N1419A Datasheet, PDF (5/16 Pages) Keysight Technologies – Femto/Picoammeter and Electrometer/High Resistance Meter

05 | Keysight | B2980A Series Femto/Picoammeter and Electrometer/High Resistance Meter - Data Sheet
In contrast the B2980A’s real-time and auto-scalable histogram display capability
continuously updates the mean and sigma, enabling you to debug your measurement
setup instantly without the need for any post-measurement data crunching. The
histogram can be displayed in the Meter View, allowing you to compare accumulated
data on the histogram with real-time numeric data. Note: The maximum number of data
points supported by the histogram is 100,000.
100 BINS
Histogram View
On Meter View
40 BINS
20 BINS
Available BINS: 10, 20, 40 and 100
Challenge 3: Eliminating noise from
low-level measurements is difficult and
often requires extensive measurement
expertise.
10 BINS
Solution 3. The B2980A series’ battery operated models eliminate
power line noise and enhance low noise measurement performance.
AC power line noise strongly impacts sensitive measurements. While integrating
over one or more PLCs can minimize AC power line noise effects, even the B2980A’s
excellent noise performance cannot eliminate 100% of this noise unless the instrument
is completely isolated. Therefore, both the Femto/Picoammeter and Electrometer have
available battery operated versions that enable you to make power-line-noise-free
measurements. The two battery models can function for 7 hours (B2983A) or 5 hours
(B2987A) under normal operating conditions, and they also automatically save your
measured data and measurement setup information if the battery level goes below 5%.
Of course, besides eliminating noise the battery models provide the added benefit of
portability allowing you to use them anywhere you want.
How much lower is the
B2980A series’ noise floor?
Even when operating in AC mode with
0.1 PLC integration time, the B2980A
series’ advanced design provides
current measurement performance
that is much better than conventional
picoammeters and electrometers. The
graph shown below compares current
measurement noise levels under
identical measurement conditions.
As can be seen the B2980A series
can make both lower noise and faster
measurements, which reduces the
trade-offs that normally need to be
made between these two goals.
Normalized 2 nA range RMS noise
0.1 PLC, 3 m triaxial cable
18
16
14
12
10
8
6
4
2
0
B2980A
A: High-end electrometer
B: Picoammeter with V source
C: Digital electrometer (3 nA range)
A
B
C
What makes Keysight
triaxial cables superior?
Triaxial cables, which are available
from a variety of sources, are required
for low-current measurement applica-
tions. Keysight triaxial cables employ
a semiconductor layer between the
insulator and inner jacket, which
minimizes the triboelectricity gener-
ated by friction at these boundaries.
The net result is that Keysight triaxial
cables are largely unaffected by
cable vibration, which enables more
accurate and stable measurements.
All B2980A products come with a
1.5 meter version of this triaxial cable.
Conductor
Inner jacket Outer jacket
The battery is automatically charged
when connected to AC power
Battery charge
staus indicator
Battery
operation
indicator
Insulation
Inner shield
Outer shield
Off-the-shelf triaxial cable
Semiconductor Inner jacket Outer jacket
Conductor ^layer
Insulation
Inner shield
Outer shield
Keysight standard triaxial cable