ขายเครื่องนับความถี่แบบเปลือย ราคาถูก 650 บาท พร้อมส่ง EMS
ราคาประหยัดสำหรับ นักเรียน นักทดลอง ครับ
With Microchip's PIC16F648A, 2.4 GHz frequency meter.
Using temperature-compensated voltage controlled crystal oscillator (2.5 ppm VC-TCXO).
Unique gate control and precise time algorithm (non-timed interrupt).
Gate (display refresh) time 0.01 seconds / 0.1 seconds / 1.0 seconds, real-time display frequency value.
Single-ended input design, three-channel frequency measurement (low channel / high channel / Auto Channel).
Dual frequency design, value and IF / down mode can be preset separately.
Using eight 0.56 inches high brightness digital display, eight adjustable brightness.
Circuit is simple and reasonable structure, two-button control, simple operation.
The settings are automatically saved, boot directly call.
Descriptions:
1 Gate time
0.01
0.10
1.0
2 Measurement channels (channels are low impedance)
low channel
Measuring range: 0.1 MHz ~ 60 MHz
Accuracy: ± 100Hz (0.01 1s gate time)
± 10Hz (0.1 seconds gate)
± 1Hz (1.0 seconds when the gate)
Low channel sensitivity:
0.1 MHz ~ 10 MHz: better than 60mVPP
10 MHz ~ 60 MHz: better than 60mVPP
60 MHz ~ 75 MHz: Not tested
high channel (divided by 64)
Measuring range: 20 MHz ~ 2.4 GHz
Accuracy: ± 6400Hz (0.01 seconds gate)
± 640Hz (0.1 1s gate time)
± 64Hz (1.0 1s gate time)
High channel sensitivity:
20 MHz ~ 30 MHz: better than 100mVPP
30 MHz ~ 60 MHz: better than 50mVPP
60 MHz ~ 2.4GHz: not tested
Auto Channel
Automatically selected according to the input signal frequency high or low channel channel, identifying the frequency of 60 MHz. Such as when the input signal amplitude is greater than 60 MHz shortage can not automatically select high channel, the channel should manually select high frequency measurement.
3,IF settings
Independent double-IF design, adjust the minimum frequency step of 100 Hz, frequency range 0 ~ 99.9999 MHz, can be set to increase or decrease the IF frequency mode.
4. Frequency reference
Using 5032 package 13.000MHz Warming voltage controlled crystal oscillator (VC-TCXO), frequency stability of ± 2.5 ppm.
5. Operating voltage
DC Input: DC 9V ~ 15V (with reverse polarity protection)
6 Current
Maximum 160 mA (test conditions: ① DC12V power supply; ② red LED; ③ eight brightness)
7 Eight LED display, the highest display eight digits.
8 Eight LED brightness is adjustable, factory set to maximum brightness.
9 Physical Dimensions,Length × width × height: 125.5 mm × 25.5 mm × 21.5 mm
10. Component quality 46 g (NW)
11. Onboard Interface
DC IN (Power Interface): HX2.54-2P socket
RF IN (signal input): HX2.54-2P socket
ICSP (programming interface): 2.54-6P Pin
Package included :
100% Brand New High Quality
