AM32 MULTIPLEXER
5
TABLE 3-1. CR10(X)/AM32 average current drain making differential measurements on 32
thermocouples.
integration time
SCAN RATE
SLOW
60 Hz REJECTION
FAST
2 MIN =>
0.9mA
1.1mA
0.8mA
2 SEC =>
22mA
39mA
17mA
3.2 THE MEASUREMENT TERMINALS
The COM terminals are where the datalogger
connects to the multiplexer for signal transfer.
The terminals labeled 1H, 1L...32H, 32L are for
connecting sensors to the multiplexer (Figure 1-
1). The sensor terminals are connected to the
COM terminals on every clock pulse (clocking is
explained in Section 4).
The 32 sensor terminals run the length of the
multiplexer in two parallel groups. Each
channel has two terminals labeled H and L,
standing for High and Low. As the AM32
receives clock pulses from the datalogger, each
channel is connected sequentially with COM
terminals. For example, when the first clock
pulse is received from the datalogger 1H is
connected with COM HI and 1L with COM LO.
When the second clock pulse is received the
first channel is disconnected and the second
channel is connected to the COM terminals.
4.0 DATALOGGER PROGRAMMING
When a number of similar sensors are being
multiplexed, the Instructions to clock the AM32
and to measure the sensors are entered within
a program loop. The generalized structure of a
program loop is outlined below.
FIGURE 4-1. Single loop instruction sequence
Clock AM32/Delay
Summary of Contents for AM32
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