FD-252 / FD-250 / FD-130 - Frequency Counters

FD-252 / FD-250 / FD-130 - Frequency Counters
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-571-8431
Visit us at www.TestEquipmentDepot.com
FD-252, FD-250, FD-130 FREQUENCY COUNTERS
The FD-250 digital frequency counter is an instrument designed to
measure frequencies ranging from 20 Hz to 160 MHz through a highimpedance input.
The FD-252 digital frequency counter is designed for application that
require a higher frequency range. For that purpose the instrument is
equipped with a second input for measurement up to 2.4 GHz with an
impedance of 50 W.
SPECIFICATIONS
Input A
Frequency range
Maximum measurement frequency
Sensitivity
Input impedance
Maximum input voltage
Selectable low pass filter
Input B
Frequency range
Sensitivity
Input impedance
Maximum input voltage
General
Accuracy
Standard time base
Frequency
Temperature coefficient
Optional time base (TCXO)
(FD-250/1 or FD-252/1 option)
Frequency
Stability
Ageing at constant temperature
Display
Selectable gate times
FD-250
Both have an excellent frequency sensitivity and three selectable gate
time fixed values: 2 sec., 0.2 sec., and 20 msec., thus enabling the user
to obtain an optimum ratio between the measurement time and the
resolution. In addition, both have a selectable band-pass filter at input
A. In this way it is possible to measure low-frequency signals, removing
interferences in the measure.
They are equipped with an 8 digit L.E.D. display which facilitates frequency reading.
FD-252
20 Hz to 160 MHz
Selectable at 20 MHz or 160 MHz
From 20 Hz to 80 MHz < 15 mV rms. From 80 MHz to 160 MHz < 25 mV rms
1 MW // 35 pF
250 V AC (up to 100 kHz)
50 kHz (-3 dB), range selector at 20 MHz
100 MHz to 2,4 GHz
From 100 MHz to 1 GHz < 10 mV
From 1 GHz to 2.4 GHz < 50 mV
50 W
100 V DC or peak AC (50 Hz) RF + 18 dBm
Mechanical features
Dimensions
Weight
5 Hz to 25 MHz
Selectable at 5 Hz to 25 MHz
From 10 Hz to 20 MHz < 15 mV rms
1 MW // 25 pF
30 V AC (up to 100 kHz)
5 KHz
20 MHz to 1.3 GHz
From 20 MHz to 700 MHz < 10 rms
From 700 MHz to 1.3 GHz < 50 rms
50 W
30 V DC
± 1 count ± time base accuracy
10 MHz
0.2 ppm / ºC from 15 to 45 ºC
10 MHz
± 1 ppm from 0 to 50 ºC
± 0.5 ppm / month, ± 1 ppm / year
8 L.E.D.digits
2 s - 0.2 s - 20 ms (Input A)
2 s - 0.2 s - 20 ms
4 s - 0.4 s - 40 ms (Input B)
Resolution
20 Hz to 20 MHz
1 Hz - 10 Hz - 100 Hz (depending on gate times)
20 MHz to 160 MHz
10 Hz - 100 Hz - 1 kHz (depending on gate times)
100 MHz to 2.4 GHz (FD-252)100 Hz - 1 kHz - 10 kHz (depending on gate times)
Power supply
Mains voltage
Consumption
Battery
FD-130
110-125-220-230-240 V AC / 50-60 Hz
10 W
W. 212 x H. 102 x D. 241 mm
1.4 kg
0.3 ppm / ºC from 18 to 28 ºC
± 2 ppm from 0 to 50 ºC
<± 5 ppm / year
8 L.C.D.digits
0.1 s, 1 s and 10 s
Input A from 5 Hz to 25 MHz
Resolution 0.0001 Hz to 10 Hz
Input B from 20 Hz to 1.3 GHz
Resolution 1 Hz to 1 KHz
9V
W. 81 x H. 178 x D. 30mm
190 g without battery
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