1587/1577 
Users Manual 
32 
Common Mode Rejection Ratio  
(1 kΩ unbalanced)...........................................>60 dB at dc, 50 or 60 Hz 
Overload Protection ............................................ 1000 V rms or dc, 10
7
 V Hz Max 
DC Voltage Measurement 
Range Resolution 
Accuracy 1587 and 1587T 
[1] 
±(% of Rdg + Digits) 
Accuracy 1577
 [1] 
±(% of Rdg + Digits) 
6.000 V dc  0.001 V 
±(0.09 % + 2)  ±(0.2 % + 2) 
60.00 V dc  0.01 V 
±(0.09 % + 2)  ±(0.2 % + 2) 
600.0 V dc  0.1 V 
±(0.09 % + 2)  ±(0.2 % + 2) 
1000 V dc  1 V 
±(0.09 % + 2)  ±(0.2 % + 2) 
[1]  Accuracies apply to ± 100% of range. 
Input Impedance .................................................10 MΩ (nominal), < 100 pF 
Normal Mode Rejection Ratio ............................. >60 dB @ 50 Hz or 60 Hz 
Common Mode Rejection Ratio ..........................>120 dB @ dc, 50 Hz or 60 Hz (1 k unbalance) 
Overload Protection ............................................ 1000 V rms or dc 
DC Millivolts Measurement 
Range Resolution 
Accuracy 1587 and 1587T
±(% of Rdg + Digits) 
Accuracy 1577 
±(% of Rdg + Digits) 
600.0 mV dc  0.1 mV 
±(0.1 % + 1)  ±(0.2 % + 1)