers, etc.) must be provided
