BBK Electronics BK Precision 1856D User Manual

Instruction Manual

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.

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

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%.

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

use.

l This equipment should be used with a triple line power cord for safety.
l Due to ongoing product development and improvement, things such as exterior

design and technical specifications can change without prior notice.

l If 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.

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

l

damage or abnormality.

Keep your body isolated from ground.

l

Never touch exposed wiring, connections or any live circuit conductors.

l

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

l

instrument.

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

l

a shock hazard.

l 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.

l Remember 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:

l RPM (Revolutions Per Minute) Measuring Function
l External Frequency Standard Input with 9 Digit LED Display
l Attenuator
l Period
l Total
l Low Pass Filter
l 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 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

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. 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

Frequency (Input A)

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

5 6 6 7 7 8 8 9

RESOLUTION

(Table 1)

h Max. Input Voltage Level

300

250

200

150

100

MAX INPUT VOLTAGE (ACV & DCV)

50

25

5

0 100 500

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

FREQUENCY (Hz)

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 3.5 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 Ω ±5%

h MAX. INPUT LEVEL: 3 V rms sine wave