top of page
This item is an excellent condition AVO/Biddle Three-Phase TTR Transformer Turn-Ratio Test Set. Calibrated September 3, 2025 to NIST standards. Includes Certificate of Calibration, hard case, TTR test cable, X cable, H cable, Ground cable, Remote cable, power cord and 180 day warranty. All pictures are of the actual unit and accessories.
 
This item comes with a 6 Month (180 day) warranty. Every pre-owned unit we offer goes through meticulous inspection and NIST calibration to guarantee its reliability and durability.
 
We Calibrate your Test Equipment! Contact us for more information on Calibration by visiting stratatek.com/calibration
 
Any questions or clarifications, feel free to ask     
Please see our other items!  Visit Stratatek.com
 
Item is in stock and located in Texas.
 
International Buyers – Please Note: Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. For more information of clarification, please ask.
 
Will ship worldwide. We make our best efforts to get you the best shipping prices. Contact us for other international rates and we will be pleased to give you a quote. We accept VISA / Mastercard. Paypal is also accepted. Sales to within Canada are subject to 5% GST.  Ontario sales subject to 13% HST.

Megger AVO/Biddle 550503 Three-Phase TTR Test Set - NIST Calibrated

$3,799.00Price
Quantity

  • The Megger (AVO/Biddle) 550503 Three-Phase TTR is a portable, automatic transformer turns-ratio test set for quickly and accurately measuring turns ratio, excitation current, and phase-angle deviation on power, distribution, and instrument transformers. It supports simultaneous three-phase testing, stores up to 200 test results, and connects to a PC via RS-232. Rugged and field-ready, it is ideal for substations, manufacturing, or on-site maintenance.

  • 1. Electrical Input

    • 120 V AC ±10%, 50/60 Hz, 100 VA (550503)

    • Optional 230 V AC ±10% (550503-47)

    2. Test Voltage

    • 8 V, 40 V, 80 V RMS (auto or manual)

    3. Measurements

    • Turns Ratio Range: 0.8–4,000 (8 V), 0.8–15,000 (40 V), 0.8–20,000 (80 V)

    • Turns Ratio Accuracy: ±0.1% (low/mid range)

    • Excitation Current: 0–500 mA

    • Phase Deviation: ±90°, ±3 minutes accuracy

    4. Data & Storage

    • Stores 200 test records

    • RS-232 connection for PC or printer

    5. Display

    • LCD (256 × 128 dots)

    • Quick-Test or full analysis mode

bottom of page