product manual 09.
Introduction: Length comparators measure length changes of hardened cement paste, mortar and concrete prismatic specimens. Indicators are mounted on a sturdy upright support attached to a solid triangular base. All units include an invar reference bar and stationary and movable anvils designed to fit H-3260 gauge studs, which are cast into test specimens. Humboldt Length Comparators comply with ASTM C151, C157, C227, C311, C341, C342, C452, C490, C596; AASHTO M210, T107, T160.
With the test bar in place between the terminals, set the large hand on the outer scale and the hand on the lower small scale (0.010" movement) on “0”. The upper small scale (0.100" movement) should be set on “2”. If adjustment is necessary, loosen the hex locking nut on the terminal elevating screw at the base and adjust the height of the terminal until the hand on the upper small scale (0.100" movement) is on “2”. Hold base terminal in place and tighten lock nut.
Reading Instructions for H-3250.3 Dial Gauge figure 1 The gauge shown above has a total range of .400". This is indicated by the upper small scale, which goes to 4. The gauge has a accuracy of .0001", which is measured on the large outer scale. Each gradation of the outer scale is equal to .0001" One full revolution of the gauge’s large hand on the outer scale is equal to .010" One full revolution of the hand on the small, lower scale is equal to .
Operation of Digital (Electrical) Indicator This dual power indicator uses either internal batteries or an external AC Adapter for operating power. The standard lithium batteries are Manganese Dioxide Chemistry, listed under IEC # CR2450. A standard 2.5mm audio jack is provided for use by the 9 VDC AC adapter; center pin is "+" (positive).
Basic Operating Instructions Please refer to figure 2 for the instructions below: ON/OFF: To turn Indicator On: Press ON/clr and release when clr appears. To turn Indicator Off: Press and Release OFF CLEAR: To Clear Display to zero: Press and Release On/clr HOLD: To Turn Max. Hold On/Off: Press and Release HOLD INCH/MILLIMETER: To change from inch to millimeter, or millimeter to inch: Press and hold 2ND until 2nd appears on bottom of display and then release. Press and release within 5 seconds.
TOTAL RESET: To clear all settings and return to factory set defaults: Press and hold 2ND until 2nd appears on bottom display and then release. Press and release ON/clr within 3 seconds Press and release CHNG within 3 seconds Internal Memory Digital indicators include internal non-volatile memory to store all factory default and user settings. When the indicator is turned on, user settings and preset numbers will be the same as when the indicator was turned off.
Replacement Components Description Model Invar Reference Bar for use with H-3250 and 10" (254mm) specimens H-3249A Invar Reference Bar for use with H-3248 and 16" (254mm) specimens H-3249A.16 Dial Indicator Digital Indicator Anvil with collar (one each) H-3250.3 H-3250.3D H-3250.4 Anvil only H-3250.4.4 Collar only H-3250.4.3 Elevating Screw, nut collar & anvil assembly H-3250.7 Adapter for 5" specimens H-3250.
Humboldt Mfg. Co. 875 Tollgate Road Elgin, Illinois 60123 U.S.A. Testing Equipment for U.S.A. Toll Free: 1.800.544.7220 Voice: 1.708.456.6300 Fax: 1.708.456.0137 Email: hmc@humboldtmfg.com Construction Materials HUMBOLDT www.humboldtmfg.
