How to Calibrate Smart Tweezers for Voltage Measurements?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

You have to calibrate Smart Tweezers if measured values for two different polarities differ more than 1%. For instance, you measured values 1.39V for one polarity and -1.51V when you change polarity to the opposite. After calibration Smart Tweezers have to show equal values for both measurements. For calibration you have to do the following:

  1. Select MEASURE->VOLTAGE
  2. Connect the probes to each other and select MEASURE->VOLTAGE->CALIBR
  3. As soon as you see DONE on the screen, you have to select AUTOSET->EXIT and disconnect the probes.

How to Extract Parasitic Probe Capacitance of Smart Tweezers?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

The parasitic probe capacitance depends on the distance between the tips, that is it will be different for different measured component sizes.  To obtain the value of capacitance of the Smart Tweezers probes, you have to do the following:

  1. Select mode for capacitance measurements by setting MEASURE->MODE->CAP. Letter ‘C’ will indicate that you selected capacitance measurement mode.
  2. Select measurement frequency 10 KHZ by setting MEASURE->FREQ->10KHZ
  3. When you squeeze the probes until the size of the gap is equal to the size of component which you are going to measure, the parasitic capacitance value will be displayed on the screen. This is the value that you have to subtract from any measured capacitance of the same size. Typical parasitic probe capacitance is about 1.5 pF.

Is Smart Tweezers Design Patented?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

The patent is in force in Europe, USA, Canada, Japan, China, Taiwan, Hong Kong, and India.

What Does it Mean That Smart Tweezers are ‘Factory Pre-Calibrated’?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

Smart Tweezers do not require any calibration. Every single Smart Tweezers is calibrated upon assembly at the factory using a special calibration stand. This stand is annually certified by JOLA Instruments Inc. and the calibration certificate is NIST and NRC traceable.

I Prefer to Hold the Tweezers in My Left Hand. Is Smart Tweezers Only for the Right Hand?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

You can adjust Smart Tweezers for left hand use. Switch mode SYSTEM and choose LEFT.

Smart Tweezers Automatically Turn Off too Quickly. Some Times it Hinders Me from My Work.

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

The turn-off time can be user selected in SYSTEM-> DISPLAY -> TIME-OUT

What Happens if the Measured Voltage Exceeds 8V Limit?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

The Smart Tweezers design provides protection if the voltage exceeds 8V limit. The maximum allowable voltage is 24 V.

Can Smart Tweezers Measure Current?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

By measuring a voltage drop across a resistor Vr (resistor value R can be also measured using ST) the current through the resistor is easily calculated Ir=Vr/R.

The Batteries Discharge Very Quickly, What Was Done Wrong?

// November 12th, 2012 // No Comments » // Uncategorized

There are two typical mistakes leading to a quick discharge of batteries:

  1. the Toggle switch at the bottom left corner of the Smart Tweezers unit is returned to the default position after voltage measurement is done; and
  2. the Test Frequency is set to 10 KHZ. In the latter case, Smart Tweezers do not turn off automatically due to parasitic capacitance of the tweezers’ tips leading to a current flowing through it. Change the Test Frequency to ‘Auto’ after measuring something at high frequency

Can Smart Tweezers be Used on a PCB Circuit?

// November 12th, 2012 // No Comments » // Smart Tweezers Questions and Answers

Yes, if you know the circuit and understand how it works. It can also be used for voltage measurements in a working circuit to debug it. By measuring a voltage drop on a resistor (that can be also measured using ST) the current through the resistor is easily calculated.