Campbell AVW1 Specifikace stáhnout pdf (Strana 10)

AM16/32B Relay Analog Multiplexer

Weight:

1.5 lbs. (approx.), 693 g.

Mounting Tab

Hole Spacing:

1 inch x 3 inches x 9 inches. Up to 1/8 inch or 3

mm diameter screws (see Figure 22).

Expandability

(nominal):

2 AM16/32Bs per CR800/CR850

4 AM16/32Bs per CR3000

4 AM16/32Bs per CR5000

4 AM16/32Bs per CR1000

4 AM16/32Bs per CR23X

4 AM16/32Bs per CR10(X)

4 AM16/32Bs per 21X

8 AM16/32Bs per CR7 725 Card

Maximum Cable

Length:

Depends on sensor and scan rate. In general, longer

lead lengths necessitate longer measurement delays.

Refer to datalogger manual for details.

Maximum Switching

Current

***

500 mA

Contact

Specifications:

Initial contact resistance: <0.1 ohm max.

Initial contact bounce: <1 ms

Contact material: Gold clad silver alloy

Wiper to N.O. contact capacitance: 0.5 pF

Typical low-current (<30 mA) life: 5 x 10

operations

Relay Switching

Thermal emf: 0.3 µV typical; 0.5 µV maximum

Characteristics

(applying 11.3 – 14

VDC):

Operate time: <10 ms over temperature and supply

ranges

Break-before-make guaranteed by design.

Relays disengage from previous selected channel

before engaging next channel.

ESD:

Air Discharge: complies with IEC61000-4-2, test

level 4 (±15 kV)

Contact Discharge: complies with IEC61000-4-2,

test level 4 (±8 kV)

Surge:

Complies with IEC61000-4-5, test level 3 (±2 kV,

2 ohms coupling impedance)

Reset and clock protected by 8V varistors; +12V input is protected by +16V transzorb.

Assumes sequential activation of multiplexers and that each datalogger channel is uniquely

dedicated. If your application requires additional multiplexing capability, please consult CSI for

application assistance.

***

Switching currents greater than 30 mA (occasional 50 mA current is acceptable) will degrade

the contact surfaces of the mechanical relays (increase their resistance). This will adversely affect

the suitability of these relays to multiplex low voltage signals. Although a relay used in this

manner no longer qualifies for low voltage measurement, it continues to be useful for switching

currents in excess of 30 mA.

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