Instruction Manual Model 1856D 3.
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 charge. 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 user’s negligence, natural disaster or accident.
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, please read this operation manual carefully. Note To maintain the full precision and reliability of this product, use it within the o o temperature range of 10 °C to 35 °C (50 F to 95 F), and within a humidity of 45% to 85%.
CONTENTS 1. PRODUCT DESCRIPTION 1-1. Introduction ----------------------------------------------------1-2. Technical Specifications -----------------------------------1-3. Equipment Ratings ------------------------------------------1-4. Supplied Accessories ---------------------------------------- (5) (6) (9) (10) 2. INSTALLATION 2-1. Initial Inspection ----------------------------------------------2-2. Connecting AC Power --------------------------------------2-3.
1. PRODUCT DESCRIPTION 1-1. Introduction This reciprocal FREQUENCY COUNTER is a microprocessor-controlled instrument for frequency measurement. Due to uniquely developed LSI circuitry in an expanding/reciprocal system, high accuracy with 9-digit resolution is achieved with a ten 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).
1-2. Technical Specifications INPUT A CHARACTERISTICS FREQUENCY RANGE: 0.1 Hz to 100 MHz (DC coupled) 30 Hz to 100 MHz (AC coupled) SENSITIVITY: 30 mV rms COUPLING: AC or DC selectable. IMPEDANCE: 1 MΩ resistance shunted by < 40 pF ATTENUATOR: x1 or x10 switch selectable LOW PASS FILTER: -3 dB point at approx. 100 KHz, switch selectable ACCURACY: 0.1Hz to 999Hz + Time base stability + 1 count + 1Hz 1KHz to 99KHz + Time base stability + 1 count + 0.
(Table 1) Max. Input Voltage Level MAX INPUT VOLTAGE (ACV & DCV) 300 250 200 150 100 50 25 5 0 100 500 1K 1M 5M 10M 50M 100M FREQUENCY (Hz) FIG. 1 MAX. Input Level. (Input A) PERIOD RANGE: 10 nS to 10 S DISPLAY: n/u/m (nano/micro/milli) Sec. with dec point Accuracy: + Time base stability + 0.3% + 1 count TOTAL RANGE: 10 Hz to 30 MHz CAPACITY: 0 to 999 999 999, RPM RANGE: 6 600 to 600 x 10 RPM, OVER FLOW : OVER FLOW : “OF” “OF” INPUT C.
Resolution and Number of Displayed Digits Time Base Selector INT EXT Gate Time 0.01S Number Of 5 6 Displayed Digits Frequency (Input C) 80 MHz-999 MHz 10 KHz 1 KHz 1 GHz-3.7 GHz 100 KHz 10 KHz INT EXT INT 7 7 0.1S 6 1 KHz 10 KHz EXT INT 8 8 1S RESOLUTION 100 Hz 100 Hz 1 KHz 1 KHz EXT 10S 10 Hz 10 Hz 100 Hz 100 Hz 9 1 Hz 10 Hz (Table 2) TIME BASE CHARACTERISTICS TYPE: TCO (Temperature Controlled Oscillator) FREQUENCY: 10.
user selected. OF display is shown when the count exceeds 999 999 999. HOLD: In the FREQUENCY, PERIOD, TOTAL, RPM modes, measurement in progress is stopped; and the last complete measurement is displayed. When HOLD is released, a new measurement begins. 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.
HUMIDITY: below 85% RH Insulation Category II: Portable equipment of local level. Pollution Degree: Protection to IEC 529: Ordinary 2 Information and specifications are subject to change without notice. Please visit www.bkprecision.com for the most current product information. 1-4.
be operated where 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. 2-5. Warming-Up Allow at least 30 minutes for the unit to warm up so that it can stabilize. 3. OPERATION 3-1.
OVER FLOW INDICATOR: OF is displayed when 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. 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) Sec. HOLD INDICATOR: The HOLD function is engaged the when lit. INPUT C: Use this input for all frequency measurements above 80 MHz.
display is updated and resumes counting. FUNCTION SWITCH: This selects the desired operating mode. a. FREQ. 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 reads the period of the input at A. Resolution is selected using the GATE TIME. d.
