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For comprehensive details, visit: 

www.campbellsci.com/am16-32b

 

© 2020 Campbell Scientific, Inc. | 10/16/2020

Electrical Surge Protection

The equipment is protected from electrical surges using gas 
tubes on all inputs. A 35 V varistor is connected between the 

shield ground and ground lug to provide surge protection. The 
Reset, Clock, and +12 V terminals are protected by 18 V TVS 
diodes. 

Specifications

-NOTE-

The protection on the reset, clock, 
and +12 V inputs are provided by 
18 V TVS diodes.

Power

Unregulated 9.6 to 16 Vdc

Scan Advance

Occurs on the leading edge of the 
clock pulse transition (from below 
1.5 V to above 3.3 V)

Minimum Clock Pulse 
Width

1 ms

Maximum Actuation Time 
for Relay

20 ms

Relay Operation

Break before make

Initial Relay Resistance, 
Closed

0.1 ohm

Maximum Switching 
Current

500 mA 
(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.)

Maximum Switching 
Voltage

50 Vdc 
A voltage divider such as the 
VDIV10:1 may be needed between 
the AM16/32B and the data logger 

to stay within the input limits of 
the data logger channel.

Minimum Contact Life

5 x 10

7

 operations

Maximum Contact Voltage 
Rating

70 V

Maximum Voltage

8 Vdc (clock level)

CE Compliance

EN 55022:1998 Class B
EN 61326:1998

Surge

Complies with IEC61000-4-5, test 
level 3 (±2 kV, 2 ohm coupling 
impedance)

Operating Temperature 
Range

-55° to +85°C (extended)
-25° to +50°C (standard)

Dimensions

23.9 x 10.2 x 4.6 cm (9.4 x 4.0 x 1.8 
in.)

Weight

~680 g (~1.5 lb)

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).

Typical Current Drain

Quiescent

< 210 µA

Active

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

Reset Levels

Inactive

< 0.9 V

Active

3.3 to 8 V

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