Yokogawa DR240 Manual do Utilizador descarregar pdf (Página 265)

14-20

IM DR232-01E

14.5 Specifications of Strain Input Module

Model Code, Number of Input Channels, Terminal Configuration, Shortest

Measurement Interval and Values of Built-in Resistors

Model Code Number of Input Terminal Shortest Measurement Built-in

Channels Configuration Interval Resistor

DU500-12 10* Clamp 0.5 s 120 Ω

DU500-13 10* Clamp 0.5 s 350 Ω

DU500-14 10* NDI** 0.5 s External

*: Requires the space of two slots.

**: Recommended by the Japanese Nondestructive Inspection Association

Method of Input

Non-balanced floating input, with isolation between channels (separated channels)

Resolution of A/D Conversion

Equivalent to reading on 20000 full scale

Integral Time of A/D Conversion

Manual or automatic selection between 20 ms (50 Hz), 16.7 ms (60 Hz) and 100 ms (10 Hz)

(Except, auto switch does not function on the subunit (DS400/DS600) of a DC power supply

model. Selecting "AUTO" will set the A/D integration time to 20 ms (50 Hz).)

Types of Input

Signals from strain gauge or strain-gauge sensor

Connection Methods

Single-gauge, opposed-side two-gauge, adjacent-side two-gauge or four-gauge configuration

(Configured with built-in DIP switches for DU500-12 and DU500-13)

Applicable Gauge Resistance

100 to 1,000 Ω

The DU500-12 and DU500-13 modules contain 120-Ω and 350-Ω resistors, respectively.

Bridge Voltage

Fixed to 2 V DC (±5% accuracy with a correction function)

Gauges

2.00 (with scaling capability)

Balancing

Automatic

Range of Balancing

Equivalent to ±10,000 µe (for single-gauge method)

Measuring Ranges and Accuracies

As described below, under the following operating conditions:

Ambient temperature: 23 ±2°C; ambient humidity: 55 ±10% RH; power supply voltage: 90 to 250

VAC (AC power supply)/10 to 32 VDC (the subunit of a DC power supply model only); power

supply frequency: 50/60Hz within ±1% (AC power supply); warm-up time 30 minutes or more;

vibrations and others not affecting instrument operation.

Gauge Method Measuring Range Accuracy Resolution

Single-gauge –2000 to 2000 µε 0.5% of Range 0.1 µε

–20000 to 20000 µε 0.3% of Range µε

–200000 to 200000 µε 0.3% of Range 10 µε

Two-gauge –1000 to 1000 µε 0.5% of Range 0.1 µε

10000 to 10000 µε 0.3% of Range 1 µε

–100000 to 100000 µε 0.3% of Range 10 µε

Four-gauge –500 to 500 µε 0.5% of Range 0.1 µε

–5000 to 5000 µε 0.3% of Range 1 µε

–50000 to 50000 µε 0.3% of Range 10 µε

The Accuracies and Resolutions of the DU500-12 and DU500-13 models, do not include the influence of

the internal- and contact-resistance of the jumper setup switch.

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