Insulation Multimeter 
  Display 
11 
Display 
Display indicators are shown and described in Table 6. 
Error messages that may appear on the display are 
described in Table 7. 
 Warning 
To prevent possible electric shock or personal 
injury, replace the battery when the low battery 
indicator () shows to prevent incorrect 
measurements. 
Table 6. Display Indicators 
 
 
bav01f.eps 
Model 
1587 FC 
1587 
1587T 
1577 
Indicator Description 
 
Low battery. Time to replace the battery. When  is on, the backlight button is disabled to 
conserve battery life. 1587 FC model: module mode is disabled when the battery is low. 
•  •  •  • 
L 
LOCK 
Indicates a test lock will be applied the next time you press  on the Meter or on the remote 
probe. The test lock acts to hold down the button until you press  or  again. 
•  •  •  • 
P 
/ 
Q 
Less than, minus, or greater than symbols 
•  •  •  • 
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