53A-333  Reed Relay Scanner card

53A-333 – Reed Relay Scanner card
OPT 1V – Add VXIbus Compatibility
53A-720 – Analog Cable. or
53A-780 – Hooded Connector

• 15 separately controllable 3-wire channels
• Random channel selection at rates of up to 150 channels per second
• Two-digit readback of closed channel
• Error indication in the event of multiple closures
• Very low thermal offset

The 53A-333 Reed Relay Scanner card provides 15 three-wire channels of analog signal acquisition or distribution at a switching rate of up to 150 channels per second. Any single channel may be closed at random by sending ASCII characters from the system controller.

A single CDSbus™ chassis can hold up to ten Cards (up to 150 scan channels), and a complete 53A System can control up to 100 Cards (up to 1,500 Scan channels). Each Reed relay scanner Card may be operated independently or logically connected with any other scanner card in the system.

The Card includes a readback feature using a third relay pole to insure complete accuracy, that provides a two digit indication for the closed channel. In the event of multiple closures an error code is generated.

The output of each Card is routed to the front edge connector and to the analog backplane of the chassis. The internal analog backplane is used to route signals to other CDS instrumentation without the need for external wiring.

Fifteen LEDs provide Built-In-Test Equipment (“BITE”) for the 53A-333 Card. A lit LED indicates that the associated channel is closed. In addition the readback feature can be used to provide diagnostic information to the system controller.

15 each dry reed relays, 4-pole, form A with readback. Common output bus, 3 lines.

Relay Manufacturer:
Coto Model. 7004-5054 (or equivalent).

Ten Watts maximum resistive (200V dc, 130V ac RMS balanced input or 90V ac RMS, single-ended maximum switching voltage).
O.5A maximum switching current.
Initial Contact Resistance, less than 150 milliohm.
Contact Resistance at End of Reed Life, less than 1 Ohm.

Reed Life:
At least 10^10 operations per channel dry-circuit, 10^7 operations per channel -30V dc/30V PTP at 300 mA


Scanning Rate:
Random channel selection at greater than 150 channels per second maximum.

Signal Path (including the effects of the card cage backplane. Valid at the backplane analog bus connector):
Differential Thermal Offset, less than 10 microvolts.
Single-line Thermal Offset, less than 40 microvolts.
Initial Signal Path Resistance, less than 400 milliohms.
Signal Path Resistance at End of Reed Life, less than 1.4 Ohms.
Insulation Resistance, greater than 10 gigohms between all channels.


Programmed By:
ASCII Characters.

Recommended Cables:

Available Option:
OPT 1V, add VXIbus compatibility.