1587 FC/1587/1577 
Users Manual 
28 
5.  Press and release  to start the test. The secondary 
display shows the test voltage applied to the circuit 
under test. The high voltage symbol (Z) along with the 
primary display show the resistance in MΩ or GΩ. The 
T icon shows on the lower portion of the display until 
the test is finished. 
When the test is completed, the PI or DAR value is 
displayed on the primary display. The circuit under test will 
automatically be discharged through the Tester. If either 
value used to calculate PI or DAR was greater than the 
maximum display range, or the 1-minute value was greater 
than 5000 Mo, the primary display will show Err: 
•  When resistance is higher than the maximum display 
range, the Tester displays the > symbol and the 
maximum resistance for the range. 
•  To interrupt a PI or DAR test before it is completed, 
momentarily press . When you release , 
the circuit under test will automatically be discharged 
through the Tester. 
Frequency (all 1587 Models) 
The Meter measures the frequency of a voltage or current 
signal by counting the number of times the signal crosses 
a threshold level each second. To measure frequency, set 
up the Meter as shown in Figure 10 and follow the steps 
below. 
1.  Connect the Meter to the signal source. 
2.  Turn the rotary switch to the 
B, C, or c position. 
3. In the 
c position press the blue button to select dc if 
needed. 
4. Press the 
 button. 
5. Press the 
 button or change the rotary switch 
position to end this function. 
 
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