58
Range 2.4GHz 175 MHz 200MHz 1.0GHz 2.5GHz
FUNCTIONS
Frequency √√√√√
Totalize √√
Period √√
Time Interval √
Ratio √
Time Base Stability ±0.1ppm ±0.1ppm ±0.1ppm ±0.1ppm ±4ppm
Best Resolution 0.1 Hz 0.1 Hz 1 Hz 1Hz 0.1 Hz
No. of Digits 8 8 7 7 8
Display Hold √√
Low Pass Filter √√
Sensitivity 10 mVrms 20 mVrms 25 mVrms 50mV 50mV
Remote Start-Stop √√
Self Test √√
B+K PRECISION counters provide versatility and
reliability for a broad spectrum of laboratory and service
applications. In addition to frequency measurement, most
B+K PRECISION counters also provide period and
totalize measurement capabilities.
COUNTER TERMS
FREQUENCY RATIO—Measurement of the frequency ratio of
two different input signals as applied to two different input
channels.
PERIOD—The time required for a single cycle of the input
event to occur. Measured in seconds or fractions of a second
and is the reciprocal of frequency. (i.e., Time = 1/Frequency).
PERIOD AVERAGING—Sampling a number of input periods
and displaying the average of these sampled periods.
PRESCALER—A frequency divider circuit which extends the
high frequency measurement capability of a counter.
SENSITIVITY—The lowest amplitude (strength) signal that the
counter will count.
TCXO—Temperature Compensated Crystal Oscillator. The
time base of the highest quality frequency counters is a TCXO,
which provides high accuracy and stability.
TIME BASE ACCURACY—The accuracy of a counter is
determined by the stability of its internal time base. Stability is
measured in parts per million (ppm), while undergoing
temperature and operating voltage variations.
TIME INTERVAL—Measurement of the time difference from
the edge of one channel’s input signal to the edge of another
channels’s input signal.
TOTALIZE—Continuous counting of the number of events
that have occurred since the counter was reset.
Model 1875
■ Handheld portable instrument for field use
■ High sensitivity for VHF and UHF frequencies
■Wide measuring range up to 2.5GHz
■ Data hold, Relative, and Memory
(Max, Min, Average reading)
Model 1803D & 1804D
■ Selectable gate times 0.1 sec and 1.0 sec
■ 7 digit LED display
■ High accuracy time display
■ Compact bench top AC powered counter
■ Wide measuring range up to:
200MHz(model 1803D)
1.0GHz(model 1804D)
Model 1823
■ Eight-digit display provides up to 0.1 Hz resolution
■ Period mode provides greater accuracy at low frequencies
■ Ratio mode combines two input frequencies and displays
their ratio
■ Totalize mode and Time interval mode add versatility
■ Large bright LED display
■ Selectable attenuators and low-pass filter prevent miscounts
due to input noise
Model 1856C
■ Wide measuring range up to 2.4GHz
■ Bright eight-digit LED display
■ Period mode for accurate low frequency measurement
■ Totalize mode permits counting of individual events
■ Accurate TCXO time base
Specifications
models
1856C 1823 1803D 1804D 1875
1803D
1875
1856C
1823
For your nearest distributor, call 800-462-9832 or www.bkprecision.com
59
FREQUENCY
KHz MODE 5Hz to 10MHz sinewave 5Hz to 175MHz 10Hz to 25MHz sinewave 10Hz to 16Mhz 10Hz to 10MHz
MHz MODE 5Hz to 100MHz sinewave 50kHz to 175MHz 10MHz to 200MHz sinewave 10MHz to 1.0 GHz 10MHz to 500Hz
