Sanjian Studio PLJ-0802-A Instruction manual

PLJ-0802-A
V 1.0
2014 年 8 月
36536-TE
7-digit LCD Frequency Counter Module
Information including Links and Code (Software) Supplied or Referenced in this Document is
supplied by MPJA inc. as a service to our customers and accuracy or usefulness is not
guaranteed nor is it an Endorsement of any particular part, supplier or manufacturer.
Use of information and suitability for any application is at users own discretion and user
assumes all risk.
All rights are retained by the Owners/Author(s)

CONTENTS
Overview ........................................................................................ 2
Technical Parameters......................................................................3
Operation ........................................................................................4
Two XH2.54-2P 20cm cables are included in the package. Please note
That these 2 connectors are keyed in reverse to each other.
Power: Red to + Symbol on board, Black to - Symbol
Signal: Red to ~ Symbol on board. Black to "Gnd"
Check the color polarity and connect correctly. Check the wiring polarity
of the socket assembly before applying power, and read the manual before
using the module to understand its operation.
Do not place the instrument in hot, humid, or dusty environments, and
mountings should prevent severe vibration.
After module is manufactured; the reference frequency oscillator was
aligned using a rubidium reference. The sensitivity adjustment has been
optimized so do not adjust unless necessary.
PRECAUTIONS
page 1
Precautions .................................................................................... 1
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PLJ-0802 intelligent frequency meter is a frequency measuring instrument
specially designed for embedded applications. It's small, simple and reliable.
Mainly used for DIY transceivers to display frequency value, and can also be used
for conventional frequency measurement.
Main features of this frequency meter are as follows:
Ø Microchip PIC16F648A forms the core of the 2.4GHz frequency meter.
Ø Frequency reference using a temperature-compensated voltage controlled
crystal oscillator (2.5 ppm VC-TCXO).
Ø Dual mode IF modes allow the offset value and the IF up / down mode to be
separately preset.
Ø Using LCD0802 liquid crystal display, it can display up to 7 digits, and the zero
is automatically blanked.
Ø Reverse power protected connection design, low power consumption battery
power supply scheme.
Ø 2 Button Control
Ø Setting is automatically saved in EEPROM, and it will be recalled directly at
next startup.
OVERVIEW
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TECHNICAL SPECIFICATIONS
1. GATE TIME
0.64sec
2. CHANNEL MEASUREMENT PERFORMANCE (CHANNEL LEVEL HIGH IMPEDANCE)
Measuring Range: 1 MHz ~ 1.2 GHz Accuracy: ± 100Hz
Channel sensitivity: (HM8134-2 Test Signal Generator)
Frequency (MHz) 5 10 30 60 100 150 200 300 450
mV RMS 35 20 10 3 3 4 8 15 12
Frequency (MHz) 500 550 600 700 800 900 1000 1100 1200
mV RMS 14 30 65 80 80 35 175 270 310
3. IF SETTINGS
Independent double-IF design allows the IF settings to be adjusted in minimum increments of 100 Hz.
Intermediate frequency range: 0 - 999.9999 MHz
Offset: It can be set to add to subtract from intermediate frequency
4. FREQUENCY REFERENCE
13.000MHz temperature compensated voltage controlled crystal oscillator (VC-TCXO) in 5032 package
Frequency stability: ± 2.5 ppm
5. SUPPLY
DC Input: 9V - 12V (Reverse polarity protected)
Current: <55 mA max (Test conditions Backlight on)


6. DISPLAY
Readout: 0802 2 line x 8 Character Backlighted LCD

8.Connections
DC IN (Power Interface): JST-HX2.54-2P socket
JST-HX2.54-2P socket
RF IN (signal input):
ICSP (programming interface): 2.54-6P Pin-Header



page 3
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OPERATION AND USE
+
~
Gnd
1. MODULE ARRANGEMENT and MOUNTING
2. USING THE MODULE
(A) PREPARATION
page 4
1. Please check the power supply voltage (DC 9V-12V) and confirm the power supply polarity before
use. The power supply circuit in the module has a series diode fitted to prevent operation when
the power supply is inadvertently connected with reverse polarity. This protects the module from
devastating consequences.
2. The signal input (2-pin) port may be connected directly to the measured signal (wired) or to an
antenna (inductive mode).
Turn on the instrument and warm it up for a few minutes, and then perform the measurement
operation after the frequency reference is stable. After the measurement, perform the
measurement operation.
3.
DISPLAY AREA
-
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3.MENU STRUCTURE
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1. One of two IF frequencies may be selected by using pin 4 of the ICSP programming
interface. If pin 4 is pulled High or left floating, then the first IF frequency is used. If pin 4 is
pulled to ground, then the second IF frequency is selected.
2. Each IF frequency can be independently programmed with IF frequency and offset (Add or
subtract). The first IF settings are programmed when pin 4 is pulled High or left floating, and.
the second IF settings are programmed when pin 4 is pulled to ground.
3. The default factory programming sets the floating pin 4 as the first IF configuration. If the IF
is zero, then the Up/Down setting is ignored.
4. In practice, pin 3 (GND) and pin 4 of the ICSP programming interface ICSP can be
connected to a 2P DuPont connector immediately adjacent or on the pins (See location circled
in red below). A switch can then be connected to select the appropriate IF setting.
16
4. SELECTION OF IF FREQUENCY
+
-
~
GND
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1. Hard Wired:
Connect Test Meter to the signal measurement point with an appropriate test cable.
Direct connection to Transmitter antenna port requires impeadence matching &
may require the use of attenuator(s). Excessive signal will damage meter.
2. Sensing Method
Connect Test Meter using inductive coupling to the transmitter under test.
Due to the high impedance input of meter; High power Radio frequency
transmitting devices may require the use of attenuator(s).
Strong radation fields may require meter shielding and moving meter away from
source as well as attenuator(s).
NOTE: Signal level < 50mV RMS may cause unstable readings.)
page 7
5.Meausurment Connection
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