Agilent 4155C/4156C User’s Guide Vol.1, Edition 11 8-9
Specifications
Hardware
VMU (Voltage Monitor Unit) Specifications
• Voltage Range, Resolution, and Accuracy
Grounded measurement mode
Differential measurement mode
• VMU supplemental information
Input impedance ≥ 1 GΩ
Input leakage current
≤ 500 pA (at 0 V)
Measurement noise typical 0.01 % of range (p-p). when the integration
time is 10 PLC.
Differential mode
measurement noise typical 0.005 % of range (p-p). when the integration
time is short.
Voltage Range Meas. Reso.
Meas. Accuracy
a
a. Accuracy: ± (% of reading value + offset value).
±
2 V 2 μV ± (0.02 % + 200 μV)
± 20 V 20 μV ± (0.02 % + 1 mV)
Differential
Voltage
Range
Meas.
Reso.
Meas. Accuracy
a
a. Accuracy: ± (% of reading value + offset value + common mode error).
Max.
Common
Mode
Voltage
± 0.2 V 0.2 μV
± (0.03 % + 10 μV + 0.3 μV × Vi
b
)
b. Vi is the input voltage of VMU2 in volts.
± 20 V
± 2 V 2 μV
± (0.02 % + 100 μV + 3 μV × Vi
b
)
± 20 V
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