The Lightest Frequency Response Winding Deformation Detection Instrument
-No need to connect notebook computer, the tester itself can complete the transformer winding
deformation test by frequency response method.
-The sweep frequency range can reach 10 Hz to 10 MHz, and the measurement accuracy of the
attenuation multiple of the output frequency stable response is high.
-Printable Frequency Response Curve and Test Data with Miniature Printer
-Automatic evaluation of three-phase correlation of test results can be completed according to
DLT-911 standard
No need to connect to laptop
GD902 frequency response tester can be accomplished by itself. The test results
can be stored and printed. There is no need to connect the laptop computer.
The single tester is only 5 KG, which is very convenient to carry at site.
More test data can be stored when testing with computer controlled tester,
and test results can generate standard WORD report documents.
Sweep frequency Wide Range
Linear sweep： 0.5KHZ-2MHz
Section sweep：50Hz – 2000KHz
Self-contained Microprinter
Wide-paper micro-printer is built in the tester. Users can print the frequency response curve
and the attenuation multiple data corresponding to the curve obtained by the test through the
wide-paper micro-printer.
Automatic assessment
DLT-911 standard evaluation program is built in, which can automatically calculate the
three-phase correlation coefficient R according to the response multiple data of transformer
three-phase windings. It can provide a reference for users to analyze the test results
Function and application
1.Check the frequency response data of transformer windings during routine test of power transformer
maintenance
2.When the power transformer leaves the factory, the frequency response data of the winding of the
transformer are measured as the characteristic fingerprint information of the transformer.
3.After the short circuit of power transformer occurs, the frequency response data of power transformer
are measured and compared with the test data before the short circuit to check whether the transformer
winding has been deformed.
4.Automatically produce WORD format test report based on test results.
5.Automated Wide Paper Microprinter Printing Test to Obtain Curves and Data.
6.Automatic evaluation of test results according to DLT-911
Technical data
1. Two different sweep modes： Linear sweep，Section sweep；
Linear sweep： 0.5KHZ-2MHZinterval0.5KHZ 2000 dots
Section sweep：50HZ-100HZinterval2HZ25 dots
100HZ-1KHZinterval 20HZ45 dots
1KHZ -10KHZinterval 50HZ 180 dots
10KHZ-100KHZinterval 0.2KHZ 450 dots
100KHZ – 500KHZ interval 0.5KHZ 800 dots
500KHZ – 2000KHZ interval 1KHZ 500 dots
2.Test range：(-100dB） - （+20dB）
3.Test accuracy：0.1dB；
4.Frequency accuracy：<0.01%；
5.Signal input impedance：>1M Ω
6.Signal output impedance：50 Ω；7.Repeat test：99.5%；
8.Size (Length, Width and Height) 300 X 340 X 120 (mm)
9.Size of Aluminum Alloy Transport Box (Length, Width and Height)
310 X400 X 330 (mm)
10.Instrument mainframe weight: 5KG;
11.Working temperature: - 10ºC~50ºC;
12.Ambient humidity < 90%
Accessories
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Description
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Qty
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Host
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1 unit
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Power supply cable
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1 unit
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Test cable
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1 set
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Accessories bag
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1 unit
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USB（AA）
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1 unit
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Disk
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1 unit
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Fuse 0.5A
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3 unit
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Print paper
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1 unit
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Operating manual
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1 unit
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Calibration report
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1 unit
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0.1Hz VLF AC/DC Hipot tester
