PLJ-8LED is a cost-effective frequency display component with an eight-digit digital tube display, which is mainly used for the display of frequency values of transceivers and other equipment, and can also be used for conventional frequency measurement. This component is characterized by small and exquisite, reliable performance, good visual effect and low cost.

Main features:

⊙ 2.4 GHz frequency meter with Microchip's PIC16F648A as the core.

⊙ The frequency reference adopts a temperature-compensated voltage-controlled crystal oscillator (2.5 ppm VC-TCXO).

A unique gate control method and precise timing algorithm (non-timed interrupt method) are used.

Gate (display refresh) time 0.01 sec/0.1 sec/1.0 sec selectable, real-time display of frequency value.

Single-ended input design, frequency measurement three channels (low channel/high channel/auto channel) optional.

Dual IF design, IF value and add/subtract mode can be preset individually.

Adopt eight 0.56-inch high-brightness digital tube display, eight levels of adjustable brightness.

Invalid zero automatic blanking, invalid frequency value display filtering optional, the last blanking optional.

Simple circuit, reasonable structure, double button control, simple operation.

The settings are saved automatically and can be called up directly after power on.

Technical Parameters
1. Gate time

⊙ 0.01 sec

⊙0.10sec

⊙1.0sec

2. Measurement channels (high and low channels are high resistance)

⊙ Low channel

Measurement range: 0.1 MHz ~ 60 MHz

Measurement accuracy: ± 100 Hz (at 0.01 sec gate)

±10Hz (at 0.1 sec. gate)

±1Hz ( 1.0 second gate)

Low channel sensitivity:

0.1 MHz ~ 10 MHz: better than 60 mVPP

10 MHz ~ 60 MHz: better than 60mVPP

60 MHz ~ 75 MHz: not tested

⊙ High channel (64 divisions)

Measurement range: 20 MHz ~ 2.4 GHz

Measurement accuracy: ±6400Hz (at 0.01 sec gate)

±640Hz ( 0.1 sec gate)

±64Hz ( 1.0 sec gate time)

High channel sensitivity:

20 MHz ~ 30 MHz: better than 100mVPP

30 MHz ~ 60 MHz: better than 50mVPP

60 MHz ~ 2.4 GHz: not tested

⊙ Auto Channel

Automatically select the high channel or low channel according to the input signal frequency, the recognized frequency is 60 MHz, if the input signal amplitude greater than 60 MHz is insufficient to automatically select the high channel, you should manually select the high channel to measure the frequency.

3.IF Setting

Independent dual IF design, the minimum step of IF adjustment is 100 Hz, IF range 0 ~ 99.9999 MHz, can be set to add IF or subtract IF mode.

4.Frequency Reference

Adopt 5032 package 13.000MHz temperature complementary voltage controlled crystal oscillator (VC-TCXO), frequency stability is ±2.5 ppm.

5.Operating Voltage

DC input: DC 9V~15V (with power reverse polarity protection)

6.Working Current

Maximum 160 mA (test conditions: ① DC12V power supply; ② red digital tube; ③ eight levels of brightness)

7.Display digits

Eight LED display, the highest display eight digits.

8.Display Brightness

Eight levels of LED brightness adjustable, factory setting for the highest brightness.

9.Physical dimensions

L × W × H: 125.5 mm × 25.5 mm × 21.5 mm

10.Component mass

46 g (net weight)

11.Onboard Interface

DC IN (power connector): HX2.54-2P socket

RF IN (signal input): HX2.54-2P socket

ICSP (Programming Interface): 2.54-6P socket