Datasheet

Page 5
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Best-in-Class Noise Performance (10 μVrms) Unlocks the True Characteristics of
Your Devices and Samples
Three optional filters available for different
test needs
For applications requiring ultra-low noise performance, the
Keysight B2961A/B2962A supports three external filter options.
This provides you with the flexibility to select the noise filter
price/performance point that best meets your needs. The low
noise filter (LNF) provides the same level of RMS noise as linear
regulator-based power supplies and sources, while the high current
ultra low noise filter (HC-ULNF) and the ultra low noise filter
(ULNF) reduces noise to an impressive 10 μVrms. See Figure 4.
HC-ULNF and ULNF provide unprecedented low-
noise performance (10 μVrms and 1 nVrms/√Hz at
10 kHz) in a low-cost bench-top instrument
As shown in Figure 5 both HC-ULNF and ULNF reduce the
voltage noise of the Keysight B2961A/B2962A to 10 μVrms in the
frequency range of 10 Hz – 20 MHz. The differences between
HC-ULNF and ULNF are voltage and current coverage. HC-ULNF
allow it to source up to 21 V and 500mA, and ULNF allowing up to
42 V and 105 mA. This outstanding low noise performance can be
used to evaluate noise-sensitive devices and circuits such as ADC/
DAC as well as many other types of analog and RF ICs. In addition,
see Figure 6. the HC-ULNF and ULNF minimizes the noise density
to 1 nVrms/√Hz at 10 kHz, which is required for the phase noise
evaluation of oscillator circuits such as VCOs, crystal oscillators,
etc. There are two user-selectable output impedance settings,
2-wire (50 Ω) and 4-wire (low impedance close to zero), to provide
optimal flexibility when characterizing your devices and samples.
LNF supports full 210 V and 3 A bipolar output
range
The LNF supports the B2961A/B2962A’s wide bipolar voltage
and current ranges (up to 210 V/3 A) while providing noise levels
comparable to those of linear power supplies. In addition, when
using the LNF you can still make 4-wire (Kelvin) measurements
to eliminate residual cable resistance effects. For applications
requiring a moderate level of low-noise performance, the
LNF provides a cost-effective means to achieve low-noise
sourcing capability for a modest price.
Keysight B2961A/B2962A with
High Current Ultra Low Noise Filter
/Ultra Low Noise Filter
Keysight B2961A/B2962A
with Low Noise Filter
Keysight B2961A/B2962A
Conventional
Switching DC Source
Conventional
Linear DC Source
1 μVrms 10 μVrms 100 μVrms 1 mVrms 10 mVrms
(Measurement conditions: 20 MHz bandwidth, Time domain)
Voltage Noise
Extremely
Low Noise
Figure 4. Optional external noise filters can meet your most stringent noise
requirements
Figure 5. HC-ULNF and ULNF dramatically reduce output noise
Figure 6. HC-ULNF and ULNF provide excellent noise density performance
High Current
Ultra Low Noise Filter
(option)
Ultra Low Noise Filter
(option)
Low Noise Filter
(option)