.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 Rated CAT IV 600 V, the UT513B applies selectable test voltages from 250 V to 5 kV and reads insulation resistance up to 2 TΩ — the headroom you need for medium-voltage motors, transformers, switchgear, and long cable runs. It runs the timed diagnostics that tell you whether insulation is actually healthy or just passing a spot check: Polarization Index, Dielectric Absorption Ratio, and a 10%-of-range stepped-voltage profile that surfaces weaknesses a single fixed-voltage reading misses. Leakage current shows live during the test, the circuit auto-discharges when you're done, and a high-voltage alarm flags an energized lead. The instrument stores 999 result sets and exports over USB for compliance records, and a 14.8 V 5200 mAh rechargeable pack carries a full day of field testing. It's backed by UNI-T's nearly 40 years of test-meter manufacturing. Key Features Five selectable test voltages: 250 V, 500 V, 1000 V, 2500 V, 5000 V Insulation resistance up to 2 TΩ, accuracy ±(5%+5) PI (Polarization Index) and DAR timed diagnostics with 0 s–99 m 59 s timer 10%-of-range stepped-voltage profiling for insulation stress testing Live leakage-current display and automatic discharge after test High-voltage output alarm Comparison function for pass/fail against a set threshold 999-set storage with USB transfer to PC CAT IV 600 V; 14.8 V 5200 mAh rechargeable Li-ion UT513B Details Multi-Voltage Insulation Testing Five fixed test voltages from 250 V to 5 kV let you match the test to the asset — low voltages for control and electronics wiring, 2.5 kV and 5 kV for motor windings, transformers, and medium-voltage cable. Resistance reads up to 2 TΩ, so modern high-resistance insulation stays on-scale. PI & DAR Diagnostics The UT513B times the resistance curve to calculate Polarization Index and Dielectric Absorption Ratio. Both separate genuinely dry, sound insulation from windings that read acceptable cold but are holding moisture or contamination — the difference between a motor you return to service and one you flag. Stepped-Voltage Profiling Beyond a fixed-voltage reading, the UT513B steps the test voltage in 10% increments across the selected range. Watching how resistance responds as stress rises exposes marginal insulation that a single endpoint reading reports as a pass. Auto-Discharge & High-Voltage Alarm Capacitive test objects store charge. The UT513B discharges the circuit automatically when a test ends, and a high-voltage alarm warns whenever a lead is live — the safety basics you want on a 5 kV instrument. Data Logging & Transfer Store up to 999 result sets on the instrument and move them to a PC over USB for reports and asset records. The comparison function sets a pass/fail threshold so repeat tests stay consistent across equipment and across technicians. Field Build A 14.8 V 5200 mAh rechargeable lithium pack runs a full testing day, and the CAT IV 600 V rating covers work on industrial distribution and outdoor utility equipment. 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 Rotating-machinery winding insulation on motors and generators; transformer and switchgear maintenance; cable and feeder testing on medium-voltage runs; and panel and equipment commissioning where insulation has to be verified before energizing. Frequently Asked Questions What test voltages does the UT513B provide? Five selectable steps: 250 V, 500 V, 1000 V, 2500 V, and 5000 V. What do PI and DAR tell me? Both are timed ratios that reveal moisture and contamination in insulation that a single resistance reading can miss. How is the UT513B different from the UT513A and UT513C? The UT513A is the basic 1 TΩ / CAT III model; the UT513B reads to 2 TΩ with stepped-voltage profiling at CAT IV; the UT513C extends to 5 TΩ and adds capacitance measurement and a Bluetooth app. Specifications Test Voltages 250 V / 500 V / 1000 V / 2500 V / 5000 V Insulation Resistance up to 2 TΩ IR Accuracy ±(5% + 5) DC Voltage 30 to 1000 V, ±(3% + 5) AC Voltage 30 to 750 V, ±(3% + 5) Test Current 0.01 nA to 3.5 mA Short-Circuit Current ≈3.5 mA PI / DAR Yes Timer Measurement Yes (0s to 99m 59s) Stepping Voltage 10% of range Comparison Function Yes Auto Discharge Yes High Voltage Alarm Yes Data Storage 999 sets Data Communication USB Safety Rating CAT IV 600 V Power 14.8 V 5200 mAh Li-ion (rechargeable) Dimensions (L × W × D) 238 × 166 × 90.5 mm Weight ≈1800 g Documentation UT513B Datasheet UT513B User Manual
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