AM16/32B specifications

Power1, 2:

Unregulated 9.6 to 16 VDC

Current drain

 

Quiescent:

< 210 µA

Active:

6 mA typical in 2x32 mode
11 mA typical in 4x16 mode

Reset (RES)1:

A continuous signal between 3.3 VDC and 8 VDC holds the AM16/32B in an active state (where a clock pulse can trigger a channel advance). A signal voltage < 0.9 VDC deactivates the AM16/32B (clock pulse will not trigger a channel advance; AM16/32B is also reset).

Clock (CLK)1:

On the transition from <1.5 V to >3.3 V, a channel advance is actuated on the leading edge of the clock signal; clock pulse should be a minimum of 1 ms wide; maximum voltage is 8 VDC.

Operational temperature

 

Standard:

–25 to 50 °C

Extended:

–55 to 85 °C

Operational humidity:

0 to 95%, non-condensing

Dimensions

 

Length:

23.9 cm (9.4 in)

Width:

10.2 cm (4.0 in)

Depth:

4.6 cm (1.8 in)

Weight:

680 g (1.5 lb) (approx.)

Mounting tab hole spacing:

1 x 3 x 9 in. Up to 1/8 in or 3 mm diameter screws

Expandability3 (nominal):

4 AM16/32Bs per CR6
4 AM16/32Bs per CR3000
4 AM16/32Bs per CR1000X
2 AM16/32Bs per CR800/CR850
1 AM16/32B per CR300
4 AM16/32Bs per CR1000

Maximum cable length:

Depends on sensor and scan rate. In general, longer cable lengths necessitate longer measurement delays. Refer to data logger and sensor manuals for details.

Maximum switching current4:

500 mA

Contact specifications

 

Initial contact resistance:

<0.1 Ω max.

Initial contact bounce:

<1 ms

Contact material:

Silver Palladium

Wiper to N.O. contact capacitance:

0.5 pF

Typical low-current (<30 mA) life:

5 x 107 operations

Maximum contact voltage rating:

70 V

Relay Switching

 

Thermal emf:

0.3 µV typical; 0.5 µV maximum

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)

Compliance:

View EU Declaration of Conformity at
www.campbellsci.com/am16-32b

1 The Reset, Clock, and +12V terminals are protected by 18-volt TVS diodes.

2 For power specifications on serial numbers less than 5056, refer to an older version of this manual at www.campbellsci.com/old-manuals .

3 Assumes sequential activation of multiplexers and that each data logger channel is uniquely dedicated. If the application requires additional multiplexing capability, please consult Campbell Scientific for application assistance.

4 Switching currents greater than 30 mA (occasional 50 mA current is acceptable) will degrade the contact surfaces of the mechanical relays and 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.