Section 1
TM6564-C-00
26 April, 2011
1-3
1.3.
REAR PANEL CONNECTIONS
SCANNER INPUTS
Low noise High Voltage BNC for voltage source, Low noise Triax for input (low
current return).
OUTPUT LINES
Two low noise N-Type connectors, one each for source and input.
INTERFACE BUS
24 pin IEEE-488 connector, CINCH No. 57-20240
REFERENCE STANDARD PROTECTION
Screw terminals connected to open collector TTL logic circuit. Terminal goes
low (0 volts) when any relay is closed, and goes high (5 volts through 10k ohm)
when all relays are open. This line can be connected in parallel with other
scanners cascaded in a large system to protect standards from being shorted
together.
1.4.
REFERENCE STANDARD PROTECTION SYSTEMS
Three systems are used to help protect standards from being damaged due to scanner
failure or operator error. These systems are described briefly below. See Theory of
Operation Section for complete description.
a.
The relays are driven from a decoder so that only one output circuit can be
activated for any possible input combination.
b.
Contacts on each relay are connected in series so that all input lines must be open
before power is available to close a relay.
c.
Two push-buttons must be depressed at the same time to actuate any relay, which
requires two hands to operate.
