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

INSTALLATION AND OPERATION
3
7
3.3 Factory Setting
The calibrator is factory configured to:
•1XXX.0 decimal oint location
•No dummy zero
•2.5 Volt Transducer excitation
•3 mV/V sensitivity
If any of the revious characteristics do not suit
your a lication, follow ste s in Section 4 of this
manual to reconfigure to your needs.
3.4 Battery Installation or Replacement
3.4.1 Turn off the calibrator.
3.4.2 Remove the battery com artment door located on
the rear of the unit, sliding the door in the direction
of the arrow.
3.4.3 Remove the battery from the com artment and
carefully remove it from the battery cli . Do not ull
on the wires on either end.
3.4.4 Attach a new battery to the battery cli observing
olarity and lace the battery back into its recess in
the case.
3.4.5 Re lace the battery com artment door.
If you see (LO-BAT) in the u er left of the LCD,
the battery voltage is 5.2 Volts or less. It is time to
re lace the battery.

INSTALLATION AND OPERATION
3
8
3.5 Transducer Hookup
Connect the transducer to the calibrator using the binding
ost connectors shown in Figure 3.1. Observe ro er color
coding as shown on the Transducer Information Sheet
rovided with your transducer. Allow the transducer to warm
u for a few minutes, to stabilize the drift.

CALIBRATION & GAIN SELECTION
4
9
ALIBRATION, GAIN SELE TION AND ADJUSTMENTS
4.1 ZERO ALIBRATION
Close a ro riate switches to obtain desired gain.
See Table 4.1 and 4.2 for ro er selection. Gain
selection is the initial ste for ZERO calibration. This
also rovides course SPAN calibration as well.
Figure 4.1 — Switches & Jumper Locations
R4, R5 Not installed
R4 R5
V
U
T
S
R
Q
S3
1 2 3 4 5 6 7 8 9
GAIN
S1
CB
R7
S8 S7
A
SOLDERSWITCH
R29
R28
1 2 3 4 5 6 7 8 9
OFFSET
S2
USED FOR
FACTORY
CALIBRATION
JUMPER FU CTIO
Test Segment
DUMMY ZERO
1XXX.0
1XX.X0
1X.XX0
1.XXX0
V
U
T
S
R
Q
R7 SMT Not installed
Not installed
DISPLAY
BOARD
MAIN
BOARD

CALIBRATION & GAIN SELECTION
4
10
Table 4.1
GAIN RESISTOR SELE TION FOR 1.24 VOLTS EX ITATION VOLTAGE
(C=CLOSE / O=OPEN)
FOR 1.24V EXCITATION S1-8 CLOSED.
SENSITIVITY S8 S1-7 S1-6 S1-5 S1-4 S1-3 S1-2 S1-1
(mV/V)
0.45 to 0.49 C C C C C C C C
0.50 to 0.54 C C C C O C C O
0.55 to 0.59 C C C O O O C O
0.60 to 0.65 C C O C O O O O
0.66 to 0.72 C O C C O C C O
0.73 to 0.79 C O O C O C C C
0.80 to 0.87 C O O C C O O O
0.88 to 0.96 C O O O C O O O
0.97 to 1.05 O C C C C O O C
1.06 to 1.16 O C C O C O C O
1.17 to 1.27 O C O C C O C O
1.28 to 1.40 O C O O O C C C
1.41 to 1.54 O C O O O O C C
1.55 to 1.70 O C O O O O C O
1.71 to 1.87 O O C C O C C C
1.88 to 2.06 O O C C C O O C
2.07 to 2.27 O O O C C C C C
2.28 to 2.49 O O C O C O C O
2.50 to 2.74 O O O C C C O C
2.75 to 3.02 O O C C O O O O
3.03 to 3.32 O O C O O C O O
3.33 to 3.65 O O O O C O C C
3.66 to 4.02 O O O O O C C C
4.03 to 4.42 O O O C O O C O
4.43 O O O O C C O O

