Table of Contents

Product Overview

HF-TC-648 Transformer No-Load & Load Loss Tester adopts digital synchronous sampling technology to accurately measure true RMS values of voltage, current, power, power factor and other parameters for three-phase electrical equipment. Featuring fast measurement speed, high precision, easy operation, compact and elegant appearance, it is specially designed for transformer energy loss testing and can replace nine equivalent analog meters.

It is dedicated to testing transformer no-load loss, short-circuit loss, zero-sequence impedance and short-circuit impedance.
Reference Standard: DL/T 1256-2013

Main Features

Equipped with a 240×128 dot matrix LCD screen, simultaneously displaying three-phase voltage, current, low-side voltage, power, power factor and other parameters.
Capable of measuring no-load current, no-load loss, short-circuit voltage and short-circuit loss of various transformers.
Wide linear range, excellent repeatability and stable performance.
Ensures accurate power factor measurement from 0.000 to 1.000, especially suitable for low power factor load testing.
Convenient data hold function guarantees timeliness of measured data and easy operation.
Wide-range voltage circuit; maximum measurable voltage up to 750V. Accuracy maintained without manual range switching; instrument protected from wrong voltage range selection.
Large-screen high-brightness LCD, full Chinese menu and operation prompts for friendly human-machine interaction; touch buttons simplify operation.
Test data can be printed anytime via built-in micro printer.

Technical Specifications

Item	Specification
Product Name	HF-TC-648 Transformer No-Load & Load Loss Tester
Applicable Test Items	No-load loss, load loss, short-circuit voltage, zero-sequence impedance, no-load current
Reference Standard	DL/T 1256-2013
Voltage Range	0~500V (Max withstand 750V)
Current Range	0~60A, auto range switching
Voltage & Current Accuracy	±0.2% ± 2 digits
Power Accuracy	±0.5% (CosΦ＞0.1); ±1.0% (0.02＜CosΦ＜0.1)
Power Factor Range	0.000~1.000
Harmonic Analysis	2nd ~ 42nd harmonic, THD measurement
Display	240×128 LCD, real-time waveform display
Function	Waveform correction, temperature correction, data storage & printing, built-in RTC clock
Operating Temperature	-10℃ ~ +40℃
Insulation Test	AC 2kV / 1min; Insulation resistance ≥100MΩ
Dimensions	38cm × 28cm × 15cm
Net Weight	3kg

Packing List

No.	Description	Qty	Unit	Remarks
1	Main Tester Unit	1	Set	HF-TC-648 host
2	Voltage Test Cable Set	1	Set	3-phase voltage leads
3	Current Test Cable & Clamp	1	Set	For current signal access
4	AC220V Power Cord	1	Pcs	Mains supply cable
5	Thermal Printing Paper	2	Rolls	Spare for built-in printer
6	Operation Manual (English & Chinese)	1	Copy
7	Factory Calibration Certificate	1	Copy
8	Warranty Card	1	Copy
9	Shockproof Carry Case	1	Pcs	For transportation protection
10	Spare Fuse	2	Pcs	Consumable spare part

FAQ for Transformer No Load and Load Loss Tester

Q1: What test items can this instrument complete?

A1: It measures transformer no-load current, no-load loss, load loss, short-circuit voltage, zero-sequence impedance, three-phase voltage and current, power factor, harmonic components and waveform distortion.

Q2: Which industry standard does the tester comply with?

A2: It is designed according to DL/T 1256-2013, suitable for factory inspection and on-site acceptance test of power transformers.

Q3: Does it support automatic range switching?

A3: Yes. The current channel is 0~60A with automatic range switching. The voltage channel supports wide-range measurement up to 750V, no manual gear shifting needed.

Q4: Can it realize correction for transformer loss testing?

A4: It supports automatic waveform distortion correction, temperature correction, voltage correction and current correction, very suitable for users without large-capacity test power supply.

Q5: What is the accuracy under low power factor conditions?

A5: Power accuracy: ±0.5% when CosΦ＞0.1; ±1.0% within 0.02＜CosΦ＜0.1. It performs well for low power factor no-load tests.

Q6: Does the tester support harmonic measurement?

A6: Yes. It can analyze the 2nd ~ 42nd harmonic content and total harmonic distortion rate, and display real-time voltage and current waveforms.

Q7: Can test data be saved and printed?

A7: All test records can be stored. Equipped with a micro printer, users can print test results on site at any time. The built-in clock saves time stamps together with data.

Q8: What are the working environment requirements?

A8: Operating temperature range: -10℃ ~ +40℃. Avoid strong electromagnetic interference, humid and dusty environment.

Q9: What is the insulation safety specification of the instrument?

A9: The insulation resistance between input terminals and casing ≥100MΩ. The power port can withstand AC 2kV withstand voltage test for 1 minute.

Q10: What method is adopted for power measurement?

A10: It uses the two-wattmeter method to calculate total active power, collecting power data of phase A and phase C, which meets standard three-phase transformer test requirements.

Q11: Is the device portable for field testing?

A11: Yes. Net weight only 3kg with compact dimensions 38cm×28cm×15cm, convenient to carry to substation sites.

Q12: Do I need to worry about damage caused by wrong voltage range?

A12: No. The voltage circuit adopts wide-range design without range selection. Misoperation caused by wrong gear selection can be avoided.

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