Instruction Manual 1 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 l l l l l 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%.
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.
1-1. 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 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).
1-2. Technical Specifications 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 MΩ resistance shunted by < 40 pF h ATTENUATOR: x1 or x10 switch selectable h LOW PASS FILTER: -3 dB point at approx.
h 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 F R E Q U E N C Y (H z ) 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 FLOW : “OF” g INPUT C. CHARACTERISTICS h FREQUENCY RANGE: 80 MHz to 3.
h Resolution and Number of Displayed Digits INT EXT Time Base Selector Gate Time 0.01S Number Of 5 6 Displayed Digits Frequency (Input C) 100 MHz-999 MHz 10 KHz 1 KHz 1 GHz-3.7 GHz 100 KHz 10 KHz INT EXT INT 0.1S 6 1 KHz 10 KHz EXT INT 1S 7 7 RESOLUTION 100 Hz 100 Hz 1 KHz 1 KHz EXT 10S 8 8 10 Hz 10 Hz 100 Hz 100 Hz 9 1 Hz 10 Hz (Table 2) g TIME BASE CHARACTERISTICS h TYPE: TCO (Temperature Controlled Oscillator) h FREQUENCY: 10.
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 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.
1-4. Supplied Accessories l l l l User’s Manual --------------------------------------------------------------1 BNC cable -------------------------------------------------------------------1 Power cord-------------------------------------------------------------------1 Spare Fuse-------------------------------------------------------------------1 2. INSTALLATION 2-1. Initial Inspection This instrument was carefully inspected both mechanically and electrically before shipment.
2-5. Warming-Up Allow at least 30 minutes for the unit to warm up so that it can stabilize. 3. OPERATION 3-1. Controls, Indicators and Connectors 2 1 3 4 5 6 TX 0 . F M/ n Hz RX k / u SEC 14 8 I NPUT C 3V MAX.50 m RMT G . T A C FREQ. A PRI OD A TOTA L A RPM 0 . 0 1 S 0 . 1 S 1 S H 80MH z 3.
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. Female N type connector terminated in 50Ω. LOW PASS FILTER: With this switch pushed in, the A input is routed through a low-pass filter with a -3 dB point at approximately 100 KHz.
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) 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.
base signal can be monitored or through which an external time base signal can be applied (see item above). The external signal should have a voltage range of 1.5 V~5 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 indicator to the 1 Sec, position. CAUTION 1.
e. Engaging the HOLD switch “freezes” the display at the existing reading. When HOLD is released, the display is updated and resumes counting. f. Engage the ATTENUATOR if necessary. When set to x10 (pushed in), the signal at input A is attenuated by a factor of approximately 10 before it is applied to the counter. This helps prevent miscounting caused by noisy or improperly terminated high amplitude signals. g. Engage the LOW PASS FILTER (LPF) if necessary.
3-4. Period Measurements a. Apply the signal to be measured at input A. b. Select the resolution using the GATE TIME selector switch. c. The period is indicated on the display. The gate indicator is lit while the measurement is in progress. d. The ATTENUATOR, LPF, and COUPLING switches operate the same as they do in the frequency measurements modes. 3-5. Total Measurements The totalize mode is used to count the total number of events occurring during a specific time period.
3-7. Use of RS-232C Serial Interfacing 1) Hardware/Software Requirements IBM PC/XT/AT or compatible computer Microsoft Windows Serial port for connection with counter 2) Output Data Formats (1) Baud rate : 9600BPS 1 start bit (0) 8 data bit 1 stop bit (1) NONE PARITY (2) To Frequency counter Command Parameter 'H' : HOLD '0' : OFF Terminate Code '1' : ON CR (0DH) '2' : TOGGLE 'G' : GATE '0' : 0.01 SEC '1' : 0.
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. COVERS MUST NOT BE REMOVED EXCEPT BY PERSONS QUALIFIED AND AUTHORIZED TO DO SO, AND THESE PERSONS SHOULD ALWAYS USE EXTREME CARE ONCE THE COVERS HAVE BEEN REMOVED. 4-1. Fuse Replacement a. Disconnect and remove all connections from any live power source. b. Unscrew the fuse holder with a screwdriver. c. Remove the defective fuse. d.
around the window cover areas where water could leak into the instrument while drying. 5. OTHER 5-1. BNC Cable Considerations The accuracy of radio frequency measurements can be affected by the connections between the signal source and counter. The main issues involved are standing waves and cable shunt capacitance. Waves propagating along a transmission line will be reflected at its ends if the line is not terminated in its characteristic impedance.
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. THESE PROBES ARE DESIGNED WITH A 10:1 ATTENUATION FOR AN INSTRUMENT WITH AN INPUT RESISTANCE OF 1 M Ω. THE 50 Ω TERMINATION OF INPUT C WOULD RESULT IN UNACCEPTABLY HIGH ATTENUATION. 5-3.
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 23 22820 Savi Ranch Parkway Yorba Linda, CA 92887 USA TEL: 714-921-9095 FAX: 714-921-6422
