MODEL 1300【PDF 1/3 页】STRAIN GAGE INSTALLATION TESTER

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? Model?1300

Micro-Measurements

Gage?Installation?Tester

FEATURES

? A compact, battery-powered instrument used to

verify the electrical quality of a strain gage installation

BEFORE it is placed in service

? Reads with the push of a button—no warm-up

? Reads insulation resistance (leakage) to 20,000

megohms with 15 VDC

? Measures deviation of installed gage resistance from

precise standards to a resolution of 0.02%

? Ohmmeter scale for troubleshooting questionable

installations

? Verifies the complete gage circuit, including leadwires

DESCRIPTION

Two of the most important measurements used to verify

the quality of a strain gage installation are insulation

resistance (leakage to ground) and shift in gage

resistance due to installation procedures. While these two

measurements are not a complete guarantee of eventual

proper strain gage performance, any installation that

produces questionable values should not be relied upon

where accuracy of results is necessary.

For example, a voltage difference between the specimen

and strain gage frequently exists. A low insulation

resistance will permit this voltage differential to introduce

extraneous signals during strain measurement.

Several sources of variations in insulation resistance and

shifts in gage resistance are:

? Insulation resistance in excess of 20,000 megohms

should be expected for foil strain gages when installed

under laboratory conditions. A value of 10,000

megohms should be considered minimum. A reading

below this value generally indicates trapped foreign

matter, moisture, residual flux or backing damage due

to soldering, as well as incomplete solvent evaporation

from an overcoating.

? Deterioration of the insulation resistance with time may

be an indication of an improperly coated installation.

? At higher test temperatures, particularly above +300°F

[+150°C], it is normal to expect lesser values. Ten

megohms is considered to be the lower allowable value.

? Shifts in gage resistance during installation should not

normally exceed 0.5% when using room-temperature-

curing adhesives. Resistance shifts greater than 0.5%

generally indicate damage to the gage due to improper

handling or clamping. However, strain gages installed

using elevated-temperature-curing adhesives may

exhibit greater shifts in resistance due to adhesive

lock-up at elevated temperatures (difference in linear

coefficient of thermal expansion between the strain

gage and specimen). These shifts will vary depending

upon the specific cure temperature and materials used.

The shifts should never exceed 2% and should be

uniform within 0.5%.

SPECIFICATIONS

INPUT?CIRCUITS

Gages: Three-wire quarter bridge (120Ω and 350Ω)

and half bridge. Other value quarter bridges using

customer’s reference, at readily accessible panel

terminals.

As?ohmmeter:? Two leads (500Ω and 500 MΩ mid-

scale)

INPUT?LEADS

4-ft [1.2m] 4-conductor AWG #26 [0.4-mm diameter]

twisted Teflon ? -insulated cable supplied (with ground

clip and three tinned leads)

METER

3.5-in size (3.00-in [76-mm] scale length) with mirror

Tracking accuracy ±1% full range

MODE?SWITCH

Five momentary push buttons: battery check,

±5% deviation, ±1% deviation, gage resistance

(ohms), and insulation resistance (megohms)

DEVIATION?MODE

Two ranges, ±1% and ±5%, F.S. (50 graduations

either side of zero)

Accuracy:

1% range: 0.04% Δ R (2 meter graduations)

5% range: 0.2% Δ R (2 meter graduations)

Excitation:? 1.0 VDC per gage

INSULATION?RESISTANCE?MODE

Graduated 5 MΩ to 20,000 MΩ (500 MΩ mid-scale)

Accuracy: 1 scale division

Test?Voltage:? 15 VDC open circuit

www.micro-measurements.com

For technical questions, contact

micro-measurements@vishaypg.com

Document No.: 11301

Revision: 17-May-2011

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