New Model of Digital LCR Meter - SMT Smart Tweezers ST-5
Released October 2011
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| New Model ST-5-AS with USB Charger | Older Model ST-R with Inductive Charger |
The main difference between the old and the new model of Smart Tweezers is a 4-wire connection (Kelvin probe) brought up to the gold-plated tweezers tips.
This significantly reduces noise and therefore improves accuracy at least 6 times.
The new model also features charging via installed USB port. In contrast to the previous model using NiMH battery, Li-Ion battery is used increasing the battery life considerably.
Features introduced in the new model are: Automatic Offset Subtraction, Component Sorting and Designated ESR Measurement.
Eliminated features are: DC and AC Voltage measurements.
The Model ST-AS with not rechargeable batteries was discontinued due to the shortage of suppliers of few key components. We had to re-engineer the SMT Smart Tweezers to cope with the long term supply of the key components.
Now we have a much better (six time more accurate) LCR Meter than ever before.
It is the Model ST-5-AS rechargeable via USB port.
Table below summarizes the differences between the new ST-5-AS model and an old model ST-AS.
Comparison of the ST-AS and New Model ST-5-AS of Smart Tweezers
(Differences marked in Blue)
| Old ST-AS Model | New Model ST-5 | |
|---|---|---|
| Feature | ||
| Automatic LCR Measurement | Yes | Yes |
| Manual LCR Measurement | Yes | Yes |
| Diode Test | Yes | Yes |
| Continuity Test | Yes | Yes |
| DC Voltage Measurement | Yes | No |
| AC Voltage Measurement/ Trace Mode | Yes | No |
| Rechargeable Batteries / Charger | Optional | Standard |
| Designated ESR Measurement | No | Yes |
| Automatic Offset Subtraction | No | Yes |
| Component Sorting | No | Yes |
| Technical Specs | ||
| Test Frequency | 0.1, 0.12, 1, 10 kHz +/- 0.25% | 0.1, 0.12, 1, 10 kHz +/- 0.25% |
| Test Signal Level | 0.32 +/- 10% Vrms | 0.32 +/- 10% Vrms |
| Source Impedance | 620 Ohms +/- 5% | 620 Ohms +/- 5% |
| Typical Accuracy | ||
| Resistance | 1% | 0.20% |
| Capacitance | 3% | 0.50% |
| Inductance | 3% | 0.50% |
| Measurement Range | ||
| Resistance | 0.1 Ohm to 10 Mohms | 0.1 Ohm to 10 Mohms |
| Capacitance | 0.5 pF to 5 mF | 0.5 pF to 1 mF |
| Inductance | 0.5 uH to 1 H | 0.5 uH to 1 H |
Please see here complete manual of the ST-5-AS SMT Smart Tweezers