BK 1856D_manual 电路图.pdf

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1、1 Instruction Manual Model 1856D 3.7GHz Frequency Counter RadioFans.CN 收音机爱 好者资料库 2 WARRANTY Warranty service covers a period of one year from the date of original purchase. In case of technical failure within one year, repair service will be provided by our service center or sales outlet free of ch

2、arge. We charge customers for repairs after the one-year warranty period has expired. We charge for repairs regardless of the warranty period if failure resulted from the users negligence, natural disaster or accident. For more professional repair service, be sure to contact our service center or sa

3、les outlet. RadioFans.CN 收音机爱 好者资料库 3 Introduction Thank you for purchasing our product. Electronic measuring instruments produced by us are high technology products made under strict quality control. We guarantee their exceptional precision and utmost reliability. For proper use of the product, ple

4、ase read this operation manual carefully. Note ? To maintain the full precision and reliability of this product, use it within the temperature range of 10 C to 35 C (50 oF to 95 oF), and within a humidity of 45% to 85%. ? After turning on the power, allow a warm up period of about 30 minutes before

5、use. ? This equipment should be used with a triple line power cord for safety. ? Due to ongoing product development and improvement, things such as exterior design and technical specifications can change without prior notice. ? If you have further questions concerning use of this product, visit . Sa

6、fety Summary Please take a moment to read these operating instructions thoroughly and completely before operating this instrument. Pay particular attention to WARNINGS concerning conditions and actions that pose a hazard to the user and CAUTIONS describing conditions and actions that may damage the

7、instrument. ? Before every use, inspect the instrument and other accessories for signs of damage or abnormality. ? Keep your body isolated from ground. ? Never touch exposed wiring, connections or any live circuit conductors. ? Do not install substitute parts or perform any unauthorized modification

8、s on the instrument. ? Use caution when working above 60V DC or 30V AC rms. Such voltages pose a shock hazard. ? Remember that line voltage is present on circuit points such as on-off switches, fuse, power transformers, etc., even when the equipment is turned off. ? Remember that high voltage may ap

9、pear at unexpected points in defective equipment. Safety Symbols DANGEROUS VOLTAGE AC-ALTERNATING CURRENT DC-DIRECT CURRENT SEE EXPLANATION IN MANUAL GROUND FUSE RadioFans.CN 收音机爱 好者资料库 4 CONTENTS 1. PRODUCT DESCRIPTION 1-1. Introduction - (5) 1-2. Technical Specifications - (6) 1-3. Equipment Ratin

10、gs - (9) 1-4. Supplied Accessories - (10) 2. INSTALLATION 2-1. Initial Inspection - (10) 2-2. Connecting AC Power - (10) 2-3. Cooling and Ventilation - (10) 2-4. Position - (10) 2-5. Warming-Up - (11) 3. OPERATION 3-1. Controls, Indicators and Connectors - (11) 3-2. Operating Instructions- (14) 3-3.

11、 Frequency Measurements - (14) 3-4. Period Measurements - (16) 3-5. Total Measurements - (16) 3-6. RPM Measurements - (16) 3-7. Use of RS-232C Serial Interfacing - (17) 4. MAINTENANCE 4-1. Fuse Replacement - (18) 4-2. Adjustment and Calibration - (18) 4-3. Cleaning and Decontamination - (18) 5. OTHE

12、R 5-1. BNC Cable Considerations - (19) 5-2. Attenuator Probes - (20) 5-3. Line Frequency Measurements- (20) 1. PRODUCT DESCRIPTION 5 1-1. Introduction This reciprocal FREQUENCY COUNTER is a microprocessor-controlled instrument for frequency measurement. Due to uniquely developed LSI circuitry in an

13、expanding/reciprocal system, high accuracy with 9-digit resolution is achieved with a one second gate time. It covers a frequency range of from 0.1 Hz to 3.5 GHz based on a 10 MHz TCO (Temperature Controlled Oscillator). Other features include: ? RPM (Revolutions Per Minute) Measuring Function ? Ext

14、ernal Frequency Standard Input with 9 Digit LED Display ? Attenuator ? Period ? Total ? Low Pass Filter ? Line Filter Also provided is a self-test function for a quick check of several operating modes. Each mode can be selected by a front panel push button switch with automatic decimal points and in

15、dicators. The high accuracy, sensitivity and versatility of this counter make it an extremely valuable instrument to the scientist, engineer, experimenter and communications technician. Lightweight and compact size make it practical for use by the hobbyist or field technician. 6 1-2. Technical Speci

16、fications g INPUT A CHARACTERISTICS h FREQUENCY RANGE: 0.1 Hz to 100 MHz (DC coupled) 30 Hz to 100 MHz (AC coupled) h SENSITIVITY: 30 mV rms h COUPLING: AC or DC selectable. h IMPEDANCE: 1 M resistance shunted by 40 pF h ATTENUATOR: x1 or x10 switch selectable h LOW PASS FILTER: -3 dB point at appro