CALIBRATION & GAIN SELECTION
4
11
Table 4.2
GAIN RESISTOR SELE TION FOR 2.50 VOLTS EX ITATION VOLTAGE
(C=CLOSE / O=OPEN)
FOR 2.50V EXCITATION S1-9 IS CLOSED.
See NOTES 1, 2, and 3 at end of section.
SENSITIVITY S8 S1-7 S1-6 S1-5 S1-4 S1-3 S1-2 S1-1
(mV/V)
0.45 to 0.49 O C C C C C O C
0.50 to 0.54 O C C O C O C C
0.55 to 0.59 O C C O O C C O
0.60 to 0.65 O C C O O C O O
0.66 to 0.72 O C C O O O O O
0.73 to 0.79 O C O O O C O C
0.80 to 0.87 O C O O O C O O
0.88 to 0.96 O O C O C C C C
0.97 to 1.05 O O C C O O C C
1.06 to 1.16 O O C C C O O O
1.17 to 1.27 O O C O C C O O
1.28 to 1.40 O O C O O C O C
1.41 to 1.54 O O C O C O O O
1.55 to 1.70 O O O C O C C O
1.71 to 1.87 O O O O C C O C
1.88 to 2.06 O O O C C O O O
2.07 to 2.27 O O O O C O C O
2.28 to 2.49 O O O O C C O O
2.50 to 2.74 O O O O O O C C
2.75 to 3.02 O O O O O C O C
3.03 to 3.32 O O O C O O O O
3.33 to 3.65 O O O O C O O O
3.66 to 4.02 O O O O O O C O
4.03 to 4.42 O O O O O C O O
4.43 O O O O O O O C

CALIBRATION & GAIN SELECTION
4
12
4.1.1 A ly zero signal.
4.1.2 Using Table 4.3, select and Close the a ro riate
switches. (if any)
Table 4.3
ZERO RESISTOR SELE TION
4.1.3 This will rovide coarse adjustment.
4.1.4 Use ZERO POT to fine tune to a dis lay count of 000.
FUN TION
SWIT H ZERO OFFSET DISPLAY OUNT DISPLAY OUNT
VOLTAGE (1.24 VOLT EX .) (2.50 VOLT EX .)
S2-1 -40 mV -757 (±3) -729 (±3)
S2-2 -20 mV -373 (±3) -358 (±3)
S2-3 -10 mV -184 (±3) -177 (±3)
S2-4 -5 mV -90 (±3) -86 (±3)
S2-5 +5 mV +92 (±3) +87 (±3)
S2-6 +10 mV +186 (±3) +177 (±3)
S2-7 +20 mV +373 (±3) +357 (±3)
S2-8 +40 mV +756 (±3) +726 (±3)
S2-9 +80 mV +1543 (±3) +1478 (±3)
S2-None 0 mV 0 (±3) 0 (±3)

CALIBRATION & GAIN SELECTION
4
13
4.2 SPAN ALIBRATION
4.2.1 Adjust ZERO POT to a 000 dis lay count as
suggested in section 4.1.
4.2.2 A ly full scale signal er given strain gage. For
3mV/V and 1.24 V excitation, a ly 3.720 mV at
± SIGNAL in ut.
4.2.3 Use SPAN POT to fine tune to a 1999 dis lay count.
4.3 After roceeding through the ste s above, a ly a
ZERO signal again and check for a 000 dis lay count.
If the ZERO has shifted, re eat the ste s for ZERO
and SPAN calibration.
Table 4.4
S3 JUMPER SWIT H DES RIPTION
Table 4.5
SOLDER SWIT H DES RIPTION
JUMPER SWIT H FUN TION
SELE TED DE IMAL POINT POSITION
V TEST SEGMENT
U DUMMY ZERO
T 1XXX.0
S 1XX.X0
R 1X.XX0
Q 1.XXX0
SOLDER SWIT H FUN TION
A Out ut is connected to SPAN POT. See NOTE 4.
B Gain Resistor R6 (750 Ohm) is selected.
See Table 4.1 and 4.2.
C Gain Resistor R7 (OPEN) is selected.
Default OPEN. See NOTE 5.

