.ut-cat{color:#333;font-family:Arial,Helvetica,sans-serif;line-height:1.5;} .ut-cat h4{color:#1a1a1a;font-size:1.15em;margin:1.5em 0 .5em;padding-bottom:.25em;border-bottom:2px solid #ccc;} .ut-cat h2{color:#1a1a1a;font-size:1.25em;margin:1.2em 0 .4em;} .ut-cat h3{color:#222;font-size:1.05em;margin:1em 0 .3em;} .ut-cat p{margin:.6em 0;} .ut-cat ul{margin:.5em 0;padding-left:1.4em;}.ut-cat li{margin:.25em 0;} .ut-cat img{max-width:100%;height:auto;} .ut-cat table{border-collapse:collapse;width:100%;margin:.5em 0;} .ut-cat th,.ut-cat td{border:1px solid #ddd;padding:6px 10px;text-align:left;vertical-align:top;} .ut-cat td strong{color:#222;} Overview The UT513A is the straightforward 5 kV insulation tester for routine maintenance and commissioning. It outputs test voltages up to 5 kV, reads insulation resistance up to 1 TΩ at ±(3%+5) accuracy, and is rated CAT III 600 V — the core capability for checking motor windings, cables, and switchgear without the extras you don't always need. It still runs a Polarization Index test for moisture and aging, displays leakage current, and discharges the circuit automatically when a test ends. A comparison function gives a quick pass/fail call, and results store on-board for transfer over USB. It's backed by UNI-T's nearly 40 years of test-meter manufacturing. Key Features Test voltage output up to 5 kV Insulation resistance up to 1 TΩ, accuracy ±(3%+5) Polarization Index (PI) timed test Automatic discharge after test Comparison function for pass/fail Auto-ranging measurement 18-set data storage with USB transfer CAT III 600 V safety rating UT513A Details 5 kV Insulation Testing The UT513A delivers test voltage up to 5 kV and reads insulation resistance up to 1 TΩ, covering the routine high-voltage checks in motor, cable, and switchgear maintenance with auto-ranging that keeps readings on-scale without manual range selection. Polarization Index A timed PI measurement flags moisture and aging in windings that a quick spot reading would pass, so early insulation degradation shows up before it becomes a failure. Discharge & Comparison The circuit discharges automatically at the end of each test, and a comparison function sets a pass/fail threshold for fast, consistent go/no-go decisions across multiple test points. Field Build A compact handheld rated CAT III 600 V, the UT513A stores 18 result sets and transfers them to a PC over USB for basic record-keeping. Compare the UT513 Series UT512E UT513A UT513B UT513C Max test voltage 2500 V 5 kV 5 kV 5 kV Max insulation resistance 2.5 TΩ 1 TΩ 2 TΩ 5 TΩ Voltage stepping (10% of range) Yes — Yes Yes PI / DAR diagnostics PI PI PI / DAR PI / DAR Capacitance measurement 2 µF — — 0.01–15 µF Data storage 999 sets 18 sets 999 sets 999 sets Bluetooth app — — — Yes Safety rating CAT IV 600 V CAT III 600 V CAT IV 600 V CAT IV 600 V Applications Routine insulation checks on motor and generator windings; cable and feeder testing; switchgear and panel maintenance; and commissioning checks before equipment is energized. Frequently Asked Questions What is the maximum test voltage and resistance range? The UT513A outputs up to 5 kV and reads insulation resistance up to 1 TΩ. Does the UT513A measure Polarization Index? Yes — it runs a timed PI test to reveal moisture and aging in insulation. Should I choose the UT513A or the UT513B? The UT513A is the basic 1 TΩ / CAT III model for routine testing; step up to the UT513B for a 2 TΩ range, CAT IV 600 V, stepped-voltage profiling, DAR, and 999-set storage. Specifications DC Voltage In 600 V AC Voltage In 600 V Max Resistance 1 TΩ Resistance Accuracy ±(3% + 5) Max IR Test Voltage 5000 V Insulation Resistance Yes Test Voltage Accuracy 0% – 20% Short Circuit Current > 3.5 mA Charge Current 3.5 mA Auto Ranging Yes Comparison Function Yes Polarization Index Yes Auto Discharge Yes Interface USB Data Storage 18 CAT Rating CAT III 600 V Weight 2 kg Dimensions 202 × 155 × 94 mm Documentation UT513A Datasheet UT513A User Manual
