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Features
- 10 digit Liquid Crystal Display
- Hi-Z low range
- Filter to prevent display of random noise
- 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
Controls
- Power Switch - This slide switch turns the counter on and initiates a 2 second test of all the LCD segments.
- Amp Switch - This slide switch selects either the 1 Meg Ohm high impedance amplifier or 50 Ohm amplifier and prescale.
- 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.
- Lite Switch - This slide switch turns the LCD back light on and off.
- Filter Switch - This slide switch turns the filter on and off.
- 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.
- Hold Button - This holds the current display and stops the counter from counting.
- Gate Button - This selects the gate or measurement time. A longer gate time allows counting for longer period and results in higher accuracy.
- 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.
Warranty 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
- 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
over12 to16 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.
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.
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.
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:
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