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Active Probes

TAP2500 - TAP3500 - TAP4000 Datasheet

The TAP2500, TAP3500 and TAP4000 Single-ended Active FET probes provide excellent high-speed electrical and mechanical performance required for today's digital system designs.

Key features

  • Outstanding electrical performance
    • High probe bandwidth
    • Fast probe rise time
    • Excellent signal fidelity
    • ≤0.8 pF input capacitance
    • 40 kΩ input resistance
    • -4 V to +4 V input dynamic range
    • -10 V to +10 VDC input offset range
    • ±30 V (DC + peak AC) Maximum input voltage (nondestructive)
  • Versatile mechanical performance
    • Small compact probe head for probing small geometry circuit elements
    • DUT attachment accessories enable connection to SMDs as small as 0.5 mm pitch
    • Robust design for reliability
  • Easy to use
    • Connects directly to oscilloscopes with the TekVPI™ probe interface
    • Provides automatic units scaling and readout on the oscilloscope display
    • Easy access to oscilloscope probe menu display for probe status/diagnostic information and to control probe DC offset
    • Remote GPIB/USB probe control through the oscilloscope
  • Applications
    • Verification, debug, and characterization of high-speed designs
    • Signal integrity, jitter, and timing analysis
    • Manufacturing engineering and test
    • Signals with voltage swings up to 8 Vp-p
TAP2500 TAP3500 TAP4000_51W1904412

TAP2500, TAP3500 and TAP4000 active probes for TekVPI™ probe interface

Selecting the right probe for your application is key to attaining the best signal fidelity in your measurements. Active probes provide truer signal reproduction and fidelity for high-frequency measurements. With our ultra-low input capacitance and unique interface, the TAP2500, TAP3500 and TAP4000 Single-ended Active FET probes provide excellent high-speed electrical and mechanical performance required for today's digital system designs.

Specifically designed for use and direct connection to oscilloscopes with the TekVPI™ probe interface, the TAP2500, TAP3500 and TAP4000 Active FET probes achieve high-speed signal acquisition and measurement fidelity by solving three traditional problems:

  • Lower DUT loading effects with ≤0.8 pF input capacitance and 40 kΩ input resistance
  • Versatile DUT connectivity for attaching to small SMDs
  • Preserves instrument bandwidth at the probe tip for up to 3.5 GHz oscilloscopes


All specifications are guaranteed unless noted otherwise. All specifications apply to all models unless noted otherwise.

Warranted electrical characteristics

Attenuation (probe only)
DC attenuation accuracy (probe only)
10:1 ±2% (excludes offset error)
Rise time (probe only)
<140 ps (TAP2500)
<130 ps (TAP3500)

Typical characteristics

Bandwidth (probe only)
≥2.5 GHz (TAP2500)
≥3.5 GHz (TAP3500)
≥4 GHz (TAP4000)
Bandwidth (probe only)
DC to ≥2.5 GHz (TAP2500)
DC to ≥3.5 GHz (TAP3500)
DC to ≥4 GHz (TAP4000)
Rise time (probe only)
≤115 ps (TAP4000)
Input capacitance
≤0.8 pF
Input resistance
40 kΩ
Input dynamic range
±4.0 V
Input offset range
±10 V
Maximum non-destructive input voltage
±30 V (DC + peak AC)
Propagation delay
5.3 ns

Physical characteristics

Probe head size
7.6 mm (0.30 in)
7.6 mm (0.30 in)
57.2 mm (2.25 in)
Other dimensions
Cable length
1300 mm (51 in)
1.55 kg (3.44 lbs); probes, accessories, and packaging
0.091 kg (0.2 lbs); probe only, using ME lab scale

Power requirements

The probe is powered directly by oscilloscopes with the TekVPI probe interface.

EMC, environment, and safety

0 °C to +50 ° (+32 °F to 122 °F)
-40 ° C to +71 °C (-40 °F to 160 °F)
5% to 95% Relative Humidity up to +30 °C (+86 °F)
5% to 85% Relative Humidity at 30 °C to +50 °C (+86 °F to +122 °F)
5% to 95% Relative Humidity up to +30 °C (+86 °F)
5% to 85% Relative Humidity at 30 °C to +75 °C (+86 °F to +167 °F)
Up to 4,400 m (14,436 ft)
Up to 12,192 m (40,000 ft)
Emissions compliance
EN 55011, Class A
Compliance labeling

C-Tick (Australia/New Zealand)

CE (European Union)

WEEE (European Union)

Ordering information

2.5 GHz Active Probe
3.5 GHz Active Probe
4 GHz Active Probe

Recommended accessories

IC Micro Grabber, Qty 2
SMA-to-Probe tip adapter
TekVPI calibration fixture (for PV)

Standard accessories

Description Quantity with TAP2500, TAP3500 or TAP4000 Reorder part number Reorder quantity
Y-lead adapter (2 each) and 3 in. ground lead (3 each) 1 set 196-3456-xx 1 set
Micro CKT test tip 2 each 206-0569-xx 1 each
Customizable ground lead (set of 5) 1 set 196-3482-xx 1 set
Color band kit (5 colored pairs) 1 set 016-1315-xx 1 set
Pogo pin ground (set of 10) 1 set 016-1772-10 1 set
Square pin socket (set of 10) 1 set 016-1773-10 1 set
Push-in probe tip (set of 10) 1 set 131-5638-11 1 set
Right-angle adapter (set of 10) 1 set 016-1774-xx 1 set
SureToe™ Adapter (set of 4) 1 set 131-6254-xx 1 set
Antistatic wrist strap 1 each 006-3415-xx 1 each
Nylon carrying case 1 each 016-1952-xx 1 each
Plastic accessory case 1 each 006-7164-xx 1 each
Instruction manual 1 each 071-1836-xx 1 each

Recommended oscilloscopes

Oscilloscopes with the TekVPI™ probe interface. For best probe support, download and install the latest version of the oscilloscope software from


One-year warranty covering all parts and labor.

Manual options

Opt. L5
Japanese manual
Opt. L7
Simplified Chinese manual

Service options

Opt. C3
Calibration Service 3 Years
Opt. C5
Calibration Service 5 Years
Opt. D3
Calibration Data Report 3 Years (with Opt. C3)
Opt. D5
Calibration Data Report 5 Years (with Opt. C5)
Opt. R3
Repair Service 3 Years (including warranty)
Opt. R5
Repair Service 5 Years (including warranty)
Opt. SILV600
Standard warranty extended to 5 years