Introduction
Receiver
7. Clamp-Tab Recess—the
general-purpose clamp
Features and Functions
1. Power/Audio Button—is
a multi-functional button
that is used to turn on/off
the receiver and adjust the
volume.
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Thank you for choosing the Spectra Precision® Laser HR320 from
the Trimble® family of precision products. The HR320 is a
battery-operated laser receiver that detects a rotating laser beam and
indicates its position relative to the beam using LCD symbols.
HR320 Receiver
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8
3
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release tab fits into this area
locking the clamp in place.
User Guide
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8. Clamp Slots—allows the
clip-on general-purpose
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Before using the receiver, be sure to read this user guide
clamp to attach to receiver.
2. Grade-Sensitivity Button—
allows you to select
carefully. Included in it is information about setting up, using,
and maintaining the receiver. Also included in this manual are
CAUTIONS and Notes. Each of these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe
practice that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
9. Battery Housing—holds
two AA alkaline, Ni-MH,
or Ni-Cd batteries.
the receiver’s on-grade
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sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4 in.).
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10. Battery Door—holds the
6
batteries securely in place.
3. Liquid Crystal Display
(LCD)—shows the
elevation, grade sensitivity, audio,
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the
photocell and is used to mark elevation readings. The marking
notch is 50.0 mm (2 in.) from the top of the receiver.
Your comments and suggestions are welcome; please contact us at:
11. Label—shows the serial
number and manufacturing
date.
Trimble Construction Division
5475 Kellenburger Road
Dayton, Ohio 45424-1099 U.S.A.
Phone: (937) 245-5600
(800) 538-7800
FAX:
(937) 233-9004
6. Audio Port—the sound comes out of this opening.
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Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between
fine: 2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4 in.) grade
sensitivity.
How to Use the Receiver
Learning the Receiver Functions
LCD/Audio Information
Installing/Removing the Batteries
Turning On/Off the Receiver
LCD Readout
Function
Audio Output
1. Press the power/audio
button to turn on the
receiver.
Down arrow
High
Fast beeping tone
Above Grade
Audio On
Center bar &
down arrow
Grade Sensitivity
Fine-high
On-grade
Fine-low
Fast beeping tone
Continuous tone
Slow beeping tone
Note: When the
On Grade
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode).
After the diagnostic
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
Center bar
Battery Status
Center bar &
up arrow
Below Grade
3. Move the receiver up/down until the LCD show an on-grade
Up arrow
Battery
Battery
Horn
Low
Slow beeping tone
reading.
Full battery
Low battery
NA
mode is complete, the grade sensitivity (fine) and the audio
(loud) symbols appear.
N/A
2. Press and hold the power/audio button for one second to turn off
the receiver.
1. Open the battery door using a coin or your thumbnail.
Audio on/soft/loud
Fine grade sensitivity
Single beep
N/A
2. Install/Remove the 2 AA batteries noting the positive (+) and
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
Fine
negative (–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Coarse
Coarse grade sensitivity N/A
1. Press the power/audio button repeatedly to cycle through the
audio levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly
when the receiver is above the laser beam, slowly when below it,
and continuously when centered in the laser beam or on grade.
When audio is off, a single beep indicates laser is detected.
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