Campbell Scientific AM16/32A Multiplexer User Manual
Page 10
AM16/32A Relay Analog Multiplexer
Dimensions:
Length – 23.9 cm (9.4")
Width - 10.2 cm (4.0")
Depth - 4.6 cm (1.8")
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 21).
Expandability**
(nominal):
2 AM16/32As per CR800/CR850
4 AM16/32As per CR3000
4 AM16/32As per CR5000
4 AM16/32As per CR1000
4 AM16/32As per CR23X
4 AM16/32As per CR10(X)
4 AM16/32As per 21X
8 AM16/32As 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
7
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
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, Clock, and +12V inputs are protected by +16V transzorbs.
** 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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