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Smart Tweezers ST5-S User Manual

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June 18, 2025

how to reset smart tweezer st 5s

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Summary of Contents for Smart Tweezers ST5-S

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Notice Warranty Safety Precautions Getting Started Overview How it works Controls Power On Display Displayed Parameters Menu Structures And Functions Measurement menu Setting Menu Measurement Features Maintenance Appendix B. Default Settings...

  • Page 3: Notice

    NOTICE: TO THE BEST OF OUR KNOWLEDGE THIS DOCUMENT IS BELIEVED TO BE ACCURATE. THE MANUFACTURER RESERVES THE RIGHT TO CHANGE THE INFORMATION AND DOES NOT ASSUME ANY RESPONSIBILITY FOR OMISSIONS AND/OR ERRORS FOUND IN THIS DOCUMENT. WARRANTY: MANUFACTURER WARRANTS THIS PRODUCT TO BE FREE FROM DEFECTS IN MATERIALS AND WORKMANSHIP FOR A PERIOD OF ONE (1) YEAR FROM THE SHIPMENT DATE.
  • Page 4 • Do not attempt to measure any components in- circuit when your circuit is alive or active. To avoid possible damage to Smart Tweezers or to the • Disconnect circuit power supply and discharge all high-voltage capacitors before testing resistance, inductance, or capacitance.

  • Page 5: Overview

    The device has a unique mechanical design that allows manipulation SMT components with size down to 0201. In actual use Smart Tweezers provides more accurate results than most of the benchtop LCR meters due to small and very predictable parasitics of its probes.
  • Page 6 ST evaluates impedance of a component by measuring the voltage across the component and current through it. The complex ratio of voltage to current is equal to the complex impedance. The unit’s processor calculates various parameters that are displayed i.e. R, C or L. VOLTAGE SIGNAL TO ADC CURRENT SIGNAL...

  • Page 7: Controls

    The Navigation Control The navigation switch is used to select a function or to change a setting of Smart Tweezers. The navigation switch can be moved (rocked) in 4 directions (UP, DOWN, LEFT, RIGHT). Selection is performed by pressing along the vertical axis (PRESS).
  • Page 8 – change test ranges DOWN – change test signal levels LEFT/ – change measurement modes To turn the Smart Tweezers ON, press the navigation switch twice. Note: Once powered on, the unit will perform the last selected function. - ST powers off automatically if neither a measurement is performed nor the navigation control is operated for approximately 30 seconds (default value).

  • Page 9: Displayed Parameters

    The Primary Display is located in the middle of the screen and uses the largest font. It shows the dominant impedance parameter reading typically with 5 digits displayed. The Secondary Display is located just above the Primary Display. It shows the minor impedance parameter reading. The Test Parameters area is at the top of the screen and provides information about current test conditions such as Test Frequency, Range, Test Signal level, Test Model.
  • Page 10 • For C >= 500 pF Serial circuit diagram (Rs) is used. This section describes menu structure and device parameters setting. Smart Tweezers menu system contains • Main menu — main menu items • System menu — system menu items •...

  • Page 11: Measurement Menu

    • Service menu — service functions • Measurement menu – measurement functions and settings • Mode menu – measurement modes • Setting menu – measurement parameters settings Move the Navigation Control UP or DOWN to move cursor to the desired menu item and PRESS it to select the item. The Current Setting cursor indicates the current setting.
  • Page 12 System menu is used to access system settings and functions. Sound menu is used to change the sound setting Select ON Select OFF to disable sound for all functions except for the Navigation Control operation. Select R-TONE to enable a special mode when beep frequency varies depending on the measured resistance value in the Resistance Mode (see the Measurement Menu section).
  • Page 13 The mode could be used for locating shorted part of a circuit e.g. on a PCB. Display menu is used to change display’s settings • Select RIGHT to set the “Right Handed” display mode • Select LEFT to set the “Left Handed” display mode Select CONTR to adjust display contrast.
  • Page 14 Select BATTERY to measure the actual battery voltage. PRESS to exit Select S/N to display the device Serial Number Measurement modes and settings The Mode menu is used to set the measurement mode. Select RES, IND, CAP, IMP or ESR menu items to measure desirable component or parameter as Resistance, Inductance, Capacitance, Impedance and ESR accordingly.

