# Tektronix TCP305A AC/DC Current Probe, DC to 50 MHz, 50 A DC (Pre-Owned) # Tektronix TCP305A AC/DC Current Probe, DC to 50 MHz, 50 A DC (Pre-Owned) ## Key Features At A Glance - Maximum wire voltage ratings vary by model from 150 V CAT II up to 600 V CAT I & II (300 V CAT III) — match the model rating to your circuit - AC/DC current measurement spanning DC to 100 MHz bandwidth and up to 750 A DC (derated with duty cycle) across the family - DC accuracy of ±3% of reading (±1% of reading typical) on all models - Split-core construction allows easy connection around an existing conductor - Automatic on-screen scaling and units readout reduces measurement errors (requires a TDS TEKSCOPE or TekConnect oscilloscope with TCA-BNC adapter) - Low insertion impedance reduces device-under-test loading; low DC drift and noise aid low-level current measurements - Status indicators for degauss, probe open, overload, not-terminated-into-50 Ω, and noncompatible probe type - Connects via TEKPROBE Level II, TekConnect (TCA-BNC), or TekVPI (TPA-BNC) oscilloscope interfaces The Tektronix TCP300 and TCP400 Series is an AC/DC current measurement family built from current-probe-and-amplifier pairings. When connected to Tektronix oscilloscopes equipped with TEKPROBE Level II, TekConnect (with a TCA-BNC adapter), or TekVPI (with a TPA-BNC adapter) interfaces, current measurements and calculations are simple and direct. The TCPA300 amplifier is used with the TCP312A, TCP305A, or TCP303 probes, while the TCPA400 amplifier is used with the TCP404XL probe. The series provides development and analysis solutions for designers, installers, and service personnel working in telecom, data comm, computer, and semiconductor power electronics environments. Listed applications include power supplies (switching and linear); semiconductor devices such as SCRs, IGBTs, MOSFETs, CMOS, and BJTs; power inverters and converters; electronic ballasts; industrial and consumer electronics; mobile communications including phone, satellite, and relay stations; motor drives; and transportation systems such as electric vehicles, electric trains, locomotives, and avionics. ValueTronics stocks this equipment in our own 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every used unit is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received. ## Brand Heritage Tektronix was acquired by Danaher Corporation in 2007 and, in 2016, became part of Fortive Corporation when Fortive was spun off from Danaher. The Tektronix brand name has been retained throughout these ownership changes. ## Compare Other Models in This Series The TCP300 and TCP400 Series spans the gap from low-level milliamp measurements to very high current levels using two amplifiers and four probes. The TCPA300 amplifier, used with the TCP312A, TCP305A, or TCP303 probes, provides current measurement capabilities of 30 A, 50 A, and 150 A DC continuous respectively. For higher current levels, the TCPA400 amplifier with the TCP404XL current probe measures 500 A DC continuous and 750 A DC continuous derated with duty cycle. Higher-frequency performance is available with the TCP312A and TCPA300, providing ≥100 MHz bandwidth at a maximum current of 30 A DC. Each pre-owned model below is its own dedicated product page with condition-matched pricing. Select the probe-and-amplifier pairing that matches your bandwidth and current requirements, and review that model's own specifications before ordering. The models differ primarily in bandwidth, current capability, and rise time. The TCP312A pairing reaches DC to 100 MHz at 30 A DC with ≤3.5 ns rise time; the TCP305A pairing reaches DC to 50 MHz at 50 A DC with ≤7 ns rise time; the TCP303 pairing reaches DC to 15 MHz at 150 A DC with ≤23 ns rise time; and the TCP404XL pairing reaches DC to 2 MHz at 500 A DC continuous (750 A derated) with ≤175 ns rise time. Maximum wire voltage ratings and physical dimensions also vary across the family, from the compact TCP305A/TCP312A probes to the larger TCP303 and TCP404XL probes with their wider maximum conductor sizes. DC accuracy of ±3% of reading (±1% typical) is common to all models. See the comparison table for the per-model values. Model Bandwidth Max DC Current (Continuous) Rise Time **TCP305A** DC – 50 MHz 50 A ≤7 ns TCPA300 DC – 100 MHz — — TCPA400 DC – 50 MHz — — TCP312A DC – 100 MHz 30 A ≤3.5 ns Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Product Core & Specifications Specification Value Electrical Bandwidth DC – 50 MHz Rise time ≤7 ns DC accuracy ±3% of reading DC accuracy, typical ±1% of reading Lowest measurable current (±3% accuracy at DC; scope set to 1 mV/div and 20 MHz BW limited) 5 mA Maximum Amp-Second product, typical (based on amplifier range setting) 500 A·μS – 5 A/V; NA – 10 A/V AC-coupling low-frequency bandwidth, typical (low pass –3 dB point) <7 Hz Displayed RMS noise, typical (at 20 MHz bandwidth limit) ≤1.25 mA RMS Signal delay (to output BNC) 19 ns Insertion Impedance At 1 MHz 0.02 Ω At 10 MHz 0.1 Ω At 50 MHz 0.35 Ω Maximum Current Ratings — High-current sensitivity Range 10 A/V DC (continuous) 50 A RMS (sinusoidal) 35.4 A Peak 50 A Maximum Current Ratings — Low-current sensitivity Range 5 A/V DC (continuous) 25 A RMS (sinusoidal) 17.7 A Peak 50 A Maximum Wire Voltage Bare 150 V CAT II Insulated 300 V CAT II Physical Characteristics Length 20 cm (7.77 in) Width 6 cm (0.625 in) Height 3.2 cm (1.25 in) Weight 0.15 kg (0.33 lb) Maximum conductor size 5.0 mm (0.15 in) Cable length 1.5 m (60 in) > **Important:** The TCP312A, TCP305A, and TCP303 probes require a TCPA300 amplifier; the TCP404XL probe requires a TCPA400 amplifier. > **Important:** Automatic scaling and on-screen units readout requires a TDS TEKSCOPE oscilloscope or a TekConnect oscilloscope with the TCA-BNC adapter. > **Important:** For the DPO3000, MDO/MSO/DPO4000, MSO/DPO5000, and DPO7000 series oscilloscopes, the TPA-BNC adapter is required. > **Important:** TCP404XL: the 750 A DC continuous rating is derated with duty cycle (500 A DC continuous). > Recommended pairing: the power measurements deskew fixture (067-1478-00) listed for the TCP202A, TCP305A, TCP312A, and TCP303 probes supports time-aligned current measurements in power applications. ## About this Pre-Owned unit This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects. - Backed by a ValueTronics warranty. - Functional verification included before shipment. - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 1720.0 USD - 1846.0 USD - **Vendor:** Tektronix - **Type:** Curr Probe - **Tags:** Curr Probe, Inc., Manufacturers, Model 305, Pre-Owned, Product_used, TCP305, TCP305A, Tektronix ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 1720.00 USD | In stock | | NIST Traceable | 1811.00 USD | In stock | | NIST Traceable with Full Data | 1825.00 USD | In stock | | ISO IEC 17025 Accredited | 1846.00 USD | In stock | ## Images - Tektronix TCP305A AC/DC Current Probe, DC to 50 MHz, 50 A DC (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/tcp305a-tektronix-current-probe-used) > Updated: 2026-06-02