Daytronic AA14-4F010 Bedienungsanleitung
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AA14-4F010
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The AA14-4F010 is a high-isolation, four-channel conditioner, accepting real-world
temperature signals from
Types E, J, K, N, R, S, and T Thermocouples. Based on
NIST polynomials, linear output is produced over each thermocouple’s stated operat-
ing range, and within the rated accuracy limits—
without the need for additional output
processing.
See Table 1 for the “mV/degree” linear output produced by the AA14-
4F010 for different TC types and ranges (°C or °F).
PLEASE NOTE: WHILE ALL FOUR CHANNELS OF A GIVEN AA14-4F010 CARD MUST
BE DEDICATED TO THE SAME TC TYPE
, INDIVIDUAL CARDS DEDICATED TO DIFFER-
ENT TC TYPES MAY BE MIXED AS DESIRED WITHIN THE TOTAL DATA ACQUISITION
SYSTEM. IT IS ALSO REQUIRED THAT THE AA14-4F010’S
CHANNEL NO. 1 BE USED.
This conditioner features
true galvanic isolation with pulse-width modulation,
allowing sensor-to-chassis or sensor-to-sensor common-mode voltages as high as
1500 V (rms) to be accommodated. Internal reference-junction compensation is auto-
matically selected by thermocouple choice. No external cold junction is required
(although the user may supply his own Controlled Ambient Temperature Zone for ref-
erence-junction purposes, if desired). A conventional Daytronic four-channel isother-
mal connector assembly (No. 60323, shown in Figs. 2 and 3) is supplied with each
Model AA14-4F010, with screw terminals for direct connection of TC leads (which can-
not be soldered), and with a
precision thermistor for measurement of the reference-
junction temperature. The same connector may be used with any TC type.
In the event of a broken thermocouple wire or other “open TC” condition, the AA14-
4F010 will automatically report an indeterminate off-scale reading for the TC channel
in question, with positive or negative polarity selectable on a per-channel basis (as
explained in Section 3.a).
Each AA14-4F010 input channel employs an active low-pass filter with a fixed cutoff
frequency of 10 Hz. A nominal ±5-V ANALOG OUTPUT is produced by each active
AA14-4F010 input channel, for purposes of real-time signal monitoring. Each of these
“Auxiliary Outputs” is available on a corresponding mainframe wire-wrap pin. Each
output may be individually set, if desired, to represent the
prefiltered value of the cor-
responding input (see Section 3.b).
“Absolute” calibration lets you quickly set up each TC-based data channel simply by
entering appropriate “type” and “range” information. During operation, appropriate
reference-junction compensation, real-time digital linearization, and engineering-unit
scaling are automatically applied for each type of thermocouple used. A second, two-
point “zero and span” calibration technique is provided, however, for applications
where it is desirable to force multiple TC readings to the same exactly known temper-
ature.*
MODEL AA14-4F010
THERMOCOUPLE
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS AA14-4F010.1
SYSTEM 10
ANALOG INPUT CARDS
* In heat balance applications, for example, it is useful to be able to zero all readings simultane-
ously.
1.E.2.AA14-4F010
NOTE: Fig. 1 shows the stand-off circuit boards (or “tiles”) that provide the analog fil-
tering and galvanic isolation for an AA14-4F010 card’s data channels.
FILTER TILES
(ONLY) MAY BE INSTALLED OR REMOVED BY THE USER, IN THE FIELD. CONTACT
THE DAYTRONIC SERVICE DEPARTMENT FOR COMPLETE INSTRUCTIONS.
ADDITIONAL AA14-4F010 SPECIFICATIONS
Number of Input Channels:
Four
Thermocouple Types and Ranges: See Table 1; automatically selected—on an indi-
vidual channel basis—when the channel is configured; for System 10 channel “type”
codes assigned to AA14-4F010 data channels, see Table 3 (Section 3.c)
Amplifier (per channel):
Normal-Mode Range: ±80 mV operating; ±240 V without instrument damage
Common-Mode Range: 1200 V (rms) operating and without instrument damage
Common-Mode Rejection Ratio: DC and at 60 Hz: -130 dB
Input Impedance: Differential: 10 MΩ; Common-Mode: 470 pF to earth
Offset: Initial: ±10 µV; vs. temperature: ±0.2 µV/°C; vs. time: ±0.5 µV/month
Gain Accuracy: ±0.05% of full scale
Gain Stability: vs. temperature: ±25 ppm/°C; vs. time: ±20 ppm/month
Filter (per channel): 3-pole modified Butterworth, 3 dB down at 10 Hz; 60 dB down at
195 Hz
Step-Response Settling Time (Full-Scale Output):
To 1% of final value: 70 msec
To 0.1% of final value: 85 msec
To 0.02% of final value: 95 msec
Auxiliary Outputs: Nominal ±5 V-DC signals available on mainframe wire-wrap pins*;
individually jumper-selectable to represent either the
filtered or prefiltered value of
the channel (see Section 3.b)
Power-Supply Slot Allotment: Maximum consumption of supply current from the
Conditioner Card Slot is 95 mA
AA14-4F010.2 GENERAL DESCRIPTION AND SPECIFICATIONS
AA14-4F010 THERMOCOUPLE CARD
Four-Channel
Isolator Tile
Fixed
10-Hz
Filter
(Chans.
1 & 2)
I/O Connector
Fixed
10-Hz
Filter
(Chans.
3 & 4)
Fig. 1 Model AA14-4F010 Modular Card Components
* The wire-wrap pins to which the AA14-4F010’s “Auxiliary Outputs” are brought are located on
the respective analog motherboard within the system mainframe, and should not be confused
with the DIAGNOSTIC WIRE-WRAP PINS near the front edge of the AA14-4F010 board (see
Section 4).
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | AA14-4F010 |
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