Features:
Frequency range: 1Hz-50MHz(in fact, it can work up to 78MHz).
Four or five digits resolution(display for example, x.xxx KHz, x.xxx MHz, or xx.xx MHz).
Automatic range switching with different gate times.
Programmable addition or subtraction of the frequency offset.
Input impedance: 1.1M, in parallel with about 10pF.
Input sensitivity: tipcally less than 20mV RMS from 1Hz-100KHz, rising to 35mV at 20MHz and 75mV at 50MHz(150mV at 78MHz).
Current consumption: 50mA with 7 to 9V input.
Optional(configurable) power-saving mode which automatically turns the display off if the frequency didn't change significantly within 15s.
Specifications:
Type: Assembled Tester / DIY Kit(Optional)
Frequency Range: 1Hz-50MHz
Input Impedance: 1.1M, in parallel with about 10pF
Resolution: Max. 1Hz
Current Consumption: 50mA with 7 to 9V Input
Input Socket: BNC
Display: LED Digital Display
PCB Size: 79 * 62mm / 3.1 * 2.44in
Product Weight: 60g / 2.11oz
Package Weight: 61-65g / 2.16-2.28oz
Package List:
1 * Frequency Meter
Bill Of Materials
*Resistors(0.25W, 1%)
8 R1-R8 1k
2 R9, R15 10k
1 R10 100k
1 R11 1M
1 R12 220
1 R13 56k * According to the different batches of C3355, the resistance may change
1 R14 470
*Capacitors
1 C1 470n Polypropylene
1 C2 100p Ceramic
2 C3 C5 100n Polypropylene
1 C4 47u Electrolytic
2 C6, C8 10u Electrolytic
1 C7 6-40p Variable
2 C14, C15 22p Ceramic
*Integrated Circuits
1 U1 PIC16F628A (Programmed) + 18pin IC socket
1 U2 LM1117-5V SMD
*Transistors
1 Q1 C945
1 Q2 J310
1 Q3 C3355
*Diodes
6 D1-D6 1N4148
1 D7 1N5819
*Miscellaneous
1 J1 16Pin SIL Socket & header
1 J2 BNC Socket
1 J3 DC_CZ_ZM DC adapter socket
1 SW1 AN_SW Push button switch
1 SW2 SW2X2 Push button switch
1 X1 Crystal 20MHz
2 SG1-SG2 Red 2digit common cathode 7-segment display
1 SG3 Red 1digit common cathode 7-segment display
1 Main PCB
1 Display PCB
2 Copper Pillar +Screw +Spring Washer
Assembly Diagram:
https://www.dropbox.com/s/0yjnpjtfp7htck2/Aassembly%20diagram%20for%20E1822.pdf?dl=0
Bill of Materials:
https://www.dropbox.com/s/o5g7abvwuk7fswp/Bill%20of%20materials%20for%20E1822.pdf?dl=0
User Manual:
https://www.dropbox.com/s/nrpzdw4nzp5n5cx/The%20main%20features%20of%20E1822.pdf?dl=0 id="descriptionImg">