7525 查看數據表（PDF） - Toshiba

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7525

X-ray Thickness Gage

Toshiba 

As shown in the sample calibration curve shown

below (Figure 3), the measurement range is

divided into several individual measurement

ranges. The calibration curve is expressed as a

combination of the individual calibration curves in

each measurement range.

memory. During measurement, the detector output

is read in and then the thickness is calculated from

the stored calibration curve and output in the form

of analog or digital signal.

The microcomputer has a state-of-the-art 32-bit

microprocessor for high-speed calculations.

Specifications

Detector

output

Range 0 Range 1 Range 2 Range 3 Range 4 Range 5 Range N

                    → Thickness

Figure 3 Calibration Curve

The X-ray generator, detector and other electrical

circuits on the X-ray thickness gage are subject to

drift as time passes, so the gage must be calibrated

at periodical intervals. Two calibration methods

are used for this purpose: Full calibration (in

which all calibration curves in the entire

measurement range are recreated) and Calibration

(in which the calibration curve in only one

measurement range is recreated). Full calibration

requires about two minutes and calibration

requires about five seconds. This combination of

two calibration methods is a unique Toshiba

innovation unlike the methods used by any other

company. As the calibration curve is created by

predetermined calibration points, Full calibration

can be performed regardless of settings.

Using these two calibration methods, it is possible

to, for example, perform Full calibration two to

three times daily to maintain the measurement

accuracy in the measurement range, and perform

calibration near the nominal thickness during the

short period of time when no strip is present in the

X-ray beam (such as during coil changing, etc.) to

eliminate drift. This allows setup to be performed

with great precision when the strip is present in the

X-ray beam.

When the calibration curve is created, standard

plates are automatically inserted, the detector

output is read in and the calibration data is

calculated and stored in the microcomputer

General Specifications

Measured materials: Mild steel strip

Measurement range: 1.00 to 16.00mm

(0.85 to 17.92mm pure steel equivalent)

Range for setting compensation:

± 15.00% (based on pure steel)

Setting accuracy:

± SQRT [(linearity)2 + (reproducibility)2 +

(noise)2]

This is the accuracy when a test sample for

accuracy test is used offline.

Measuring air gap height of 750mm and time

constant of 30ms.

Linearity: Max. ± 0.1% of set thickness (2σ)

Reproducibility:

Max. ± 0.05% of set thickness or ± 0.05µm,

whichever is greater (2σ)

Noise:

Thickness(mm) Noise(%)

1 to 7.99

Max.±0.12%

8 to 13.99

Max.±0.20%

14 to 15.99 Max.±0.24%

(1.65σ)

Drift:

Max. ± (0.2% of set thickness + 0.5µm)/8h

Measuring head

Changes in air density to max. cooling water

temperature variations ± 3°C and max.

temperature variations around measuring

head ± 5°C are not included.

Max. temperature variations around

equipment cabinet/driving control box ± 5°C.

Response time:

Max. 30ms (response 63% when thickness of

2mm is changed in 100µm increments)

Calculation period: 10ms

Calibration time:

For full calibration Max. 150s

For calibration

Max. 5s

For setup Max. 20ms

No. EJD-069

4

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