17、x. 100 KHz, switch selectable h ACCURACY: Time base error resolution (Table 1) h Resolution and Number of Displayed Digits Time Base Selector INT EXT INT EXT INT EXT INT EXT Gate Time 0.01S 0.1S 1S 10S Number of Display Digits 5 6 6 7 7 8 8 9 Frequency (Input A) RESOLUTION 0.1 Hz-0.99 Hz 10 uHz 1 uH

18、z 1 uHz 0.1 uHz 0.1 uHz 10nHz 10nHz 1nHz 1 Hz-9.9 Hz 0.1mHz 10 uHz 10 uHz 1 uHz 1 uHz 0.1 uHz 0.1 uHz 10nHz 10 Hz-99 Hz 1 mHZ 0.1mHz 0.1mHz 10 uHz 10 uHz 1 uHz 1 uHz 0.1 uHz 100 Hz-999 Hz 10mHz 1 mHz 1 mHz 0.1mHz 0.1mHz 10 uHz 10 uHz 1 uHz 1 KHz-9.9 KHz 0.1 Hz 10 mHz 10 mHz 1 mHz 1 mHz 0.1 Hz 0.1 mH

19、z 10 uHz 10 KHz-99 KHz 1 Hz 0.1 Hz 0.1 Hz 10 mHz 10 mHz 1 mHz 1 mHZ 0.1mHz 100 KHz-999 KHz 10 Hz 1 Hz 1 Hz 0.1 Hz 0.1 Hz 10 mHz 10 mHz 1 mHZ 1 MHz-9.9 MHz 100 Hz 10 Hz 10 Hz 1 Hz Hz 0.1 Hz 0.1 Hz 10 mHz 10 MHz-99 MHz 1 KHz 100 Hz 100 Hz 10 Hz 10 Hz 1 Hz 1 Hz 0.1 Hz 100MHz 10 KHz 1 KHz 1 KHz 100 Hz 1

20、00 Hz 10 Hz 10 Hz 1 Hz (Table 1) 7 h Max. Input Voltage Level FIG. 1 MAX. Input Level. (Input A) h PERIOD RANGE: 10 nS to 10 S DISPLAY: n/u/m (nano/micro/milli) Sec. with decimal point h TOTAL RANGE: 10 Hz to 30 MHz CAPACITY: 0 to 999 999 999, OVER FLOW : “OF” h RPM RANGE: 600 to 600 x 106 RPM, OVER

21、 FLOW : “OF” g INPUT C. CHARACTERISTICS h FREQUENCY RANGE: 80 MHz to 3.5 GHz h SENSITIVITY: 15mV from 80 MHz to 2000 MHz 20mV from 2000 MHz to 3.0 GHz 30mV from 3.0GHz to 3.2GHz 50mV from 3.2GHz to 3.5GHz h COUPLING: AC only h IMPEDANCE: 50 5% h MAX. INPUT LEVEL: 3 V rms sine wave 3 0 0 2 5 0 1 5 0

22、2 0 0 1 0 0 2 5 5 0 MAX INPUT VOLTAGE (ACV nano, micro, or milli (n/u/m) Sec.; GT (GATE TIME); H (HOLD); and OF (OVERFLOW) indicators. FUNCTION and GATE TIME are user selected. OF display is shown when the count exceeds 999 999 999. h HOLD: In the FREQUENCY, PERIOD, TOTAL, RPM modes, measurement in

23、progress is stopped; and the last complete measurement is displayed. When HOLD is released, a new measurement begins. 9 h GATE TIME: Depending on input frequency 10 mS- Somewhere between 0.9 and 9mS 0.1 S- Somewhere between 9 and 90mS 1 S-Somewhere between 90 and 900mS 10 S-Somewhere between 0.9 and

24、 9S NOTE: LAST MEASUREMENT DISPLAY WILL REMAIN FOR 10 SECONDS AFTER SIGNAL OFF. g DIMENSIONS AND WEIGHT h Dimensions (WxHxD): 9.4 x 3.5 x 10.6” (240 x 90 x 270mm) h Weigh (Approx)t: 5.5lbs. (2.5 kg.) 1-3. Equipment Ratings ? Power: 115VAC10% , 50-60 Hz, 9 W ? Plug and Socket: 3 wire ac power plug an

25、d 3 wire outlet ? Fuse: 500 mA/ 250V F type ? Operating Environment: TEMPERATURE: 0 C to + 40 C (Accuracy Specified at 23 C 5 C) HUMIDITY: up to 85% RH (Relative Humidity) to 40C without temperature extremes causing condensation within the instrument. ? Storage Environment: TEMPERATURE: -20C to +70C

26、 HUMIDITY: below 85% RH ? Insulation Category II: Portable equipment of local level. ? Pollution Degree: 2 ? Protection to IEC 529: Ordinary Note: Specifications are subject to change without notice. 10 1-4. Supplied Accessories ? Users Manual -1 ? BNC cable -1 ? Power cord-1 ? Spare Fuse-1 2. INSTA