  • Page 15: Measurement Features

    Select AUTO mode (AM sign appears at the left bottom corner of display) for automatic measurement of inductance, capacitance or resistance. Note: In the AUTO mode ST uses 1kHz test frequency by default and has a limited sensitivity. Automatic detection may not work for small value capacitors and inductors.
  • Page 16 Use this menu to set desired test frequency. Use this menu to set secondary display parameter. The following combinations are allowed: • C+R capacitance + resistance • C+D capacitance + dissipation factor • L+R inductance + resistances • L+Q inductance + quality factor...
  • Page 17 Use this menu to set desirable test signal level. Default value is 0.5 Vrms. 1.0 Vrms is equal to 2.8 Vp-p Any non-ideal component can be represented as a resistive component in series or in parallel with a reactive component. Depending upon the characteristics of the component the series or parallel model will be more accurate.
  • Page 18 • Connect to an appropriate component selected as a reference value • Enter the TOLERance menu and select desired tolerance range Smart Tweezers will display difference in percent from the reference value and the beeper will beep • 1 time when the component is within the setting tolerance.
  • Page 19 To store an offset • Select manual L, C or R measurement mode (see MODE menu) • Enable the HOLD mode (see HOLD menu) • Obtain offset value by measuring a component or by nulling test leads (see examples below) •...
  • Page 20 To reset (set to zero) the stored offset for a particular test mode • Select manual L, C or R measurement mode (see MODE menu) • Enable the HOLD mode (see HOLD menu) • Enter the NULL menu and select ZERO To reset the NULL mode completely select AUTOSET from the main menu or DEFAULT from the SETTINGS menu.
  • Page 21 Measuring resistance Covers resistance measurements. Measuring capacitance Covers capacitance measurements. Measuring inductance Covers inductance measurements. Testing diodes Describes testing general-purpose diodes. There is some small resistance offset due to the resistance of the tweezer tips, and resistance of the contacts between the increase if the gold on the tweezer tips wears out.The offset value should be used in calculation of the actual resistance.
  • Page 22 10 kHz <10000pF 1 kHz There is some small capacitance offset due to capacitance of the tips. The offset depends on the distance between the tips (i.e. measured component size). The offset value should be used in calculation of the actual capacitance. Table below shows typical offset values for different component sizes: Component size 0.58...
  • Page 23 Use the ESR measurement to measure the equivalent series resistance of a capacitor independent of its capacitance. Test frequency 0.1kHz/1 kHz/10kHz/120Hz Test signal amplitude 0.5/1.0Vrms Sine wave Source impedance Test period 1 Sec (default) Equivalent circuit diagram Serial All circuit components, resistors, capacitors, and inductors have parasitic components.
  • Page 24 3. Reset device by reconnecting battery (requires top lid and the circuit board removal). : Smart Tweezers repairs should only be performed by This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1.
  • Page 25 AC test mode Test 1 kHz, 10 kHz, 120Hz,100 Hz frequency: Test frequency accuracy: 50 PPM (0.005%) Test signal level: 0.5/1.0 +/- 5% Vrms Sine wave Source impedance: Resistance Capacitance 0.65 pF Inductance 100 uH Offset value should be subtracted from measurement result for Parameter Measurement Range Test frequency...
  • Page 26 Resistance R: Capacitance C: Inductance L: 0.5 uH to 999 mH Quality factor Q: 0.001 to 1000 * Dissipation factor D: 0.001 to 1000 * Capacitance C: 0.1 pF Inductance L: Quality factor Q: 0.001 Dissipation factor D: 0.001 Phase angle F: 0.1 deg * indication of the parameter not implemented in some versions Dominant parameter...
  • Page 27 SOUND mode: DISPAY mode: No change Contrast: No change Readings PERIOD: 1 sec Measurement mode: AUTO Test frequency mode: AUTO Offset CALIBRATION: No change Range Resolution 100 Hz 1 kHz 10kHz 0.7% + 50 0.7% + 50 0.7% + 50 0.7% + 8 0.7% + 8 0.7% + 8...
  • Page 28 Range Resolution100 Hz 120 Hz 1 kHz 10 kHz 1000 µF 0.1 µF 0.5% + 5 0.5% + 5 100 µF 0.01 µF 0.3% + 3 0.5% + 5 10 µF 0.001 µF 0.2% + 3 0.2% + 3 1 µF 0.1 nF 0.2% + 3 0.2% + 3...