50MHz to 2.4GHz 50MHz to 175MHz sinewave 100MHz to 2.5GHz
sinewave (prescale)
ACCURACY ±Time base accuracy +1 count ± 1 count ±1 time base error ±Time base accuracy +1 count ±(4ppm + dgt)
PERIOD CHARACTERISTICS
RANGE 0.285 µs to 200,000 µs 0.5 µs to 200,000 µs Does not apply Does not apply 10Hz to 10MHz
CONTROL Manual reset and hold from the Manual reset and hold from the
front panel START/ front panel START/
STOP jack is low STOP jack is low
INPUT CHARACTERISTICS
SENSITIVITY 20 mV rms, 5Hz to 30 MHz, 20 mV rms, 5 Hz to 5 MHz 25 mV rms, 5Hz to 30 MHz, 50mV ≤ 50mV, 5Hz -100MHz
50 mV rms above 100 MHz 50 mV rms, 5 Hz to 125 MHz 50 mV rms (10Hz to 200MHz) ≤100mV,
100 mV rms, 125 MHz to 30 MHz to 100 MHz 100MHz - 120GHz
150 MHz
150 mV rms, 150 MHz to
175 MHz
IMPEDANCE 1 MΩ(<40 pF) 1 MΩ (<40 pF) Direct: 1MΩ HF=1MΩ, VHF=50Ω1MΩ
ATTENUATOR X1/X10, switch selectable X1/X10, switch selectable High, Low on C channel
COUPLING AC AC AC AC AC
FILTER 100 kHz, -3 dB switch selectable 10 kHz, -3 dB switch selectable
PRESCALE
SENSITIVITY 10 mV rms, 30 MHz, 50 MHz to Does not apply Does not apply Does not apply Does not apply
600 MHz, 25 mV rms,
600 MHz to 1.3 GHz,
50 mV 1.3 GHz to 2.4 GHz
IMPEDANCE 50 Ω
COUPLING AC
MAXIMUM INPUT 1 V rms
TOTALIZE START/STOP INPUT
CHARACTERISTICS
LOGIC LEVELS Standard TTL levels Standard TTL levels
LOADING One standard TTL gate One standard TTL gate
TIME BASE CHARACTERISTICS
STANDARD TYPE TXCO Crystal controlled oscillator Crystal controlled oscillator Crystal oscillator
FREQUENCY 10 MHz 10 MHz (INT, EXT) 10 MHz 5.24288MHz 4.194MHz
STABILITY ±0.1 ppm (±1 Hz) ±0.1 ppm (±1 Hz) ±0.1 ppm ±0.1 ppm ±4ppm + 1 dgt.
LINE VOLTAGE STABILITY <±0.1 ppm ±10%
Less 1 ppm with ±
10%
line volt variation
10%
line volt variation
TEMPERATURE STABILITY ±10ppm (from 0˚C to 40˚C) ±1ppm (from 0˚C to 28˚C) <±10 ppm from 0˚ to 50˚C, <±10 ppm from 0.1 ppm/˚C
0˚C to 50˚C ambient, ±0.5 ppm 2 ppm 20˚C to 30˚C 0˚ to 50˚C
from 18˚C to 28˚C
EXTERNAL TIME BASE INPUT
10 MHz, >1.77V rms
DISPLAY CHARACTERISTICS
DISPLAY 0.56" seven segment LED - 0.56" seven segment LED - 0.43" seven segment LED - 0.43" seven segment 0.5" (13mm) LCD,
8 digits 8 digits 7 digits LED - 7 digits 8 digits
LED INDICATORS For kHz, MHz, µsSEC, Gate, For KHz, MHz, µsSEC, Gate, N/A N/A N/A
and overflow indicators and overflow indicators
GENERAL
POWER REQUIREMENTS 120/220/240 VAC ± 10%, 120/220/240 VAC ± 10%, 9VDC 300mA 7-10VDC 4 x 1.5V AA batteries,
50/60 Hz 12W 50/60 Hz 12W Battery operation: 6AA with 800mA optional AC/DC adapter
DIMENSIONS (H x W x D)
4.5 x11.75 x10.375"
2.8 x10.2x8.3" 2.1x 9.06x6.18" 2.1x 9.06x6.18"
6.8 x 3.1x1.4"
(114 x 298 x 264mm) (
71 x 261 x 211 mm) (54 x 230 x 157mm) (54 x 230 x 157mm)
(173 x 80 x 35 mm)
WEIGHT 3.98 lbs (1.8 kg) 3.98 lbs (1.8 kg) 24 oz (680 g) 24 oz (680 g) 12 oz (340 g)
Specifications
1856C 1823 1803D 1804D 1875
SUPPLIED: Instruction Manual, all models; AC adapter for models 1803D & 1804D
OPTIONAL: AT-21 antenna kit, AT-21 antenna kit, AT-21 antenna Kit AT-21 antenna Kit 9VDC 300mA AC/DC
adapter, AT-20 antenna
Accessories
models
One Year Warranty
Loading...