4.b PHASE AND SYMMETRY ADJUSTMENT OF THE
MODEL 3578 AC STRAIN GAGE CONDITIONER
PLEASE NOTE: THIS PROCEDURE APPLIES ONLY TO THE MODEL 3578 AC
STRAIN GAGE CONDITIONER. FOR ALL OTHER CONDITIONERS, YOU MAY
IGNORE THIS MANUAL SECTION.
Before you calibrate your Model 3578 for the first time, you should perform the follow-
ing PHASE AND SYMMETRY ADJUSTMENT procedure. When using the 3578 with a
Lebow 1800 Series Transducer, you should follow the special procedure outlined at
the end of this section.
ONCE SET FOR YOUR TRANSDUCER, THIS ADJUSTMENT NEED NOT BE REPEATED
UNLESS A SIGNIFICANT CHANGE IN CABLE LENGTH OR CAPACITANCE IS
REQUIRED.
1. Make sure your transducer connection is good (see Section 2.a.7). With the 3578
in "run" mode, load the transducer in the positive direction with a convenient
"deadweight" value which is greater than one-half of full scale.
2. Locate the PHASE ADJUSTMENT CONTROL on the rear of the 3578 (see Fig. 20).
Adjust the PHASE control until a maximum reading is obtained on the display.
3. Remove the transducer load.
4. Enter SETUP MODE as explained in Section 3.a.1 and press the
button. If the unit does not now display
continue to press the CAL button until it does.
5. Press the ENTER button. The unit will display "OFSET" (for "ZERO OFFSET"):
4.4
4
SETUP: INSTRUMENT CALIBRATION
4.b PHASE AND SYMMETRY ADJUSTMENT OF THE MODEL 3578
+
+
Symmetry
Adjustment
Control
Phase
Adjustment
Control
Fig. 20 Symmetry and Phase Adjustment Controls for the Model 3578
CAL
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