INT/EXT TIME BASE SELECTOR: Selects the source of the time base. up BNC EXT.STD. IN sets as a nominal 600Ω input impedance path for an external 10 MHz time base signal. sets up BNC INT. STD. OUT 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 base signal can be monitored or through which an external time base signal can be applied (see item above).
3-3. Frequency Measurements A. INPUT A (0.1 Hz to 100 MHz): a. Apply the signal to be measured at input A. b. Set the FUNCTION indicator to FREQ. A c. Select the resolution using the GATE TIME selector switch. d. The frequency is indicated on the display. The gate indicator is lit while the measurement is in progress, and the display is updated at the end of each measurement interval. e. Engaging the HOLD switch “freezes” the display at the existing reading.
d. The frequency is indicated on the display. The gate indicator is lit while the measurement is in progress, and the display is updated at the end of each measurement interval. e. Engaging the HOLD switch “freezes” the display at the existing reading, When HOLD is released, the display is updated and resumes counting. f. The ATTENUATOR, LPF, and COUPLING switches have no effect with input C. 3-4. Period Measurements a. Apply the signal to be measured at input A. b.
RELEASED, THE UPDATED COUNT WILL BE DISPLAYED. 3-6. RPM (Revolutions Per Minute) Measurement a. Apply the signal to be measured at input A. The count will be displayed as revolutions per minute (RPM). Maximum count is 999999999. If this is exceeded, the overflow message, OF, will be displayed. b. The ATTENUATOR, LPF, and COUPLING switches operate the same as they do in the frequency measurements modes. 3-7.
'R' : REMOTE '0' : OFF CR(0DH) '1' : ON N*= 0 1 2 3 4 5 6 7 3.5GHz,F/C FA NC FC PERIOD TOTAL RPM NC NC (3) From Frequency counter DATA UNIT 10BYTES include dp 4bytes CR 4. MAINTENANCE CAUTION FOR SAFETY, IT IS ESSENTIAL TO PROPERLY MAINTAIN AND SERVICE THIS INSTRUMENT WARNING VOLTAGES WITHIN THIS INSTRUMENT ARE SUFFICIENTLY HIGH TO BE LETHAL.
4-2. Adjustment and Calibration Regular adjustment and calibration of this instrument is recommended. The procedures involved should be executed by qualified and authorized personnel only. 4-3. Cleaning and decontamination The instrument can be cleaned with a soft clean cloth to remove any oil, grease or grime. Never use liquid solvents or detergents. If the instrument gets wet for any reason, dry it using low-pressure clean air at less than 25 PSI.
Input C has a built in impedance of 50Ω, thus the need for an external termination is eliminated. In situations where a 50Ω termination could affect bias voltages or other DC voltages in the circuit under test, a blocking capacitor should be used. 5-2. Attenuator Probes When measuring signals at input A that will exceed its maximum input voltage level (See FIG. 1), a 10:1 attenuating probe such as an oscilloscope probe should be used. NOTE DO NOT USE A 10:1 PROBE WITH THE INPUT C.
GROUND (VIA THE 3-WIRE POWER CORD OF THE INSTRUMENT). TOUCHING THE “GROUND" LEAD TO THE 'HOT" SIDE OF THE LINE WOULD PLACE A DIRECT SHORT ON THE POWER LINE THROUGH THE PROBE CABLE, RESULTING IN A BIG SPARK, DAMAGE TO THE PROBE CABLE, AND POSSIBLE INJURY TO THE USER.
Limited One-Year Warranty B&K Precision Corp. warrants to the original purchaser that its product and the component parts thereof, will be free from defects in workmanship and materials for a period of one year from the data of purchase. B&K Precision Corp. will, without charge, repair or replace, at its’ option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the form a sales receipt. To obtain warranty coverage in the U.S.A.
Service Information Warranty Service: Please return the product in the original packaging with proof of purchase to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device. Non-Warranty Service: Return the product in the original packaging to the below address. Clearly state in writing the performance problem and return any leads, connectors and accessories that you are using with the device.
PN: 481-532-9-001 Printed in Korea 2004 B&K Precision Corp. 24 22820 Savi Ranch Parkway Yorba Linda, CA 92887 USA TEL: 714-921-9095 FAX: 714-921-6422 www.bkprecision.
