Omega HHP-SG User manual

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User’s Guide
HHP-SG
Handheld Strain Gage Indicator
Operator’s Manual
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HHP-SG

The information contained in this document is believed to be correct, but OMEGA accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.
Servicing North America:
U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047
Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
For Other Locations Visit omega.com/worldwide
omega.com [email protected]

1. Getting Started
1.1 Un acking 1
1.2 General Descri tion 1
1.3 Features 2
2. Safety onsiderations 3
3. Installation and Operation
3.1 Front of the Meter 4
3.2 Rear of the Meter 6
3.3 Factory Settings 7
3.4 Battery Installation or Re lacement 7
3.5 Transducer Hooku 8
4. alibration, Gain Selection and Adjustments 9
4.1 Switches & Jum er Locations 9
5. ustomized Scaling Procedure 15
6. Specifications 19
TABLE OF CONTENTS
i

FIGURES
3.1 Front Panel 4
3.2 Rear View 6
4.1 Zero Calibration 9
TABLES
4.1
Gain Resistor Selection for 1.24 Volts Excitation Voltage 10
4.2
Gain Resistor Selection for 2.50 Volts Excitation Voltage 11
4.3
Zero Resistor Selection 12
4.4 S3 Jum er Switch Descri tion 13
4.5 Solder Switch Descri tion 13
5.1 Gain Switch Settings 18
FIGURES AND TABLES
ii

SETUP
1
1
1.1 Unpacking
Remove the acking list and verify that you have received all
equi ment. If you have any questions, contact the Customer
Service De artment nearest you.
U on recei t of shi ment, ins ect the container and equi ment for
any signs of damage. Note any evidence of rough handling in
transit. Immediately re ort any damage to the shi ing agent.
The carrier will not honor any claims unless all shi ing
material is saved for their examination. After examining and
removing contents, save acking material and carton in the
event reshi ment is necessary.
Please ensure that a 9 Volt battery is included.
1.2 General Description
The hand held calibrator is a digital indicator for strain gage ty e
transducers such as load cells, torque sensors, or millivolt ressure
sensors. It rovides excitation voltage for the transducer and
dis lays the readings on a liquid crystal dis lay (LCD). The LCD
has a 3 1/2 active digits (0-1999 counts) and an additional dummy
zero if needed. The calibrator can dis lay either the actual value of
the signal (tracking mode) or the eak value ( eak mode). It
o erates on a standard 9 Volt battery and rovides an indication of
low battery.

SETUP
1
2
1.2 General Description (continued)
It has two internal reference voltages for owering the bridge. The
1.24 Volt reference is used with the 1K Ohm bridge and below
whereas the 2.5 Volt with the 2.5K/5K Ohm bridges and above.
Failure to ro erly select the excitation voltage can result in the
calibrator drawing excessive current.
(The calibrator rovides am lification, common-mode rejection and
controls the LCD Dis lay).
The calibrator is designed for 0.5 to 4.0 mV/V bridge sensitivity
range. A ZERO POT and SPAN POT is rovided for calibration.
See Section 4 for more details.
1.3 Features
•Portable, hand held indicator for bridge ty e transducers
•9 Volt battery owered
•Scalable dis lay with dummy zero
•Built-in transducer excitation
• Track/ eak modes available
•Selectable decimal oint
•Low battery indication
•Blanking overrange

SAFETY CONSIDERATIONS
2
3
This device is marked with the international Caution
symbol. It is im ortant to read this manual before
installing or commissioning this device as it contains
im ortant information relating to Safety and EMC
(Electromagnetic Com atibility).
Unpacking & Inspection
Un ack the instrument and ins ect for obvious shi ing
damage. Do not attem t to o erate the unit if damage is found.
• Always disconnect ower before changing signal and
ower connections.
• Do not use this instrument on a work bench without its
case for safety reasons.
• Do not o erate this instrument in flammable or
ex losive atmos heres.
• Do not ex ose this instrument to rain or moisture.
• Allow for adequate ventilation to ensure instrument
does not exceed o erating tem erature rating.
• Use electrical wires with adequate size to handle
mechanical strain and ower requirements. Install
without ex osing bare wire outside the connector to
minimize electrical shock hazards.
EM onsiderations
• Whenever EMC is an issue, always use shielded
cables.
• Never run signal and ower wires in the same conduit.
• Use signal wire connections with twisted- air cables.
• Install Ferrite Bead(s) on signal wires close to the
instrument if EMC roblems ersist.

INSTALLATION AND OPERATION
3
4
3.1 Front of the Meter
Figure 3.1 — Front Panel
-IN +IN -EX
ON SHUNT PEAK
OFF CAL TRACK
+EX
BLACK REDBLACK RED
LO
BAT
ZERO SPAN
LCD DISPLAY
TERMINALS
POTENTIOMETERS
SWITCHES

INSTALLATION AND OPERATION
3
5
DES RIPTION
ON/OFF Switch
— controls ower flow from the battery to all
circuits.
SHUNT AL Switch
— laces a known resistor (59 K Ohm)
across the transducer, so that a known out ut (half scale, 1000
count a roximately) is seen, and is used to self-calibrate the
instrument.
Note: a count of 1000 is applicable only to a 350 Ohm bridge.
PEAK/TRA K Switch
— selects the mode of o eration of the
instrument. In the PEAK mode, the instrument will retain the
reading of the most ositive value detected during the o eration. In
the TRACK mode, the instrument will continuously follow the
variations of the in ut signal. To reset the eak (when in eak
mode), merely switch the instrument to the track mode.
ZERO Potentiometer
— is used to obtain a zero indication,
thus com ensating for drifts and electrical offsets that may exist in
the transducer or the instrument.
SPAN Potentiometer - adjusts the fine gain of the am lifier. It
is used to assure ro er gain-level setting er given transducer.
L D Display
— a ears through a window on the front
anel. The LO-BATT indication a ears at the u er left side of the
dis lay and indicates when the 9 Volt battery has dro ed below
5.2 Volts.
TERMINALS
— Above the front anel are four connectors used
to ower and read from the transducer. The front- anel label
describes the function of each terminal.

INSTALLATION AND OPERATION
3
6
3.2 Back of the Meter
Figure 3.2 — Rear View