53A-334 Reed Relay Scanner card
ORDERING INFORMATION
53A-334 – Reed Relay Scanner card
OPT 1V – Add VXIbus Compatibility
53A-720 – Analog cable. or
53A-780 – Hooded Connector
• 32 separately controllable 1-wire channels
• Random channel selection at rates up to 350 channels per second
• Two-digit readback of closed channel
• At least 10^7 operations per channel at rated load of 10 Watts
The 53A-334 Reed Relay Scanner Card provides 32 one-wire channels of analog signal acquisition or distribution at a switching rate of up to 350 channels per second. A channel can be randomly selected (closed) by transmitting ASCII characters from the system controller to the CDSbus chassis.
Up to ten 53A-334 cards can be plugged into one CDSbus™ chassis to scan up to 320 channels. As many as ten card cages can be chained together to provide a system with up to 3,200 one-wire channels.
The Card includes a readback feature that provides a two digit indication for the closed channel. The readback feature uses an additional pole on each relay to insure complete accuracy. In the event of multiple closures an error code is generated.
The output of each Scanner Card is routed to the front edge connector and to the analog backplane of the chassis. The backplane analog bus allows the Scanner Card to route signals to other devices (such as the 53A-522 DMM) without additional external interconnect wiring.
BITE
Fourteen LEDs provide Built-In-Test Equipment (“BITE”) for the Scanner Card. A combination of two lit LEDs indicates that the associated channel is closed.
Specifications
Configuration:
32 one-wire channels with common one-wire output bus.
Relay Manufacturer:
Coto Model. 3400-0092 (or equivalent).
Contacts:
Ten Watts maximum resistive (100V dc or peak ac or 0.5 amps maximum switching).
Max Carry Current, 2.0 amps.
Initial Contact Path Resistance, less than 100 milliohms.
Contact Resistance at End of Reed Life, less than 1 Ohm.
Reed Life:
At least 10^7 operations per channel at rated load of 10 Watts.
Duty:
Continuous.
Scanning Rate:
Random channels selected at up to 350 channels per second.
Signal Path Specifications (including the effects of the card cage back-plane. Valid at the backplane analog bus connector):
Signal-line Thermal Offset, less than 75 microvolts.
Initial Signal Path Resistance, less than 600 mOhms.
Final Signal Path Resistance, less than 1.4 Ohms.
Insulation Resistance, greater than 10 gigohms between all insulated parts.
Programmed By:
ASCII Characters.
Recommended Cables:
53A-720.
53A-780.
Available Option:
OPT 1V, add VXIbus compatibility.