Campbell AM16/32B Manuel du propriétaire

PRODUCT

For comprehensive details, visit: www.campbellsci.com/am16-32b

Overview

The AM16/32B multiplexer significantly increases the number

of sensors thatyou can measure with a Campbell Scientific

data logger. It interfaces with the data logger and adds

terminals so that you can wire additional sensors of almost any

type.

Benefits and Features

Significantly increases the number of sensors the data logger

can measure

Can multiplex 16, 32, or 48 sensors

Supports many types of sensors including thermistors,

potentiometers, strain gages, vibrating wires, reflectometers,

and soil moisture blocks

Decreases the cost of cabling individual sensors on long wire

runs

Allows a relay address to be used to go directly to a specific

channel—reducing power consumption and wear on the

relay switches

Electrical surge protection via gas tubes on all analog I/O,

and varistors or TVS diodes on all other connections

Prevents sensor-cable damage by providing strain relief for

sensor leads and independent routing for sensor shield lines

Eliminates the requirement for dc blocking capacitors for

gypsum soil moisture blocks, significantly reducing sensor

cost

Detailed Description

Depending on sensor type, the AM16/32B can multiplex 16, 32,

or 48 sensors. Up to six AM16/32Bs may be connected to the

same data logger, depending on the number of control ports

and analog inputs available.

The AM16/32B either multiplexes 16 groups of four lines (a

total of 64 lines) through four common (COM) terminals.

Alternatively, a manual switch setting allows the AM16/32B to

multiplex 32 groups of two lines (also a total of 64 lines)

through two COM terminals. A cable connects the common

terminals to data logger analog inputs, excitation channels, or

ground as required by the sensor. The data logger controls the

multiplexer using two control ports, or one control port and

one excitation channel.

Greatly

Increases

Sensor

Capacity

Connects many sensors to single

data logger

16- or 32-Channel Relay Multiplexer

AM16/32B

For comprehensive details, visit: www.campbellsci.com/am16-32b

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 107 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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