C.15 Option 27: 8-Channel High Drive 151
C.15 Option 27: 8-Channel High Drive
C.15.1 General Description
Option 27 provides eight independent, IRIG-B buffered outputs, each capable of driving multiple
loads. Outputs are short circuit and surge protected. Each output is individually configurable for
either modulated or unmodulated IRIG-B signals via jumper settings as illustrated in Figure C.17.
C.15.2 Specifications
Output Selection Each output is jumper selectable for either a Modulated or Unmodulated signal.
See Figure C.17 for jumper locations and configuration settings.
Number of Channels: Eight (8).
Signal Levels:
Modulated: 4.5 Vpp with 20-Ohm source impedance; each channel
will drive a 50-Ohm load to 3 Vpp minimum; requires
Option 92 in Model 1093A/B/C.
Unmodulated: +5-V open-circuit; +4 V minimum at 250-mA load
load current each channel will drive 25 Schweitzer
SEL-3xx (in parallel) or 50 SEL-2xx (in series/parallel)
relays at 10 mA per relay.
Maximum Load (per driver):
Modulated: No Limit: will drive a short circuit.
Unmodulated: 250-mA peak current; pulse-by-pulse shutdown if load
current exceeds internal limit (self-resetting).
Output Connector
16-position pluggable 5-mm (Phoenix-type) terminal strip with eight 2-position mating connectors.
C.15.3 Option Setup
Using Front Panel Keys
To set up Option 27 from the front-panel keys, please follow the guidelines in Section 6.12.
Using RS-232C Port
To set up Option 27 using the RS-232C port, please follow the guidelines in Section 9.2.13.
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