Data Translation DT9828, User Manual

Page: 60 / 116

Chapter 5
60
Table 1 lists the supported measurement range for each thermocouple type.
Refer to page 95 for the thermocouple accuracy of thermocouple channels over the dynamic
range of the instrument.
The DT9828 module can acquire data from a single analog input channel or from a group of
analog input channels. Analog input channels are numbered 0 to 7. The following subsections
describe how to specify the channels.
Specifying a Single Channel
The simplest way to acquire data from a single analog input channel is to specify the channel
for a single-value analog input operation using software; refer to
page 63 for more information
on single-value operations.
You can also specify a single channel using the analog input channel list, described in the next
section.
Specifying One or More Channels
You can read data from one or more analog input channels using an analog input channel list.
You can group the channels in the list sequentially (starting either with 0 or with any other
analog input channel) or randomly. You can also specify a single channel or the same channel
more than once in the list.
Using software, specify the analog input channels in the order you want to sample them. You
can enter up to 1024 entries in the channel list. For the DT9828, channels 0 to 7 correspond to
the analog input channels and channel 8 corresponds to the digital input port.
Reading the digital input port (digital lines 0 to 3) using the analog input channel list is
particularly useful when you want to correlate the timing of analog and digital events.
Table 1: Supported Measurement Range for Each Thermocouple Type
Thermocouple
Type
Supported Measurement Range
Minimum Maximum
J –210
°
C (–346
°
F) 1200
°
C (2192° F)
K –200
°
C (–328
°
F) 1372° C (2502° F)
T –200
°
C (–328
°
F) 400° C (752° F)
B 250
°
C (482
°
F) 1820° C (3308° F)
E –200
°
C (–328
°
F) 1000° C (1832° F)
N –200
°
C (–328
°
F) 1300° C (2372° F)
R –50
°
C (–58
°
F) 1768° C (3214° F)
S –50
°
C (–58
°
F) 1768° C (3214° F)