High-Voltage Insulation Testers Compared: 3 Listings
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High-voltage insulation testing means applying a test voltage of 1000 V or more to cable, switchgear, transformers and similar equipment. This page compares three listings whose titles or highlights name a high-voltage insulation tester. Each listing states a maximum output voltage of at least 1000 V, which is the rule used to include it here.
The three listings differ sharply in their top figures and in how much they say about their outputs. One is a 5 kV unit with a PV module note, one is a 5000 V step unit with six output settings, and one is a 1000 V unit with a short title and little bullet detail. Listing data was checked on 2026-10-20.
Quick answer
The HIOKI IR5051 states the highest output in this group, up to 5 kV, and the highest measurement figure, up to 10 TΩ. Its listing also gives a CAT III 2000 V and CAT IV 1000 V rating and an IP65 carry case. The GOLDCHAMP GCCA-6688B gives six output settings from 100 V to 5000 V and a measurement range to 200 GΩ. The MS5203 names 1000 V and 10 GΩ in its title, and its bullets give no output steps.
If you need a 2500 V setting that the listing names, the GOLDCHAMP is the one that lists it. If you need a stated CAT rating, the HIOKI and the MS5203 both give one. The GOLDCHAMP’s specification field gives IEC 1010 and no CAT rating.
Comparison table
| Listing | Stated output voltages | Stated measurement range | Stated safety rating | Weight and included parts |
|---|---|---|---|---|
| GOLDCHAMP GCCA-6688B digital megohmmeter (first listing) | 100, 250, 500, 1000, 2500 and 5000 V (bullets); 500, 1000, 2500 and 5000 V (highlight) | 0.1 MΩ to 200 GΩ (bullets); 1 MΩ to 200 GΩ (highlight) | IEC 1010 (specification field); Overvoltage Category II (bullets) | 7.1 ounces; multimeter (specification field) |
| Yachuang MS5203 high voltage insulation resistance tester (second listing) | 1000 V (title) | 10 GΩ (title) | CE, CAT III 1000V and CAT IV 600V (specification field) | 0.353 ounces; MS5203 tester (specification field) |
| HIOKI IR5051 high voltage insulation tester (third listing) | Up to 5 kV (bullets) | Up to 10 TΩ (bullets) | CAT III 2000 V, CAT IV 1000 V (bullets) | 3.74 pounds; IP65 carry case (bullets) |
The first listing: GOLDCHAMP GCCA-6688B digital megohmmeter
The listing names GOLDCHAMP and model GCCA-6688B, with a title for a digital megohmmeter for high-voltage cable. Its highlight field lists output voltages of 500 V, 1000 V, 2500 V and 5000 V, and a resistance range of 1 MΩ to 200 GΩ, with a backlight display and data hold. The specification fields give battery power, a color of GC-6688B-OR, a weight of 7.1 ounces, an upper temperature rating of 40 °C and IEC 1010 as the standard.
The bullets describe an auto-ranging megohmmeter from 0.1 MΩ to 200 GΩ with an accuracy of 3% to 10% plus five digits. They describe a shield terminal (COM) that the listing says removes surface leakage errors. The output steps are 100 V, 250 V, 500 V, 1000 V, 2500 V and 5000 V, with a short-circuit output current of about 1 mA. The bullets also describe a high-voltage LED that flashes during output, a TEST/STOP button that halts the voltage, and automatic discharge of residual charge.
- Output steps: 100, 250, 500, 1000, 2500 and 5000 V (bullets)
- Resistance: 0.1 MΩ to 200 GΩ (bullets); 1 MΩ to 200 GΩ (highlight)
- Accuracy: 3% to 10% plus five digits (bullets)
- AC voltmeter: 1 V to 750 V, 40 Hz to 400 Hz (bullets)
The listing gives a time limit of 10 seconds for readings below 5 MΩ at any rated voltage. It also describes a 1999-count backlit LCD and a one-year quality assurance period. The highlight and the bullets disagree on the lower end of the resistance range, which is covered in the worked example.
The second listing: Yachuang MS5203 high voltage insulation tester
The listing names Yachuang and model MS5203. Its title describes a high voltage digital insulation resistance tester with DCV and ACV detection, a 1000 volt rating and 10 gigaohm detection. The specification fields give battery power, a minimum operating voltage of 0.1 volts DC, a measurement type of multimeter, a compact style, a color of black and a weight of 0.353 ounces. The standards are listed as CE, CAT III 1000V and CAT IV 600V.
The bullets describe the unit as a professional instrument for ground resistance measurement on electrical equipment, with a large LCD, a gear selector for the measurement range and double insulation protection. They say it suits high voltage tower measurement, grid grounding and lightning rod work. The bullets also tell the user to confirm the rotary switch position and the lead connection before measuring.
