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Test Leads - Oscilloscope Probes

Image Part Number Description / PDF Quantity Rfq
CT2840RA

CT2840RA

Cal Test Electronics

OSCOPE PROBE X10 250MHZ 10M

7
CT4079-NA

CT4079-NA

Cal Test Electronics

OSCOPE PROBE X200/X2K 50MHZ 40M

2
CT3684

CT3684

Cal Test Electronics

OSCOPE PROBE X10 50MHZ 1.6M

5
PP006D

PP006D

Teledyne LeCroy

OSCOPE PROBE 10:1 500MHZ 10M

7
CT4024

CT4024

Cal Test Electronics

OSCOPE PROBE X1K 40MHZ 100M

12
GE3425

GE3425

Cal Test Electronics

OSCOPE PROBE X100 100MHZ 100M

0
GE1511RA

GE1511RA

Cal Test Electronics

OSCOPE PROBE X10 150MHZ 10M

6
CT3290RA-PRO

CT3290RA-PRO

Cal Test Electronics

OSCOPE PROBE X10 500MHZ 10M

8
GE2511

GE2511

Cal Test Electronics

OSCOPE PROBE X10 250MHZ 10M

10
DPB5700

DPB5700

Siglent Technologies

PROBE HV DIFFERENTIAL 70MHZ 2%

0
CT3685

CT3685

Cal Test Electronics

OSCOPE PROBE X100 50MHZ 4M

0
6497

6497

Pomona Electronics

OSCOPE PRB X10 350MHZ/350MHZ 10M

4
CT4066

CT4066

Cal Test Electronics

OSCOPE PRB X20/X50/X200 25MHZ 4M

2
CT4206

CT4206

Cal Test Electronics

OPROBE 1.5GHZ 100X 50O 1.3M 2.5M

13
VPS510-B

VPS510-B

Fluke Electronics

OSCOPE PROBE X10 500MHZ

1
GE2501

GE2501

Cal Test Electronics

OSCOPE PROBE X1 55MHZ 1M

2
VPS41

VPS41

Fluke Electronics

OSCOPE PROBE 40MHZ

0
P250BR2

P250BR2

TPI (Test Products International)

OSCOPE PROBE X10 250MHZ 10M

65
HVD3106

HVD3106

Teledyne LeCroy

120MHZ HV DIFF PROBE

5
4823

4823

Introspect Technology

OSCOPE PROBE X1 5GHZ 1K

14

Test Leads - Oscilloscope Probes

1. Overview

Oscilloscope probes and test leads are critical interface components between electronic circuits under test and measurement instruments. They ensure accurate signal transmission while minimizing circuit loading effects. These probes convert physical electrical signals into measurable waveforms, enabling engineers to analyze voltage, current, timing, and signal integrity in real time. Their importance in modern electronics spans from R&D validation to field service diagnostics.

2. Main Types and Functional Classification

TypeFunctional CharacteristicsApplication Examples
Passive Voltage ProbesHigh impedance (10M ), 1:1 or 10:1 attenuation, no power requiredBasic circuit troubleshooting, education labs
Active Voltage ProbesPowered design, 50k impedance, 1:1 attenuation, high bandwidth (>1GHz)High-speed digital circuits, RF testing
Current ProbesNon-invasive measurement via Hall effect or current transformerSwitching power supplies, motor drives
Differential ProbesMeasure voltage between two points, reject common-mode noiseHigh-voltage floating measurements, balanced circuits
Logic ProbesDigital signal detection with threshold indicatorsDigital circuit debugging, embedded systems

3. Structure and Components

Typical probe construction includes: - Probe tip (spring-loaded or solderable contact) - Ground lead (short/adjustable length) - Coaxial cable (50 or 75 shielded) - Compensation network (variable capacitor for frequency response adjustment) - BNC/SMA interface (50 matched connector) - Attenuation switch (for 1x/10x selection) - Probe head (ergonomic design with overvoltage protection)

4. Key Technical Specifications

ParameterDescriptionImportance
BandwidthFrequency range (-3dB point)Determines signal fidelity for high-speed transitions
Input ImpedanceResistance and capacitance presented to DUTAffects circuit loading (typically 10M //15pF)
Attenuation RatioSignal scaling factor (e.g., 10:1)Extends measurement range while maintaining impedance
Rise TimeFastest measurable edge (10-90%)Essential for digital signal analysis
Parasitic CapacitanceTip capacitance (<1pF for active probes)Impacts high-frequency measurement accuracy
CMRRCommon-mode rejection ratioCritical for differential signal integrity

5. Application Areas

  • Electronics Manufacturing (PCB testing, component validation)
  • Automotive Electronics (ECU analysis, CAN bus troubleshooting)
  • Telecommunications (5G signal analysis, fiber optic transceivers)
  • Medical Equipment (ECG machine diagnostics, imaging system validation)
  • Education & Research (University labs, prototype development)

6. Leading Manufacturers & Products

ManufacturerRepresentative ProductKey Specifications
TektronixP6139B500MHz, 10:1 passive probe, 10M impedance
KeysightN2790A2GHz active differential probe, 50k input
Flukei410scAC/DC current probe, 1500A range, 100kHz bandwidth
Rohde & SchwarzRTH-HDO441GHz bandwidth, 4-channel logic probe
SiglentSP2020200MHz passive probe, 10M , 10:1 attenuation

7. Selection Guidelines

Key considerations include: - Bandwidth matching (3-5 signal frequency) - Impedance compatibility (10M for general use, 50 for high-speed) - Signal type (voltage/current/differential) - Environmental factors (temperature, vibration) - Safety ratings (CAT II/III for industrial environments) - Cost vs. performance trade-offs

8. Industry Trends

Current trends include: - Development of 10GHz+ bandwidth active probes - Integration with AI-based signal integrity analysis - Wireless probe systems for hazardous environments - Enhanced EMI shielding for 5G/mmWave testing - Standardization of probe calibration procedures (ISO/IEC 17025) - Miniaturization for high-density PCB measurements

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