Model 77 Series IV  
Calibration Information 
10 
LCD Mask
 
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Figure 3. Removing the LCD Mask 
Performance Tests 
  The following performance tests verify the complete operation of the Meter and check the accuracy of 
each Meter function against its specifications. The recommended calibration interval is 12 months. If the 
Meter fails any part of the test, calibration adjustment and/or repair is indicated. 
  In the performance tests, the Meter is referred to as the unit under test (UUT).