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Test Leads - Oscilloscope Probes

Image Part Number Description / PDF Quantity Rfq
PPE4KV

PPE4KV

Teledyne LeCroy

OSCOPE PROBE X100 400MHZ 50M

7
CT4204

CT4204

Cal Test Electronics

OPROBE 1.5GHZ 10X 50O 1.3M 2.5MM

5
GE2511RA

GE2511RA

Cal Test Electronics

OSCOPE PROBE X10 250MHZ 10M

9
SP2030A-1

SP2030A-1

Siglent Technologies

OSCILLOSCOPE PROBE- 350 MHZ AUTO

0
CT4196

CT4196

Cal Test Electronics

DIFFERENTIAL PROBE KIT, 60 MHZ,

1
HVP120

HVP120

Teledyne LeCroy

OSCOPE PROBE X100 400MHZ

6
ZD1500

ZD1500

Teledyne LeCroy

OSCOPE PROBE X10 1.5GHZ 1M

0
CT3133RA

CT3133RA

Cal Test Electronics

OSCOPE PROBE X10 350MHZ 10M

16
SP100B

SP100B

TPI (Test Products International)

OSCOPE PRB X1/X10 100MHZ 1M/10M

112
VPS510-G

VPS510-G

Fluke Electronics

OSCOPE PROBE X10 500MHZ

0
GSA-3743

GSA-3743

Global Specialties

OSCOPE PROBE X1/X10 100MHZ 10M

0
GE3121

GE3121

Cal Test Electronics

OSCOPE PROBE X100 150MHZ 100M

6
PB830

PB830

Siglent Technologies

OSCILLOSCOPE PROBE- 300 MHZ 400V

1
CT4121

CT4121

Cal Test Electronics

OSCOPE PROBE X10 1.2GHZ 1M

3
ZD500

ZD500

Teledyne LeCroy

OSCOPE PROBE X10 500MHZ 1M

2
CT4207

CT4207

Cal Test Electronics

OPROBE 700MHZ 10X 1MO 1.3M 2.5MM

12
SP250B

SP250B

TPI (Test Products International)

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

7130
SP300B

SP300B

TPI (Test Products International)

OSCOPE PRB X1/X10 300MHZ 1M/10M

15232
CT2676A

CT2676A

Cal Test Electronics

OSCOPE PROBE X10 100MHZ 10M

8
CT2703

CT2703

Cal Test Electronics

OSCOPE PROBE X1/X10 60MHZ 1M/10M

28

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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