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Test Leads - Oscilloscope Probes

Image Part Number Description / PDF Quantity Rfq
RP4030

RP4030

Teledyne LeCroy

OSCOPE PROBE X1.2 4000MHZ 50K

2
GE1521SA

GE1521SA

Cal Test Electronics

OSCOPE PRB X1/X10 150MHZ 1M/10M

3
PB01-A001

PB01-A001

CIT (Carlisle Interconnect Technologies)

PROBE ASSY,1X&10X 250MHZ,CATII

47
T3PP300

T3PP300

Teledyne LeCroy

PASSIVE PROBE 300 MHZ 1X/10X 1MO

12
GE2521SA

GE2521SA

Cal Test Electronics

OSCOPE PRB X1/X10 250MHZ 1M/10M

0
PR250B

PR250B

B&K Precision

OSCOPE PROBE X10 250MHZ

6
CT4068-NA

CT4068-NA

Cal Test Electronics

OSCOPE PROBE X10/X100 35MHZ 9M

6
6498

6498

Pomona Electronics

OSCOPE PROBE X100 400/500MHZ 50M

15
GE4511RA

GE4511RA

Cal Test Electronics

OSCOPE PROBE X10 500MHZ 10M

7
PR2000B

PR2000B

B&K Precision

OSCOPE PROBE X100 200MHZ 100M

15
6496

6496

Pomona Electronics

OSCOPE PRB X10 350MHZ/350MHZ 10M

0
VPS410-II-B

VPS410-II-B

Fluke Electronics

OSCOPE PROBE X10 500MHZ 10M

0
PR250SA

PR250SA

B&K Precision

OSCOPE PROBE X10 250MHZ

0
PR150SA

PR150SA

B&K Precision

OSCOPE PROBE X10 150MHZ

0
CT2674A

CT2674A

Cal Test Electronics

OSCOPE PROBE X1/X10 100MHZ 10M

45
CT2840

CT2840

Cal Test Electronics

OSCOPE PROBE X10 250MHZ 10M

7
CT3688A

CT3688A

Cal Test Electronics

OSCOPE PROBE X10 200MHZ 500K

0
LP2560

LP2560

B&K Precision

OSCOPE PROBE 60MHZ 100K

1
GE3421

GE3421

Cal Test Electronics

OSCOPE PROBE X100 100MHZ 100M

4
PR500B

PR500B

B&K Precision

OSCOPE PROBE X10 500MHZ

17

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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