CALIBRATION & GAIN SELECTION
4
14
1The sensitivities increase in 10% increments. The SPAN
POT range is ±10% which should cover the entire sensitivity
range from 0.5 to 4.0 mV/V. Two extra through-hole resistor
locations R4, R5 and one surface mount resistor, R7 are
available for covering any sensitivity value not covered by
resistors in the tables above. (See Figure 4.1).
2The required through hole resistor value can be
calculated by using the following formulas:
R-gain (Gain setting resistor) = 60,000/(Gain-4) where
Gain (Design gain) = V-out/(V-sensitivity x V-excitation)
Units are in Volts and Ohms.
3The formulas above will give you the correct out ut when
the SPAN POT is connected to the circuit. With the SPAN
POT in the circuit, it will give you twice the desired out ut.
Therefore V-out equal to half the required out ut should
be used. Exam les are shown below:
Example: V-out = 100 mV (a V-out of 100mV will give
you an actual out ut of 200mV) (1999
counts on the LCD Dis lay)
V-sensitivity = 3 mV/V
V-excitation = 1.24 Volts
Gain = 100 mV/(3 mV/V x 1.24) = 26.9
R-gain = 60,000/(26.9-4) = 2.62 K Ohms
4For SPAN POT to be connected and the out ut
adjustable, solder switch "A" needs to be O en.
5R4, R5 can be any through-hole resistor value as
required.
R7 can be any surface mount resistor value as required.

CUSTOMIZED SCALING PROCEDURE
5
15
5.1 CUSTOM SCALI G PROCEDURE
Use this rocedure if you desire to scale your Strain Guage
Indicator with other than the standard default scaling of 1999
counts equaling a full-scale reading.
1Determine the full-scale reading you desire in terms of counts.
This must be between 0 and 1999 counts.
Example: You desire a full-scale reading of 500 counts to
corres ond to an actual reading of 50.0 in/lbs.
2Divide the number of counts determined in ste 1 by 10 to
obtain the number of mV required to achieve the desired
counts.
Example:500 counts = 50 mV
10
3Divide the number of mV obtained in ste 2 by 2.
Example: 50 mV = 25 mV
2
4Determine the full-scale out ut of your device (load cell, strain
gage, etc.) in terms of mV.
Example: You have a torque cell with a full-scale out ut
sensitivity of 2.2249 mV/V. Multi ly this value by the excitation
voltage you have selected. (e.g. 1.24V or 2.50V)
2.2249 mV/V x 1.24V = 2.7588 mV
5Divide the result of ste 3 by the result of ste 4.
Example: 25 mV = 9.06
2.7588
(This value is the am lifier gain that is necessary to give you
the full-scale reading you desire.)

CUSTOMIZED SCALING PROCEDURE
5
16
6Look u the gain value calculated in ste 5 and find the
closest gain value in Table 5.1. (If the value of gain required is
not contained in Table 5.1, ski to ste 14)
7Read across the table to find the gain desired and the gain
switch settings necessary to give you that value.
Table 5.1 ( artial)
Example: S1-1 S1-2 S1-3 S1-4 S1-5 S1-6 S1-7 S8 GAIN
CO OOOOOO9
8O en u the Indicator case by removing the four screws which
hold the rear cover in lace. (see Figure 3.2)
9Set the gain resistor switches to the ositions indicated in ste 7.
(o en is u , and closed is down)
10 Select the decimal oint location (if desired) by using the
ush-on jum ers “Q” through “T” on the dis lay circuit board.
Also select the dummy zero (if desired) by installing the
ush-on jum er “U” on the dis lay circuit board.
11 Close the Indicator case by installing the four screws removed in
ste 8.
12 Connect your device to the Indicator terminals.
13 Adjust the ZERO and SPAN ots on the Indicator as
necessary to obtain the exact reading you desire.