Campbell Scientific AM16/32B Relay Multiplexer - Manual (Page 15)

AM16/32B Relay Multiplexer
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 Campbell
Scientific 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.
0.0
2.0
4.0
6.0
8.0
10.0
12.0
9.
6
10
10.
4
10.
8
11.
2
11.
6
12
12.
4
12.
8
13.
2
13.
6
14
14.
4
14.
8
15.
2
15.
6
16
POWER SUPPLY VOLTAGE
RELAY ACTUATION TIME (ms)
65C 50C 25C -25C
10.
9
11.
3
11.
7
12.
1
12.
5
12.
9
13.
3
13.
7
14.
1
14.
5
14.
9
15.
3
15.
7
16.
1
16.
5
16.
9
17.
3
FIGURE 3-1. AM16/32B relay actuation time vs. temperature and
battery voltage
4. Operation
Section 4.1, The Control Terminals, discusses the terminals that control
operation of the multiplexer. These terminals are located at the left-hand side
of the multiplexer as shown in FIGURE 2-1. Section 4.2, Measurement
Terminals, discusses the use of sensor measurement terminals.
4.1 The Control Terminals
The CABLE4CBL cable is used to connect the control terminals. The
CR5000, CR3000, CR800, CR850, CR1000, CR23X, CR10(X), 21X, and CR7
5