27、LLATION 2-1. Initial Inspection This instrument was carefully inspected both mechanically and electrically before shipment. It should be physically free of damage. To confirm this, the instrument should be inspected for physical damage which may have occurred in transit. Also, verify that all suppli

28、ed accessories have been included. 2-2. Connecting AC Power This instrument requires 115V AC, 50-60 Hz power through a 3-conductor AC power cable to be plugged into a three-contact electrical outlet to secure grounding. If adapted into a 2-conductor cable, use the ground terminal on the rear panel f

29、or grounding the instrument. CAUTION THIS INSTRUMENT IS SET TO 115V, AC. BEFORE TURNING ON THE POWER TO THE INSTRUMENT, MAKE SURE THE VOLTAGE OF THE POWER SOURCE IS 115V, AC. 2-3. Cooling and Ventilation No special cooling and ventilation is required. However, the instrument should be operated where

30、 the ambient temperature is maintained. 2-4. Position This instrument is built as a bench-type instrument with rubber feet and tilt stand in place. The stand-up angle can be adjusted by changing the angle of the carrying handle. 11 2-5. Warming-Up Allow at least 30 minutes for the unit to warm up so

31、 that it can stabilize. 3. OPERATION 3-1. Controls, Indicators and Connectors ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 19 18 15 16 10 12 9 2 3 1 4 5 6 14 8 ? ? ? ? ? ? ? ? ? ?

32、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 20 ? FIG.2 FRONT PANEL GATE INDICATOR: The gate light, when lit, indicates the main gate is open and measurement is in progress. RS-232C INDICATOR: TX (transmitting), RX (receiving) blinking OVER FLOW INDICATOR: OF is displayed when

33、there is an overflow. DISPLAY: 9 digit (0.56“) green LED display used for all readings. NOTE: LAST MEASUREMENT DISPLAY WILL REMAIN FOR 10 SECONDS AFTER SIGNAL OFF. 12 UNIT INDICATOR: When lit, indicates that the frequency displayed is in MHz, KHz, Hz and period is in nano, micro, or milli (n/u/m) Se

34、c. HOLD INDICATOR: The HOLD function is engaged the when lit. INPUT C: Use this input for all frequency measurements above 80 MHz. Female N type connector terminated in 50. LOW PASS FILTER: With this switch pushed in, the A input is routed through a low-pass filter with a -3 dB point at approximatel

35、y 100 KHz. When it is released, the A input is applied directly to the counter. ATT. SWITCH: When this switch is set to x10 (pushed in) the A input is attenuated 10:1 before application to the counter. With the switch set to x1 (pushed out), the A input signal is applied unattenuated. The attenuator

36、 has no effect on the C input. COUPLE. SWITCH: This switch is used to select the input coupling mode, AC or DC. INPUT A: Use this input for frequency measurements below 100 MHz and all period measurements. Female BNC connector. Input impedance is1 M shunted by 40 pF. GATE TIME SWITCH: This switch se

37、lects the degree of resolution on the display in all modes except TOTAL. HOLD SWITCH: In the HOLD function, the display is held but the counter continues to increment. When HOLD is released, the display is updated and resumes counting. FUNCTION SWITCH: This selects the desired operating mode. a. FRE

38、Q. A: When this mode is selected, the counter reads the frequency of the input at A. Resolution is selected using the GATE TIME. b. FREQ. C: When this mode is selected, the counter reads the frequency of the input at C. All readings are in MHz. c. PERIOD A: When this mode is selected, the counter re

39、ads the period of the input at A. Resolution is selected using 13 the GATE TIME. d. TOTAL A: When this mode is selected, the unit counts the cycles of the signal at input A and continuously displays that count. e. RPM A: When this mode is selected, the unit displays the RPM (Revolutions Per Minute)

40、of the signal at input A. POWER SWITCH: This push type switch, turns on the power when pressed. TILT STAND: Pull out to adjust tilt. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

41、 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 6523 4 ? ? ? ? ? ? ? ? FIG.3 REAR PANEL AC INLET: AC power input connector INT/EXT TIME BASE SELECTOR: Selects the source of the time base. EXT.STD. IN sets up BNC as a nominal 600 input impedance path for an external 10 MHz time base signal. INT. STD. OUT sets up

42、BNC to monitor the internal time base signal. GROUND TERMINAL FUSE HOLDER: Replace fuse by unscrewing INT/EXT TIME BASE BNC: Provides a connector through which the internal time 14 base signal can be monitored or through which an external time base signal can be applied (see item above). The externa

43、l signal should have a voltage range of 1.5 V5 V rms. RS-232C CONNECTOR: Connector for serial interfacing with a computer. 3-2. Operating Instructions a. Connect the unit up to the AC power. b. Turn on the unit by pushing in the POWER on-off switch. c. Set the FUNCTION indicator position to FREQ A and the gate TIME indica