- Output: 1000 V (title); no output steps listed in the bullets
- Resistance: 10 GΩ (title)
- Safety: CE, CAT III 1000V and CAT IV 600V (specification field)
- Weight: 0.353 ounces (specification field)
The listed weight of 0.353 ounces, about 10 g, is much lighter than the other two listings. Confirm it on the product page before you plan carrying or mounting the unit.
The third listing: HIOKI IR5051 high voltage insulation tester
The listing names HIOKI and model IR5051, with a title for a high voltage insulation tester. Its specification fields give dimensions of 10 x 7.68 x 3.5 inches, a weight of 3.74 pounds, and a first available date of September 29, 2025. No battery type, output step list or display detail appears in the specification fields.
The bullets are the most specific of the three about use. They describe testing insulation resistance while PV modules are live, without shutting down generation. They state a high voltage output of up to 5 kV and stable measurements up to 10 TΩ. They describe PI, DAR and DD values calculated automatically to show insulation degradation, a CAT III 2000 V and CAT IV 1000 V safety rating, and an IP65 carry case. They also mention USB and wireless data transfer with an optional adapter, and Excel direct input.
- Output: up to 5 kV (bullets)
- Measurement: stable readings up to 10 TΩ (bullets)
- Diagnostics: PI, DAR and DD values calculated automatically (bullets)
- Safety: CAT III 2000 V, CAT IV 1000 V (bullets); IP65 carry case (bullets)
How these three were chosen
Each listing above names a high-voltage insulation tester, and each states an output of at least 1000 V in its title, highlight or bullets. Other products in related results, including standard insulation testers rated below 1000 V, GFCI testers and multimeters, are left out because they do not meet that output rule. Figures come from each listing’s own fields and bullets, and all three were checked on 2026-10-20.
Worked example: the top measurement figure in each listing
Compare the highest stated measurement figure in each listing. The HIOKI states 10 TΩ, which is 10,000 GΩ. The GOLDCHAMP states 200 GΩ, and the MS5203 states 10 GΩ. The HIOKI’s ceiling is therefore 50 times the GOLDCHAMP’s and 1,000 times the MS5203’s. The MS5203 figure appears only in its title, so it is less well supported by the listing text than the other two.
Next take a 2500 V test, a voltage that appears in one listing’s output steps. The GOLDCHAMP lists a 2500 V step by name. The HIOKI states an output of up to 5 kV, but its listing does not list its intermediate steps, so a 2500 V setting cannot be confirmed from the text. The MS5203 is rated at 1000 V in its title and cannot be read as offering 2500 V.
What the listings do not say
- The MS5203 listing gives no output steps and no output current, only its 1000 V title figure.
- The HIOKI listing gives no battery type, no output step list and no display detail in its specification fields.
- The GOLDCHAMP highlight and bullets disagree on the lower end of the resistance range, 1 MΩ against 0.1 MΩ.
- None of the three states a measurement time for a full reading at its top voltage.
- None of the three gives a discharge time after the test stops, apart from the GOLDCHAMP’s automatic discharge statement.
Related buying guides
For a wider view of this category, the megohmmeter tester guide covers meters with a megohm range, the insulation resistance tester guide covers the general models, and the insulation resistance test equipment guide covers the supporting gear.
FAQ
Which listing states the highest output voltage?
The HIOKI IR5051 states an output of up to 5 kV in its bullets. The GOLDCHAMP lists 5000 V as its top step, and the MS5203 lists 1000 V in its title.
Which listing has a stated CAT rating?
The HIOKI states CAT III 2000 V and CAT IV 1000 V. The MS5203 states CAT III 1000V and CAT IV 600V in its specification field. The GOLDCHAMP states IEC 1010 and Overvoltage Category II in its bullets, with no CAT III or CAT IV rating.
Which listing gives the largest measurement figure?
The HIOKI IR5051 states stable measurements up to 10 TΩ, which is larger than the GOLDCHAMP’s 200 GΩ and the MS5203’s 10 GΩ.
Why does the GOLDCHAMP listing give two lower limits?
Its highlight says 1 MΩ and its bullets say 0.1 MΩ for the bottom of the resistance range. The listing does not explain which is correct.
What should I confirm before buying?
Confirm the output voltage you need and whether that exact step is listed, the category rating for your equipment, and the weight and battery arrangement on the product page. Several of these listings leave those points out.
Bottom line
For the highest stated output and measurement figures, the HIOKI IR5051 leads on its own listing text, and its PV module use and IP65 case are the other stated points. The GOLDCHAMP is the one that names a 2500 V step and a six-step output set, with a lower-end conflict to check. The MS5203 gives a 1000 V and 10 GΩ figure in its title but little else in its listing text. Pick by the output voltage and rating your equipment needs, then confirm the figure on the product page.
