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BK Precision 1856D 3.5 GHz Multifunction Counter (Frequency, Period, Totalize). New in Box.	Discontinued Product Code: 1856D

Description Application Notes   Datasheet PDF Format 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  ± Time base error ± resolution (Table 1) 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  5 6 6 7 7 8 8 9 Frequency (Input A)  Resolution 0.1 Hz-0.99 Hz  10 µHz  1 µHz  1 µHz  0.1 µHz  0.1 µHz  10nHz  10nHz  1nHz 1 Hz-9.9 Hz  0.1mHz  10 µHz  10 µHz  1 µHz  1 µHz  0.1 µHz  0.1 µHz  10nHz 10 Hz-99 Hz  1 mHz  0.1mHz  0.1mHz  10 µHz  10 µHz  1 µHz  1 µHz  0.1 µHz 100 Hz-999 Hz  10mHz  1 mHz  1 mHz  0.1mHz  0.1mHz  10 µHz  10 µHz  1 µHz 1 KHz-9.9 KHz  0.1 Hz  10 mHz  10 mHz  1 mHz  1 mHz  0.1 Hz  0.1 mHz  10 µHz 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  1 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 (Table 1) Max. Input Voltage Level Fig. 1 Max. Input Level (Input A) Fig. 1 Max. Input Level (Input A) Period Range  10 nS to 10 S Display  n/µ/m (nano/micro/milli) Sec. with decimal point Total Range  10 Hz to 30 MHz Capacity  0 to 999 999 999, OVER FLOW: "OF" RPM Range  600 to 600 x 106 RPM, OVER FLOW: "OF" Input C Characteristics Frequency Range  80 MHz to 3.5 GHz 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 Coupling  AC only Impedance  50 Ω ±5% Max. Input Level  3 V rms sine wave 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 Displayed Digits  5 6 6 7 7 8 8 9 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) Time Base Characteristics Type  TCO (Temperature Controlled Oscillator) Frequency  10.000000 MHz Stability  ±1 PPM (±1 count) Line Voltage Stability  Less 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. Out Level Capacitance  10 MHz (Internal Standard Frequency Output) 1 V p-p or more. TTL (10TTL) 15pF Ext. Std. In Level Impedance  10 MHz (External Standard Frequency Input) 1.5Vrms to 5Vrms Approx. 600Ω Display Characteristics Display  Nine 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. 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 0.9 and 9S Note: Last measurement display will remain for 10 seconds after signal off. Dimensions and Weight Dimensions (WxHxD)  9.4 x 3.5 x 10.6" (240 x 90 x 270mm) Weight (Approx)  5.5lbs. (2.5 kg.) Equipment Ratings Power  115VAC±10%, 50-60 Hz, 9 W Plug and Socket  3 wire ac power plug and 3 wire outlet Fuse  500 mA/ 250V F type Operating 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. Storage Environment Temperature  -20°C to +70°C Humidity  below 85% RH Insulation Category II  Portable equipment of local level. Pollution Degree  2 Protection to IEC 529  Ordinary Features 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 TCO (Temperature Compensated Oscillator) time base Related Products... 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