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Introduction
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.
Before using the receiver, be sure to read this user guide
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.
Your comments and suggestions are welcome; please contact us at:
Trimble Construction Division
5475 Kellenburger Road
Dayton, Ohio 45424-1099 U.S.A.
Phone: (937) 245-5600
(800) 538-7800
FAX: (937) 233-9004
Internet: www.trimble.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the
clip-on general-purpose
clamp to attach to receiver.
9. Battery Housing—holds
two AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
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.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (
1
/16 in.) and
coarse: 6.0 mm (
1
/4 in.).
3. Liquid Crystal Display
(LCD)—shows the
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and
negative (–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode).
After the diagnostic
mode is complete, the grade sensitivity (fine) and the audio
(loud) symbols appear.
2. Press and hold the power/audio button for one second to turn off
the receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
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.
HR320 Receiver
User Guide
•
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.
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.
3. Move the receiver up/down until the LCD show an on-grade
reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow
Fine-high Fast beeping tone
Center bar
On-grade Continuous tone
Center bar &
up arrow
Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7 – – 8 –
–
2 – – 3 – – 4 –
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.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.trimble.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6