FC2001 Manual




The Aceco FC2001 hand-held frequency counter is a professional counter, even advanced features such as field strength measurement and auto hold are incorporated. It is compact, truly pocket sized, test instrument designed for ease of use and dependable performance. Supplied as a complete with internal NiCd pack, AC wall charger and 7 section telescopic antenna.


Frequency range

10 Hz - 3 GHz


250 g


100 mm high x 68 mm wide x 31 mm deep


1 * dual purpose BNC Socket
50 Ohms input for range 1 MHz to 3 GHz
1 Meg Ohm input for range 10 Hz to 50 MHz


Stamped aluminum with black anodized finish


Internal 4 x AA 600 mAH NiCd pack


9 VDC 300 mA


Less than 1 PPM at room temperature


  • 10 digit Liquid Crystal Display
  • Hi-Z low range
  • Automatic hold
  • Measures frequency and period
  • LED back light
  • Beeper
  • Low power consumption (Average 6 hour battery life)
  • Hold switch to lock display
  • Low battery indicator
  • Ultra sensitive synchronous detector 16 section bargraph to show RF signal strength
  • High speed 300 MHz direct counter with 0.1 Hz resolution
  • 4 selectable gate speeds


  1. Power Switch - This slide switch turns the counter on and initiates a 2 second test of all the LCD segments.
  2. Amp Switch - This slide switch selects either the 1 Meg Ohm high impedance amplifier or 50 Ohm amplifier and prescale.
  3. Range Switch - This should be switched to the 300 MHz position for frequencies between 1 MHz and 300 MHz and switched to the 3 GHz position for frequencies between 10 MHz and 3 GHz.
  4. Lite Switch - This slide switch turns the LCD back light on and off.
  5. Function Button - This selects the frequency or period. This button has four settings. One each for displaying frequency or period as these are received, and two settings for  automatic hold of the first frequency or period captured.
  6. Hold Button - This holds the current display and stops the counter from counting.
  7. Gate Button - This selects the gate or measurement time. A longer gate time allows counting for longer period and results in higher accuracy.
  8. Calibration - The calibration adjustment opening is located on the front panel of the  counter. This allows access to the trimmer capacitor that provides about a 10 PPM adjustment range of the time base oscillator. This is not usually necessary but to do so read a signal of an known frequency before adjusting the trimmer for correct frequency display. If you calibrate at 4.1943 MHz or above then the counter will be more accurate.


Aceco Electronics, Corp. guarantees the counter and accessories for one year against defects in manufacture. This warranty does not cover items that have been modified, subject to unauthorized repairs, misuse or abuse. This warranty does not cover damage caused by excessive power levels applied to the signal input. Never make any kind of connection between the counter and a transmitter.

Hints And Tips

  1. NiCd Operation
    This frequency counter can operate for up to six hours from its fully charged NiCd batteries. They are charged when the unit is plugged into the supplied AC/DC adapter. Full recharge will occur over 12 to 16 hours. Before recharging the batteries you should be deep cycled occasionally by allowing them to completely discharge to maintain maximum battery capacity. The NiCd batteries should last for several years. However, it is a good idea to check them every twelve months for signs of corrosion or leakage. Always replace the whole set if any one cell fails.
  2. Signal Input
    When using the counter with an antenna for signal pick up, random frequencies may appear on the display. This is quite normal and is caused by the high gain of the receiver circuits which amplify noise in the absence of a strong readable signal. Never get the unit too close to a transmitter as internal damage will result.
  3. Antenna Selection
    The supplied telescopic antenna is best for general purpose use. This is because its length can be adjusted to suit the frequency required. Usually you will want a shorter antenna for UHF and a fully extended one for VHF / HF.
  4. Reception Distance From Transmitter
    The distance from which you will be able to receive frequencies will depend upon the type and location of the transmitting antenna, transmitter output power and the frequency in use.
    Some typical distances are:

Cordless Phone

0.3 meters

Cellular Phone

3 - 20 m

CB radio

2 - 8 m

VHF Two Way Radio

3 - 30 m

UHF Two Way Radio

3 - 30 m

Input Sensitivity ( Typical )



1 Meg Ohm

50 Ohm


1 Meg Ohm 30 pF

50 Ohm VSWR less than 2:1


10 Hz - 50 MHz

1 MHz - 3 GHz


< 10 mV at 10 Hz - 10 MHz
< 20 mV at 10 MHz - 50 MHz

< 0.8 mV at 100 MHz
< 6 mV at 300 MHz
< 7 mV at 1.0 GHz
< 100 mV at 2.4 GHz

Max. input

100 Vrms

15 dBm

RF Signal Strength Bargraph



1st Segment

Full Scale

27 MHz

7 mV

100 mV

150 MHz

5 mV

90 mV

800 MHz

10 mV

200 mV

Frequency Display Resolution



Gate Time (Seconds)


Sample Display

300 MHz


10 Hz

300.00000 MHz


1 Hz

300.000000 MHz


1 Hz

300.000000 MHz


0.1 Hz

300.0000000 MHz

3 GHz


1000 Hz

3000.000 MHz


100 Hz

3000.0000 MHz


10 Hz

3000.00000 MHz


10 Hz

3000.00000 MHz