B+K precision 1856D User manual

Instruction Manual

Model 1856D 3.7GHz Frequency Counter

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 repairsafter 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.

For more professional repair service, be sure to contact our service center or sales

outlet.

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

lTomaintain the full precision and reliability of this product,use it within the

temperature range of 10 °Cto 35 °C(50 oF to 95 oF), and within a humidity of

45% to 85%.

lAfter turning on the power, allow a warm up period of about 30 minutes before

use.

lThis equipment should be used with a triple line power cord for safety.

lDue to ongoing product development and improvement, things such as exterior

design and technical specifications can change without prior notice.

lIf you have further questions concerning use of this product, visit

www.bkprecision.com.

Safety 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 instrument.

lBefore every use, inspect the instrument and other accessories for signs of

damage or abnormality.

lKeep your body isolated from ground.

lNever touch exposed wiring, connections or any live circuit conductors.

lDo not install substitute parts or perform any unauthorized modifications on the

instrument.

lUse caution when working above 60V DC or 30V AC rms. Such voltages pose

a shock hazard.

lRemember that line voltage is present on circuit points such as on-off switches,

fuse, power transformers, etc., even when the equipment is turned off.

lRemember that high voltage may appear at unexpected points in defective

equipment.

Safety Symbols

DANGEROUS VOLTAGE

AC-ALTERNATING CURRENT

DC-DIRECT CURRENT

SEE EXPLANATION IN MANUAL

GROUND

FUSE

CONTENTS

1. PRODUCT DESCRIPTION

1-1. Introduction -----------------------------------------------------

(5)

1-2. Technical Specifications ------------------------------------ (6)

1-3. Equipment Ratings ------------------------------------------- (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. 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. OTHER

5-1. BNC Cable Considerations --------------------------------- (19)

5-2. Attenuator Probes -------------------------------------------- (20)

5-3. Line Frequency Measurements---------------------------- (20)

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 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:

lRPM (Revolutions Per Minute) Measuring Function

lExternal Frequency Standard Input with 9 Digit LED Display

lAttenuator

lPeriod

lTotal

lLow Pass Filter

lLine 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 indicators. 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.

1-2. Technical Specifications

gINPUT A CHARACTERISTICS

hFREQUENCY RANGE: 0.1 Hz to 100 MHz (DC coupled)

30 Hz to 100 MHz (AC coupled)

hSENSITIVITY: 30 mV rms

hCOUPLING: AC or DC selectable.

hIMPEDANCE: 1 MΩresistance shunted by < 40 pF

hATTENUATOR: x1 or x10 switch selectable

hLOW PASS FILTER: -3 dB point at approx. 100 KHz, switch selectable

hACCURACY: ±Time base error ±resolution (Table 1)

hResolution 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

56677889

Frequency (Input A)

RESOLUTION

0.1 Hz-0.99 Hz 10 uHz 1 uHz 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 mHz 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

1KHz 1KHz 100 Hz 100 Hz 10 Hz 10 Hz 1 Hz

(Table 1)

hMax. Input Voltage Level

FIG. 1 MAX. Input Level. (Input A)

hPERIOD RANGE: 10 nS to 10 S

DISPLAY: n/u/m (nano/micro/milli) Sec. with decimal

point

hTOTAL RANGE: 10 Hz to 30 MHz

CAPACITY: 0 to 999 999 999, OVER FLOW : “OF”

hRPM RANGE: 600 to 600 x 106RPM, OVER FLOW : “OF”

gINPUT C. CHARACTERISTICS

hFREQUENCY RANGE: 80 MHz to 3.5 GHz

hSENSITIVITY: 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

hCOUPLING: AC only

hIMPEDANCE: 50 Ω±5%

hMAX. INPUT LEVEL: 3 V rms sine wave

300

250

150

200

100

MAX INPUT VOLTAGE (ACV & DCV)

50100 500

FREQUENCY (Hz)

1K 1M 5M 10M 50M 100M

hResolution and Number of Displayed Digits

Time Base Selector

INT EXT INT EXT INT EXTINT EXT

Gate Time 0.01S 0.1S 1S 10S

Number Of

Displayed Digits 56677889

Frequency (Input C)

RESOLUTION

100 MHz-999 MHz 10 KHz 1 KHz 1 KHz 100 Hz 100 Hz 10 Hz 10 Hz 1 Hz

1 GHz-3.7 GHz 100 KHz

10 KHz 10 KHz 1 KHz 1 KHz 100 Hz

100 Hz

10 Hz

(Table 2)

gTIME BASE CHARACTERISTICS

hTYPE: TCO (Temperature Controlled Oscillator)

hFREQUENCY: 10.000000 MHz

hSTABILITY: ±1 PPM (±1 count)

hLINE VOLTAGE STABILITY:

Less than ±1 PPM with ±10% line voltage variation

hTEMPERATURE STABILITY:

±5 PPM from 0°C to 50°C

hMAX. AGING RATE: ±5 PPM/year

hINT. STD. OUT: 10 MHz (Internal Standard Frequency Output)

LEVEL: 1V p-por more. TTL (10TTL)

CAPACITANCE: 15pF

hEXT. STD. IN: 10 MHz (External Standard Frequency Input)

LEVEL: 1.5Vrms to 5Vrms

IMPEDANCE: Approx. 600Ω

gDISPLAY CHARACTERISTICS

hDISPLAY: Nine Digit 0.56" LED with M (Mega) or K (Kilo) Hz; 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.

hHOLD: 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.

hGATE 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.

gDIMENSIONS AND WEIGHT

hDimensions (WxHxD): 9.4 x 3.5 x 10.6” (240 x 90 x 270mm)

hWeigh (Approx)t: 5.5lbs. (2.5kg.)

1-3. Equipment Ratings

lPower: 115VAC±10% , 50-60 Hz, 9W

lPlug and Socket: 3 wire ac power plug and 3 wire outlet

lFuse: 500 mA/ 250V F type

lOperating Environment:

TEMPERATURE: 0°C to + 40 °C (Accuracy Specified at 23°C ±5 °C)

HUMIDITY: up to 85% RH (Relative Humidity) to 40°C without

temperature extremes causing condensation within the

instrument.

lStorage Environment:

TEMPERATURE: -20°C to +70°C

HUMIDITY: below 85% RH

lInsulation Category II: Portable equipment of local level.

lPollution Degree: 2

lProtection to IEC 529: Ordinary

Note: Specifications are subject to change without notice.

1-4. Supplied Accessories

lUser’s Manual --------------------------------------------------------------1

lBNC cable -------------------------------------------------------------------1

lPower cord-------------------------------------------------------------------1

lSpare Fuse-------------------------------------------------------------------1

2. INSTALLATION

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 supplied accessories have been included.

2-2. Connecting AC Power

This instrument requires 115VAC, 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 for

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 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.

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