Datasheet

Page 17
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External low noise filter supplemental characteristics
The Keysight B2961A/B2962A supports dedicated external low-noise filters; they are available as an option or as an accessory.
They connect to the banana jack outputs of each Keysight B2961A/B2962A channel.
High Current Ultra Low Noise Filter (N1294A-020)
Maximum output range 21 V / 500 mA (DC)
Output connector BNC
Output/residual resistance 10 Ω nominal (2-wire), 0.3 Ω nominal (4-wire. 4-wire connected inside of filter)
Small signal bandwidth 23 Hz nominal (2-wire), 8 Hz nominal (4-wire)
Noise
Voltage source 0.1 to 10 Hz Same as voltage specification
10 to 20 MHz 10 μVrms, 1nVrms√Hz at 10 kHz (20 V / 100 mA range, 50 Ω load)
Current source
0.1 to 10 Hz: Same as current specification
10 to 1 MHz 8 μArms (20 V / 1 A range, 2 Ω load)
Settling time
Voltage source
1
80 ms (2-wire), 140 ms (4-wire)
Current source
2
11 ms (2-wire), 150 ms (4-wire)
1. Time required to reach within 0.1 % of final value at open load condition. Step is 10 % to 90 % range. At 20 V range, 500 mA limit/1 A range
2. Time required to reach within 0.1 % of final value at short condition. Step is 10 % to 90 % range. At 500 mA (1 A) range, 20 V limit / 20V range
Load transient recovery time: Time to recover to within the settling band following a load change.
250 mA current change
1
Settling band ± 20 mV
Time 50 ms (2-wire), 85 ms (4-wire)
1. At a load change to change the flowing current from +10 mA to +260 mA, 10 V voltage force, 20 V range, 500 mA limit.
Supported
ranges
Voltage 200 mV to 200 V ranges (21 V maximum)
Current 1 mA to 1 A ranges (500 mA maximum)
Maximum capacitive load 50 μF (for 4-wire)
Dimensions
41 mm H x 58.2 mm W x 141.5 mm D (When the filter is inserted to the output connector of B2961A/
B2962A, the depth is 126.5 mm.)
Weight 0.3 kg
Note:
– The 10 A pulse range and programmable output resistance capability are not supported by external filters.
– For the current output, only DC is supported when using with external filters.
– The current measurement data monitored by the built-in voltage/current monitor can be influenced by the charge and discharge current of the capacitance inside of the filters.