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8.3 Output Signal Description 53

the rising edge when compared with the signal from the Global Positioning System (GPS). When

conﬁgured from any of the TTL/CMOS (5-volt) drivers, it has the same drive power as the IRIG-B

and the programmable pulse. See Figure 8.2 for a comparison between unmodulated IRIG-B and

1 PPS.

8.3.5 Programmable Pulse (PROG PULSE)

Models 1092A/B/C and 1093A/B/C have an programmable pulse feature that may require some

jumper and ﬁrmware conﬁguration. Models 1093B/C and 1092B may be conﬁgured from the front

panel and 1092A/C and 1093A must be conﬁgured through the RS-232 port. There are many

available programmable pulse modes from which to choose that include setting the pulse width and

time zone. For jumper conﬁguration, please see Section 5.3.1, and for available modes and ﬁrmware

conﬁguration, please see Section 7.8.

Programmable Pulse

Mode

Conﬁgured Feature

Seconds per pulse X number of seconds between pulses, 0 – 60,000

Pulse per hour Number of seconds after each hour, 0 – 3599

Pulse per day Hour, minute, second, fractional seconds

Single trigger Day, hour, minute, second, fractional seconds

Slow code 2 seconds on the minute, 4 seconds on the hour, 6 sec-

onds on the day

Pulse polarity Positive or negative–going pulse

Table 8.3: Programmable Pulse Modes and Features

8.3.6 Programmable Pulse with 200-Volt FET, Setup

For high-level switching on the main board, choose option 1093optS001 or 1092optS001. Clocks can

provide high-level switching at either of the two digital outputs (Port 1 or 3). Connect a voltage

of up to 200 volts and pull down a signal with the open drain 200-Volt FET. Make sure to connect

the FET with suitable protection against overvoltage transients and over current conditions. To

set timing output jumpers for programmable pulse with 200-Volt FET, see Section 5.3.5. Next,

you will need to conﬁgure the type of programmable pulse through the setup menus or serial port.

See Sections 7.8 or 10.2.12.

8.3.7 Protecting the 200-Volt FET Connection

Open-drain outputs are not internally protected against overcurrent or overvoltage. Maximum peak

ratings are 100 mA and 200 V. External protections (current-limiting resistors, surge suppression

diodes, snubbers, etc.) must be provided by the user, if required, to ensure that maximum ratings

are not exceeded even momentarily. Also, consult the data sheet of the VN0120N3 FET used in

these models.

Arbiter Systems 1093B User Manual

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