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Cat. No. 22-306
OWNER’S MANUAL
Please read before using this equipment.
LCD RF Frequency Counter
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FEATURES
Your RadioShack LCD RF Frequency Counter is a mi- crocomputer-based instrument that accurately measures radio frequency (RF) or logic frequency signals. It is ideal for the home electronic hobbyist or a small repair shop. Use it to measure cordless telephone, ham, CB radio, radio-controlled toy remotes, radio/TV circuits, or digital instrument frequencies.
Your counter can measure RF signals within a 1 MHz– 1.3 GHz range or logic frequency signals within a 0 Hz–10 MHz range. You can display the frequency with different resolutions and update rates.
The counter’s features include:
Selectable Measurement Gate Times — let you choose a fast setting for quick measurement updates or a slow setting for maximum resolution.
Selectable Input Impedance — lets you select 50ohm impedance (for use with the supplied antenna or an optional 50-ohm coaxial cable) or high input impedance (for use with an optional high-impedance probe).
©1997 Tandy Corporation. All Rights Reserved.
RadioShack is a registered trademark used by Tandy Corporation.
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Selectable Input Frequency Range — you can choose between 1 MHz and 50 MHz or between 50 MHz and 1.3 GHz for RF, or between 0 Hz and 10 MHz for logic frequency.
BNC Connector — lets you connect the supplied antenna to measure through-air RF signals, or a cable with a male BNC connector (not supplied) for direct frequency measurements.
Backlight — makes the display easy to see in low-light conditions.
Hold — freezes the data on the display.
Recharging Circuit — lets you recharge nickelcad- mium batteries while they are installed in the counter.
You need four AA batteries or an AC adapter to use this counter (see “Connecting Power” on Page 5).
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CONTENTS |
|
Preparation ............................................................. |
5 |
Connecting the Antenna ................................... |
5 |
Connecting Power ............................................. |
5 |
Using Batteries .......................................... |
6 |
Recharging Nickel-Cadmium Batteries ...... |
9 |
Using AC Power ....................................... |
11 |
Connecting an Optional Coaxial Cable ........... |
13 |
Operation .............................................................. |
14 |
Turning On/Off the Counter ............................. |
14 |
Setting the Input Impedance ........................... |
14 |
Setting the Frequency Range ......................... |
15 |
Setting the Gate Speed ................................... |
16 |
Using the Backlight ......................................... |
18 |
Using Hold ....................................................... |
18 |
Measuring Frequencies ................................... |
19 |
Care and Maintenance ......................................... |
23 |
Specifications ....................................................... |
25 |
Typical Input Sensitivity ................................... |
28 |
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PREPARATION
CONNECTING THE ANTENNA
To connect the supplied antenna to the connector, place it over the connector on top of the counter and align the recess on the antenna with the two tabs on the connector. Then slightly push down on the antenna’s connector and turn it clockwise until it locks.
Note: You can also connect an antenna (not supplied) that is tuned to the frequency band of the signal you want to measure.
CONNECTING POWER
You can power your counter from four AA batteries (alkaline or rechargeable nickel-cadmium) or from a standard AC outlet using an AC adapter (not supplied).
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Using Batteries
Your counter can use four AA batteries (not supplied) for power. We recommend alkaline batteries, such as RadioShack Cat. No. 23-552. You can also use rechargeable nickel-cadmium batteries, such as Cat. No. 23-125.
Cautions:
•Only use fresh batteries of the required size and type.
•Do not mix old and new batteries, different types of batteries (standard, alkaline, or rechargeable), or rechargeable batteries of different capacities.
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Follow these steps to install batteries into the counter.
1.Use a Phillips screwdriver to loosen the screw on the counter’s battery compartment cover. Then remove the cover.
2.Using a small screwdriver, set the counter’s battery type switch to the appropriate position — ALKALINE for alkaline batteries or Ni-Cd for rechargeable nickel-cadmium batteries.
3.Put the batteries in the compartment as indicated by the polarity symbols (+ and –) marked inside.
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Warning: If you use alkaline or other nonrechargeable batteries, do not connect the AC adapter to the counter with the battery type switch set to Ni-Cd. Doing so activates the counter’s charging circuit. Trying to charge non-recharge- able batteries can cause the batteries to leak or explode, possibly causing personal injury.
4.Replace the battery compartment cover, then tighten the screw to secure the cover.
When the battery voltage becomes too low, or there is a low AC voltage condition, BATT appears on the lower left corner of the display and the counter might display incorrect measurements. If BATT appears, replace or recharge the batteries or check the AC connection.
To ensure consistent operation, replace alkaline batteries at least every 12 months.
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Recharging Nickel-Cadmium Batteries
To recharge nickel-cadmium batteries, you need an AC adapter (such as Cat. No. 273-1455) (see “Using AC Power” on Page 11).
Warning: Do not try to recharge alkaline or other nonrechargeable batteries. They might rupture or explode.
Follow these steps to recharge nickel-cadmium batteries while they are inside the counter.
1.Be sure the battery type switch is set to Ni-Cd.
2.Plug the AC adapter’s barrel plug into the DC 9V jack on the left side of the counter.
3.Plug the other end of the adapter into a standard AC outlet.
4.Charge the batteries for 12 to 14 hours.
Caution: Charging batteries for longer than the recommended time can damage them.
5.Unplug the adapter from the AC outlet first. Then unplug it from the DC 9V jack.
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Note: Occasionally, fully discharge nickel-cadmium batteries before you recharge them. Otherwise, the batteries lose their ability to fully charge.
Important: Your counter can use rechargeable nickelcadmium batteries. At the end of a battery’s useful life, it must be recycled or disposed of properly. Contact your local, county, or state hazardous waste management authorities for information on recycling or disposal programs in your area. Some options that might be available are: municipal curbside collection, drop-off boxes at retailers such as your local RadioShack store, recycling collection centers, and mail-back programs.
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