ED0602 Digital Millisecond Stopwatch

Product Description

The ED0602 digital millisecond timer is a high-precision, 6-digit precision timing and frequency measurement instrument developed by Wuhan Xinhuafu Electric Equipment Co., Ltd. The instrument features innovative design and exquisite craftsmanship, utilizing international standard integrated circuits for its main components. Thanks to the high-precision temperature-compensated quartz crystal oscillator as the measurement standard, the instrument boasts superior measurement accuracy and range compared to general digital electric stopwatches. For convenience in measurement, the instrument is equipped with an automatic reset circuit (when in "dual-channel" measurement, the previous test digits are cleared upon the next measurement signal input). The structure uses an ABS engineering plastic portable case, and the circuit board features a large board structure with printed characters for easy inspection and maintenance. The panel switch layout is well-organized, aesthetically pleasing, and the operation instructions are clear and straightforward.

The ED0602 digital millisecond timer boasts excellent stability, strong anti-interference capabilities, high testing accuracy, ease of operation, intuitive readings, lightweight design, attractive appearance, and high performance-to-price ratio. It is widely used for time parameters in electronic circuits and testing of various precision relays, time-delay relays, and timers. It is the ideal precise timing instrument for metrological inspection departments, industrial automation control, communication, signaling, relay manufacturing, power relay protection, national defense, and scientific research systems.

 

Product Features

Test Function:

1. Positive pulse width.
2. Negative polarity pulse width.
3. Dead-time for the air gap closure.
4. Breakaway time of air terminal
5. Frequency Measurement
6. Double Road Interval Time
Start Timing — Positive Transition, Negative Transition, Open Contact (Open Node)
Stop Timer — Positive and Negative Transitions, Open Contact (Open Node)
 
Principle Overview:

The basic testing principle of the ED0602 digital millisecond timer is: the measured signal is attenuated, limited, amplified, and shaped through the input channel to control the opening and closing of the main gate. Within the measured time, the counter counts the internal time standard, thereby displaying the measured time value.
  
Use Instructions:

1. When testing electrical signals, the amplitude must be within the range of 5-50V (P-P). Connect the red clip of the test cable to the signal terminal being measured, and the black clip to the ground terminal (zero potential) of the signal. During frequency measurement, the signal peak should be ≤50V.
2. When testing the open circuit signal, there must be no voltage present at the two ends of the tested contact. The black and red clips of the test cable can be arbitrarily clamped at either end of the tested contact.
3. The signal to be tested must be a single event.
4. During dual-channel testing, the "open contact" position is active whether the contacts are closed or open; identification is not required.
5. During dual-channel testing, the next test signal input can automatically reset, but it can also be manually reset by the operator.
6. When testing the relay's operating time, it is not advisable to use a parallel test clip on the relay coil as the power signal to start the meter (due to inductance). Instead, a synchronous double-pole switch with an open contact should be used to start the meter. Otherwise, it may cause interference or damage the instrument.
 
Usage Instructions:

When measuring time: Select an appropriate time scale (range) based on the range.
1. Positive pulse width test
Set the function selection switch (K1) to the "Positive Pulse Width" position, and the signal to be measured can be input from the "A" socket for measurement. (The test electrical pulse must be a single signal; continuous electrical pulses will be accumulated.)
2. Negative polarity pulse width test
Place the function selection switch (K1) on the "Negative Pulse Width" position, and the signal to be measured can be input from the (A) socket for measurement. (The test electrical pulse must be a single signal; continuous pulses will accumulate.)
3. Open Contact Closure Time Test
Set the function selection switch (K1) to the "Empty Contact Closed" position, then test by clamping the red and black clamps of the cable at both ends of the test contact, and the test signal can be input from the (A) socket for testing.
4. Air gap disconnection time measurement
Set the function selection switch (K1) to the "Open Contact Break" position, then test by connecting the red and black clips of the cable to the ends of the test contact points. The test signal can be input from the (A) socket for testing.
5. Dual-path Time Interval Test
The ED0602 digital millisecond timer allows "start" and "stop" signals to be either "positive jump," "negative jump," or "no node," with a total of nine combination testing methods.
The ED0602 digital millisecond timer selects the function switch (K1) position based on the "start" signal and the function switch (K2) position based on the "stop" signal. Connect the "start" signal to the "A" socket and the "stop" signal to the "B" socket for testing.

Technical Specifications

1. Measurement Range: 0.01ms - 9999.99 S
2. Time accuracy: ≤5×10^-6.
3. Measurement Error: ≤5×10^-6 ± 1 decimal place.
4. Display Method: Six-digit red LED digital tube.
5. Signal Compatibility: Positive and negative pulse waves, positive and negative potential jumps, contact closure and disconnection (no-contact node). Signal Amplitude Compatibility: 5V-50V (P-P)
6. Frequency Measurement Signal: 5V-50V (P-P) square wave, sine wave.
7. Input Impedance: 50KΩ at measurement time, 10KΩ at frequency measurement.
8. Work Environment:
Temperature: 0-40℃
Temperature: ≤85% (30°C).
9. Operating Voltage: 220±10% 50/60Hz.
10. Power Consumption ≤ 6W.
11. Continuous Working Time: 8h
12. Specifications: 264 (Length) x 360 (Width) x 85 (Height) mm.
13. Weight: Approximately 2kg.
14. Reset Method: Manual or Automatic (Dual-path).

Complete set of equipment