SECTION I Model 4145A
Table l-2. Reference Data (Sheet 2 of 3)
STIMULUS/MEASUREMENT UNIT (SMU)
Offset Current when operated as a Voltmeter : 6pA + 2pA x Vo/lOO
Offset Voltage when operated as a Current Meter : 1OmV + 0.4Q x IO
Noise Characteristics : (all values typical)
Voltage Source Noise : 0.01% of range (RMS)
Current Source Noise : 0.1% of range+3pA+O.OlpAxCg (RMS)
(Cg : Guard capacitance in pF)
Voltage Monitor : 0.02% of range (peak-to-peak)
Current Monitor : 0.3% of range + 1OpA
(peak-to-peak)
Output Overshoot : (all values typical)
Voltage Source Overshoot : 5mV
Current Source Overshoot : 1% or less
Current Range Switching Transient Noise : (All values typical)
Range Increment :
0.01% of voltage range +lOmV
Range Decrement : When switching into 1OnA or 1nA range, 1OmV + lOO/(lO +
Cx)mV where Cx = load capacitance (pF); when switching into
all other ranges, 10mV.
Guard Capacitance : 5 7OOpF
Guard Potential Offset : 1mV (typical)
Guard Current Induced Potential Error : 1OORxIg (Ig = guard current)
Voltage Sources (Vs)
Output Noise : 6 mVrms (typical)
Voltage Monitors (Vm)
Noise Level : 0.3mVp-p at 2V-range (when Integration time is set to MED or
LONG), 3mVp-p at 20V range.
REFERENCE DATA COMMON TO ALL UNITS
Noise Rejection : (Integration time set to MED or LONG.)
Normal Mode Rejection : L 60dB (typical)
Common Mode Rejection : (all values typical)
Current Source/Measurement : 2 lpA/lV
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