UCE-CT321L Fault Locator & Curve Tracer


SKU: UCE-CT321L Category:
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UCE-CT321L is suitable for today’s electronic circuit boards where Analog and Digital are mixed together.

Using the proven power-off testing method known as the V-I test method, it eliminates the risk of further circuit damage that typically occurs when power is applied.

The device works by applying a current-limited AC signal across two points of a component. The current flow causes a vertical trace deflection, while the applied voltage causes a horizontal deflection. Together they form a unique V-I signature that represents the overall health of the device under test.

The signature of all analog components is a combination of one or more of the four basic signatures: resistance, capacitance, inductance, and semiconductor. Each of these components reacts differently to the applied AC test signal. For this reason, recognizing the four basic signatures on the display is a key to understanding analog signature analysis.

There are three different models of UCE-CT321L. With one hardware configuration for all models, the   UCE-CT321L series is a flexible and capable platform that will grow with your needs over the years. It allows users to upgrade device capabilities as their needs change.

  • Expandable frequency range,
  • Expandable voltage range,
  • Expandable limit resistance range,
  • Database feature with PC software,
  • Short circuit finder,
  • Capacitance meter,
  • Ohmmeter,
  • HDMI output.

All Options can be installed by the customer himself without the need to send the device to a service center or recalibrate it. To add features, simply purchase emailed licenses.

The Lite edition has limited features. Voltage, frequency and limit resistances are limited. Suitable for beginner level users. In this version, connection to the PC program is not possible.

In the Pro edition, there are no voltage, frequency and limit resistance restrictions. Additionally, a database can be created with PC software and tests can be performed from the database.

In the Expert edition, all features on the device are active. Additional features compared to the Pro edition;

  • Short circuit finder,
  • Capacitance meter,
  • Ohmmeter,
  • LCD image can be mirrored to a TV or monitor via HDMI out.
  • The device can read the database file created in the PC software and perform the database test independently from the PC.

The features of the products can be compared in the table below.

Lite Edition Pro Edition Expert Edition
Device Type Curve Tracer Curve Tracer Curve Tracer
Short-circuit finder NA NA Available
Frequency 20Hz, 50Hz, 60Hz, 200Hz, 2000Hz 20Hz ~ 5kHz (31 steps) 20Hz ~ 5kHz (31 steps)
Open circuit Voltage ±3V, ±5V, ±10V, ±15V, ±20V ±0.2V ~ ±20V (24 steps) ±0.2V ~ ±20V (24 steps)
Limit Resistor 100Ω, 1kΩ, 10kΩ 10Ω, 47Ω, 100Ω, 470Ω, 1kΩ, 4.7kΩ, 10kΩ, 47kΩ 10Ω, 47Ω, 100Ω, 470Ω, 1kΩ, 4.7kΩ, 10kΩ, 47kΩ
Internal disk 4GB micro SD 4GB micro SD 4GB micro SD
Database NA Available Available
Database Test NA on PC on PC & Device
Capacitance Meter NA NA Available
Ohmmeter NA NA Available
HDMI out NA NA 480×272 @60Hz
Mouse support Available Available Available


  • Display: 4.3 inch 480 × 272 pixel color LCD with Touch screen
  • Curve Tracer Channels: 2
  • Test signal: Sine
  • PC connection: Type-C USB connector (USB 2.0 HID protocol)
  • Storage: internal 4GB disk (microSD card)
  • HDMI out for TV or Monitor (480 × 272 @60Hz)
  • Mouse support to operate the device easily
  • Power Consumption: 8W
  • Dimensions: 167 x 83 x 31 mm

Package List:

  • UCE-CT321L Curve Tracer Device
  • 2 pcs BNC to 4mm banana cable
  • 2 sets multimeter pen (red and black), and with needle high-voltage cap
  • 2 sets banana extension cable
  • Touch pen
  • USB cable
  • Carrying Case (Optional)
  • 5V 2.6A power supply (EU Type) (Optional)




Additional information

Weight 760 g
Dimensions 23 × 12 × 8 cm

Lite, Pro, Expert


-, High quality IP68 carrying case


-, 5V 2.6A power supply (EU Type)


-, UCE-ENC3-M control assistant

UCE-CT321L Fault Locator & Curve Tracer - Lite - - -

UCE-CT321L Fault Locator & Curve Tracer - Pro - - -

UCE-CT321L Fault Locator & Curve Tracer - Expert - - -




How to update firmware of UCE-CT321L

PC Software:
The program is compatible with Win8, Win10.
Requirement: Framework 4.5 or later

Update History

PC Software:

Released on 2024-03-29
Recent changes;
  • Added OPC (one probe comparison) Mode. With this mode, two boards can be compared by making consecutive measurements using only the CH-A channel.
  • Fixed an error that occurred when loading files in the database.
  • Some optimizations.

Released on 2024-02-16
Recent changes;
  • Improved the Update checking algorithm. The software automatically checks for updates when it first runs.
  • Some optimizations.

Released on 2024-01-22
Recent changes;
  • First Release

Device firmware:

Released on 2024-07-13
Recent changes;
  • Improved the communication algorithm with the control assistant.

Released on 2024-04-08
Recent changes;
  • Improved the OPC mode algorithm.
  • Optimized the comparison algorithm.

Released on 2024-03-29
Recent changes;
  • Added OPC (one probe comparison) Mode. With this mode, two boards can be compared by making consecutive measurements using only the CH-A channel.
  • Some optimizations.

Released on 2024-02-23
Recent changes;
  • Fixed a bug in the short circuit finder algorithm.
  • Some optimizations.

Released on 2024-02-20
Recent changes;
  • Added a “SC Mode” (Short Circuit Mode) button to the short circuit finder menu. When this button is activated, an analog gauge animation simulating the distance to the short circuit point is activated.
  • Improved the zener diode and standard diode detection algorithm. Voltages Vf and Vz are displayed bidirectionally with positive and negative directions.
  • Improved the DC measurement algorithm.
  • Some optimizations.

Released on 2024-01-22
Recent changes;
  • Fixed a bug in the Measurement calibration algorithm.
  • Fixed a bug in the Screen calibration algorithm.
  • Improved the Impedance curve display algorithm.
  • Some optimizations.



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