What Is It?

The Ameritec Model AM48^XT is a compact, user-friendly, yet powerful hand-held analog
transmission test set. Weighing less than 2 lbs., it can easily be transported in a briefcase
or slide into a tool kit. It is powered by four AA batteries or an accessory 110/220 VAC
adapter/recharger.

What Does It Do?

The Ameritec Model AM48^XT can do a variety of measurements. With its built-in dial
capability on dial-up networks it can access a distant responder or a second AM48XT
for centralized  2-wire testing. You can use a single unit with an Ameritec responder for
centralized loop back testing. Or, use two sets for a complete end-to-end test of 4-wire
data lines.

How Does It Work?

The user utilizes the color-coded controls and menu selection to select the desired
measure mode and send mode. Measurements are captured and are automatically
displayed. Immediate display indicates if the measurement is out of range over or under.
All controls are edge-mounted rocker switches or slide switches color coded with
descriptive labeling on the front of the unit for all switch functions. The keypad which
is normally used for dialing, has a unique secondary function which allows setting of all
control parameters associated with the more complex tests. The keypad is also able to
set signal generator levels and frequencies.

What Can It Test?

A single unit with the capability to do the measurements of three separate instruments.
Able to measure transmission circuits over the extended voice band 200 Hz to 20 kHz as
follows:

• dBm level or dB loss
• Frequency
• Frequency Response (Attenuation Distortion)
• Noise
• Noise with Tone
• Signal/Noise Ratio
• P/AR
• 3 Level Impulse Noise
• Phase and Gain Jitter
• Hits and Dropouts