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Test Leads - Oscilloscope Probes

Image Part Number Description / PDF Quantity Rfq
CT3743

CT3743

Cal Test Electronics

OSCOPE PROBE X10 100MHZ

3
PP024-1

PP024-1

Teledyne LeCroy

OSCOPE PROBE X10 500MHZ 10M

0
PB925

PB925

Siglent Technologies

PROBE KIT OSCILLOSCOPE 250MHZ

0
CT3288ARA

CT3288ARA

Cal Test Electronics

OSCOPE PROBE X10 500MHZ 10M

11
CT4192

CT4192

Cal Test Electronics

OSCOPE PROBE X10/X100 70MHZ 4M

8
CT3290RA

CT3290RA

Cal Test Electronics

OSCOPE PROBE X10 500MHZ 10M

0
CT3277SA

CT3277SA

Cal Test Electronics

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

6
VPS212-G

VPS212-G

Fluke Electronics

OSCOPE PROBE X10 200MHZ 10M

2
GE1521

GE1521

Cal Test Electronics

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

16
GE1511

GE1511

Cal Test Electronics

OSCOPE PROBE X10 150MHZ 10M

19
T3DSO1000-LS

T3DSO1000-LS

Teledyne LeCroy

MSO LOGIC PROBE LEAD SET 16CH 50

3
IP250

IP250

TPI (Test Products International)

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

5112
CT4025

CT4025

Cal Test Electronics

OSCOPE PROBE X100 120MHZ 100M

7
DL05-HCM

DL05-HCM

Teledyne LeCroy

500 MHZ 60 V COMMON MODE DIFFERE

0
ADF25A

ADF25A

TPI (Test Products International)

OSCOPE PRB X10/X100 25MHZ 4M/8M

1717
DPB5150

DPB5150

Siglent Technologies

PROBE HV DIFFERENTIAL 70MHZ 2%

1
CT4072

CT4072

Cal Test Electronics

OSCOPE P X100/200/500/1K 100MHZ

27
PP018-1

PP018-1

Teledyne LeCroy

OSCOPE PROBE X10 500MHZ 10M

10
CT3288RA

CT3288RA

Cal Test Electronics

OSCOPE PROBE X10 500MHZ 10M

12
HVFO-6M-FIBER

HVFO-6M-FIBER

Teledyne LeCroy

OSCOPE PROBE 60MHZ

0

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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