SB4181 digital phase meterDetailed product description：

The SB4181 digital phase meter uses a microcontroller to control and measure the phase difference between two signals of the same frequency. It has automatic range conversion and can measure sine, triangle, and square wave waveforms. The instrument is simple to operate and easy to use.
This instrument displays both frequency and phase values simultaneously, making it convenient for users to use.
This instrument is suitable for application units such as national defense, scientific research, and teaching that require phase difference detection.

One SB4181 Digital Phase Meter Index
1. Phase measurement range: -180 ° to+180 °
2. Frequency range: 10 Hz to 400 kHz
3. Input signal amplitude: 0.1V~120Vrms
4. Resolution: 0.01 °
5. Reading stability:
10 Hz ～ 100 Hz ±0.5°
100 Hz ～ 100 kHz ±0.1°
100 kHz ～ 400 kHz ±0.5°
6. Phase measurement error:
When the two tested signals are both sine wave signals and the distortion is less than 0.17%, and the effective amplitude of the input signal is 1V in the frequency range of 10 Hz to 50kHz and 3V in the frequency range of 50 kHz to 400 kHz, the phase error at different frequencies is:
10 Hz ～ 20 kHz ± 1 °
20 kHz ～ 50 kHz ± 1.2°
50 kHz ～ 100 kHz ± 2 °
100 kHz ～ 400 kHz ± 2°/100kHz
7. Impact error
a. Temperature additional error: 0.03 °/℃
b. Amplitude phase error:
The variation of 20dB from 10 Hz to 20 kHz shall not exceed ± 1 °.
The variation of 20dB from 20kHz to 100kHz shall not exceed ± 2 °.
The variation of 20dB from 100 kHz to 400 kHz shall not exceed ± 4 °.
8. Input impedance: 1M Ω below 10V, 10k Ω above 10V.
9. Power supply voltage: 220V ± 10%, frequency 50Hz ± 10%
10. Power consumption: 15W
11. Preheating time: 30 minutes
12. Operating environment: Temperature 0-40 ℃, humidity<80% RH
13. Dimensions: Length x Width x Height 250mm x 230mm x 90mm
14. Weight: Approximately 4 kg

II use
The instrument has two input channels. Each channel consists of an input attenuator, input amplifier, and comparator. The signal output by the comparator is filtered by phase detection and sent to the A/D converter, and then processed by the microcontroller before being sent to the LCD display.
Press the "sine/square wave" button to activate the symmetry compensation circuit when the input signal is a sine or triangular wave. Press the 'sine/square wave' button again to switch the instrument to a square wave input state.
Positive phase during measurement indicates that the reference input signal is ahead of the signal input, while negative phase indicates that the signal input is ahead of the reference signal input.
The range of this instrument is ± 180 °, and positive angles greater than 180 ° are represented by negative angles. If 270 ° is displayed as -90 °.

III Attachment
One power cord
Two testing lines
Insurance tube 0.3A one

4、 Measurement error
During measurement, shielded cables of the same material, diameter, and length should be used to connect two signals of the same frequency being measured. Different lengths or types of test cables can affect the accuracy of phase measurement due to varying distributed capacitance. The impact is greater during high-frequency measurements. For example, cables of the same type (approximately 100pF/meter) with a length difference of 1 meter at 100kHz can cause a phase measurement error of 0.2 °.
5、 Testing method
Required equipment: TD1018 synthetic signal generator
The signal is output by TTL and TTL quadrature, with the following frequency and phase:
Frequency 90 ° output -90 ° output 180 ° output
80Hz 90°± 1° -90°± 1° ±180°± 1°
800Hz 90°± 1° -90°± 1° ±180°± 1°
8kHz 90°± 1° -90°± 1° ±180°± 1°
80kHz 90°± 2° -90°± 2° ±180°± 2°