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BK Precision 1856D 3.5GHz Frequency Counter (Frequency, Period, Totalize) 1856D

Our Price: $530.00

Quantity in Stock:1
Product Code: BK-1856D


The model 1856D provides versatility and reliability for a broad spectrum of laboratory and service applications.

  • RS232 Interface
  • Wide measuring range up to 3.5GHz
  • Bright nine digit LED display
  • Period mode for accurate low frequency measurement
  • Totalize mode permits counting of individual events
  • Accurate TCXO time base

Resolution and Number of Displayed Digits

Input A Characteristics
Frequency Range0.1 Hz to 100 MHz (DC coupled)
30 Hz to 100 MHz (AC coupled)
Sensitivity30 mV rms
CouplingAC or DC selectable
Impedance1 MΩ resistance shunted by < 40 pF
Attenuatorx1 or x10 switch selectable
Low Pass Filter-3 dB point at approx. 100 KHz, switch selectable
Accuracy± Time base error ± resolution (Table 1)
Resolution and Number of Displayed Digits
Gate Time0.01S0.1S1S10S
Number of Display Digits56677889
Frequency (Input A)Resolution
0.1 Hz-0.99 Hz10 µHz1 µHz1 µHz0.1 µHz0.1 µHz10nHz10nHz1nHz
1 Hz-9.9 Hz0.1mHz10 µHz10 µHz1 µHz1 µHz0.1 µHz0.1 µHz10nHz
10 Hz-99 Hz1 mHz0.1mHz0.1mHz10 µHz10 µHz1 µHz1 µHz0.1 µHz
100 Hz-999 Hz10mHz1 mHz1 mHz0.1mHz0.1mHz10 µHz10 µHz1 µHz
1 KHz-9.9 KHz0.1 Hz10 mHz10 mHz1 mHz1 mHz0.1 Hz0.1 mHz10 µHz
10 KHz-99 KHz1 Hz0.1 Hz0.1 Hz10 mHz10 mHz1 mHz1 mHz0.1mHz
100 KHz-999 KHz10 Hz1 Hz1 Hz0.1 Hz0.1 Hz10 mHz10 mHz1 mHz
1 MHz-9.9 MHz100 Hz10 Hz10 Hz1 Hz1 Hz0.1 Hz0.1 Hz10 mHz
10 MHz-99 MHz1 KHz100 Hz100 Hz10 Hz10 Hz1 Hz1 Hz0.1 Hz
100MHz10 KHz1 KHz1 KHz100 Hz100 Hz10 Hz10 Hz1 Hz
Max. Input Voltage Level
Period Range10 nS to 10 S
Displayn/µ/m (nano/micro/milli) Sec. with decimal point
Total Range10 Hz to 30 MHz
Capacity0 to 999 999 999, OVER FLOW: "OF"
RPM Range600 to 600 x 106 RPM, OVER FLOW: "OF"
Input C Characteristics
Frequency Range80 MHz to 3.5 GHz
Sensitivity15mV 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
CouplingAC only
Impedance50 Ω ±5%
Max. Input Level3 V rms sine wave
Resolution and Number of Displayed Digits
Gate Time0.01S0.1S1S10S
Number Of Displayed Digits56677889
Frequency (Input C)Resolution
100 MHz-999 MHz10 KHz1 KHz1 KHz100 Hz100 Hz10 Hz10 Hz1 Hz
1 GHz-3.7 GHz100 KHz10 KHz10 KHz1 KHz1 KHz100 Hz100 Hz10 Hz
Time Base Characteristics
TypeTCO (Temperature Controlled Oscillator)
Frequency10.000000 MHz
Stability±1 PPM (±1 count)
Line Voltage StabilityLess than ± 1 PPM with ± 10% line voltage variation
Temperature Stability±5 PPM from 0°C to 50°C
Max. Aging Rate±5 PPM/year
Int. Std. Out10 MHz (Internal Standard Frequency Output)
Level1 V p-p or more. TTL (10TTL)
Ext. Std. In10 MHz (External Standard Frequency Input)
Level1.5Vrms to 5Vrms
ImpedanceApprox. 600Ω
Display Characteristics
DisplayNine Digit 0.56" LED with M (Mega) or K (Kilo) Hz; nano, micro, or milli (n/µ/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
HoldIn 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 TimeDepending 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
NoteLast measurement display will remain for 10 seconds after signal off
Dimensions (WxHxD)9.4 x 3.5 x 10.6" (240 x 90 x 270mm)
Weight (Approx)5.5lbs. (2.5 kg.)
Power115VAC±10%, 50-60 Hz, 9 W
Plug and Socket3 wire ac power plug and 3 wire outlet
Fuse500 mA/ 250V F type
Temperature0 °C to +40 °C (Accuracy Specified at 23 °C ± 5 °C)
Humidityup to 85% RH (Relative Humidity) to 40 °C without temperature extremes causing condensation within the instrument
Temperature-20°C to +70°C
Humiditybelow 85% RH
Insulation Category IIPortable equipment of local level
Pollution Degree2
Protection to IEC 529Ordinary

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