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Model 187 & 189
Users Manual
7-12
Input Characteristics
Function Input Impedance (Nominal)
Volts, mV 10 MΩ, < 100 pF
Common Mode Rejection Ratio Normal Mode Rejection
DC Volts, mV >100 dB at dc, 50 Hz or 60 Hz ±0.1% >90 dB at 50 Hz or 60 Hz ± 0.1%
AC Volts, mV > 90 dB dc to 60 Hz
Full-Scale Voltage
Open Circuit Test Voltage To 5 MΩ 30 MΩ + nS
Ohms < 5 V 500 mV 3.1 V
Diode Test < 5 V 3.1000 V
Typical Short-Circuit Current
500 Ω 5 kΩ 50 kΩ 500 kΩ 5 MΩ 30 MΩ
Ohms 1 mA 100 µA 10 µA1 µA0.1 µA0.1 µA
Diode Test 1 mA typical