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參數(shù)資料
| 型號(hào)： | 77LD1-12C110-01 |
| 英文描述： | Converter |
| 中文描述： | 轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 2/7頁(yè) |
| 文件大?。?/td> | 297K |
| 代理商： | 77LD1-12C110-01 |
Apex Signal,
A Division of NAI, Inc.
631.567.1100/631.567.1823(fax) 1-31-01 S 77 LD1 A001 REV B 1.2
170 Wilbur Place, Bohemia, NY, 11716,USA
www.naii.com
/ e-mail:sales@naii.com Code:OVGU1 Page 2 of 7
The D0 Test is used to check the card and the PCbus interface. All channels are disconnected from the outside
world, allowing the user to write any number of input positions to the card and then read the data from the interface.
External excitation is not required.
SPECIFICATIONS:
Number of channels:
Resolution:
Accuracy:
Bandwidth:
Input format:
Input voltage
Excitation voltage:
4, 8, or 12 (see part number)
16-bit
0.025% FS
10% of excitation to 100 Hz max. BW
and tracking
rate can easily be customized
.
LVDT or RVDT
Autoranging from 2.0 to 28 Vrms. Transformer isolated.
Not required for computation of output but should be connected to allow card to
check for excitation loss.
40 k
min. at 360 Hz
Specify between 360 Hz to 10 kHz, (See Part Number)
Automatically compensates for phase shifts between the transducer excitation and
output up to
±
60
°
(3 or 4-wire units ignore phase shift)
Three powerful test methods are described in the Programming Instructions.
+ 5 VDC at 0.35 A
±12 VDC at 0.1 A without Excitation; 1.1 A for 5 VA Excitation Output
0°C to +70°C
-45°C to +85°C.
20 oz.
Input Impedance:
Frequency:
Phase shift:
Wrap around Self Test:
Power:
Temperature, operating:
Storage temperature:
Weight:
EXCITATION:
Voltage:
Frequency:
Regulation:
Output power:
Optional
(See part number).
2.0-28 Vrms programmable (resolution 0.1 Vrms) or 115 Vrms fixed. Accuracy
±
2%.
360 Hz to 10 kHz
±
1% with 1 Hz resolution.
10% max., no load to full load.
5 VA max. at 40
°
min. inductive.
Principals of LVDT Operation :
Typically, the LVDT primary is excited by an ac source, causing a magnetic flux
to be generated within the transducer. Voltages are induced in the two secondaries, with the magnitude varying with
the position of the core. Usually, the secondaries are connected in series opposition, causing a net output voltage of
zero when the core is at the electrical center. When the core is displaced in either direction from center, the voltage
increases linearly either in phase or out of phase with the excitation depending on the direction.
Interfacing the LVDT to the Converter
Two common connection methods are:
1. Primary as reference (two-wire system)
This method of connection converts the widest range of LVDT sensors and. is the most sensitive to excitation
voltage variations, as well as temperature and phase shift effects.
2. Derived reference (three/four-wire LVDT)
The LVDT is again excited from the primary side, but the converter reference is the sum of A + B that has
constant amplitude for changing core displacement. This system is insensitive to temperature effects, phase
shifts and oscillator instability and solves the identity (A-B)/(A+B)
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