Specifications

DC Voltage Noise Specifications *
Observation Period
Range
2-Minute
RMS
Noise
2-Minute
Peak-Peak
Noise
24-Hour
Peak-Peak
Noise
1 mV 1.3 nV
RMS 8 nVpp 12 nVpp
10 mV 1.5 nV
RMS 10 nVpp 14 nVpp
100 mV 10 nV
RMS 65 nVpp 80 nVpp
1 V 100 nV
RMS 650 nVpp 800 nVpp
10 V 450 nV
RMS 3 µVpp 3.7 µVpp
100 V 11
µVRMS 75 µVpp 90 µVpp
* After a 2-hour warm-up, ± 1°C, 6.5 digits (10 PLC) with Analog
Filter Off and Digital Filter Medium (50 reading average). 2-Minute
RMS and 24-hour noise typical. For measurements using 0.02 or
0.2 NPLC, add 800 nV RMS noise.
DC Voltage Noise vs Source Resistance *
Source
Resistance
Noise Analog Filter Digital Filter
0 1.3 nV
RMS Off Med
100 1.7 nV
RMS Off Med
1k 4 nV
RMS Off Med
10k 13 nV
RMS Off Med
100k 41 nV
RMS On Med
1M 90 nV
RMS On Slow
* Typical noise behavior for Ch 1 or Ch 2, after 2 hour warm-up,
6.5 digits (10 PLC), 2 minute observation period on 1 mV range.
For peak-to-peak noise, multiply RMS noise by 6.
MEASUREMENT CHARACTERISTICS
DC Voltage
Measurement Method Continuously Integrating
Multi-slope III A-D Converter
A-D Linearity 0.00008% of reading + 0.00005% of range
Input Resistance
100V (Ch1 only)
1mV through 10V
10 MΩ ± 1%
>10 GΩ, in parallel with <3.6 nF
Input Bias Current
<50 pA at 25°C
Injected Current* <50 nA pp at 50 or 60 Hz
Input Protection 150 V peak any input terminal to
Channel 1 LO, continuous
Channel Isolation Isolation between input channels
>10
10
Ω
Earth Isolation 350 V peak any input terminal to
earth. Impedence from any input
terminal to earth is
>10 GΩ and < 400 pF
Maximum Voltage Channel 1 LO to Channel 2 LO,
150V peak
Resistance
Measurement Method Selectable 4-wire or 2-wire ohms.
Current Source referenced to
Channel 1 LO input
Offset Compensation Used on all ranges except
100 kΩ and 1 MΩ.
Can be turned off if desired
Protection 150V peak
Open Circuit Voltage For Resistance and Low Power
Resistance <14 V. 20 mV, 100 mV,
500 mV selectable clamp
* Injected current is calibrated at the factory. Different line power
configurations will require recalibration.
8
Chapter 8 Specifications
34420A Nano Volt/Micro Ohm Meter
277