The Keysight N2140A 200 MHz and N2142A 75 MHz passive
probes are high impedance probes with switchable attenuation
ratio (1:1 and 10:1). These are compatible with the Keysight
InfiniiVision x-series oscilloscopes or similar oscilloscopes with
1 Mohm BNC input.
Table 3 - Physical & Environmental Characteristics
Characteristic
Value
Probe Body
Cable Length
Weight
95mm
1200mm
55g
Table 2 - Electrical Characteristics
Characteristic
Value
Attenuation Ratio
Input Capacitance
Compensation range
(when terminated
into 1 Mohm)
1:1 / 10:1
1:1 - 100pf
15pf - 30pf
Input Resistance
Maximum Input
Voltage
1:1 - 150V rms CAT II
1:1 - 1MΩ
Temperature
Humidity
Altitude
The BNC connector of these probes has a
pin hole without a pin. This is as per the
design and does not indicate any damage
or fault in the probe.
These probes have been designed and calibrated for use
with instruments having an input impedance of 1M Ω
paralleled by 20pF. However, these may be recalibrated for
use with instruments having an input capacitance of
15 to 30pF.
Adjusting Probes for Low-Frequency (LF) Compensation
The probe should be adjusted for LF compensation when it is
connected to an oscilloscope input for the first time. LF
compensation matches the probe cable capacitance to the
oscilloscope input capacitance. This matching assures good
amplitude accuracy from DC to the upper bandwidth limit
frequencies. A poorly compensated probe clearly influences
the overall system performance (probe and oscilloscope)
and introduces measurement errors resulting in inaccurate
readings and distorted waveforms.
10:1 - 15pf
10:1 - 10MΩ
Table 1 - Probe and its Supplied Accessories
ID Part
Quantity
For N2140A
For N2142A
Hook Tip
Ground Spring
Ground Lead
Adjustment Tool
Protective Cap
Channel
Identification rings
2
2
2
2
-
2
1
1
1
1
16 rings total
(4 rings of each color)
These accessories are provided in the N2141A kit for the
N2140A probe and the N2143A kit for the N2142A probe.
Undercompensated
Overcompensated
Optimum
10:1 - 300V rms CAT II
3,000 m (9,842 ft) (Operating)
12200 m (40,026 ft) (Non-operating)
Bandwidth
For N2140A
1:1 - 6 MHz
10:1 - 200 MHz
For N2142A
1:1 - 6 MHz
10:1 - 75 MHz
5% to 90% RH up to 30 °C (Operating)
5% to 65% RH above 30 °C up to 55 °C
(Non-operating)
-10 °C to +55 °C (Operating)
-40 °C to +70 °C (Non-operating)
Passive probe
2
2
BNC
Connector
Pin hole
without
a pin
Current Rating
(DC, 1:1, & maximum voltage)
0.15mA
To perform LF compensation:
1 Connect the probe to the oscilloscope’s front-panel
calibration output (a square wave label is usually seen near
this output).
2 Use the supplied adjustment tool to adjust the LF
compensation to an optimum square wave response as
shown in the figure below.
For optimal probe compensation:
- Allow the oscilloscope (with the probe connected) to warm
up for at least 30 minutes.
- Repeat the compensation steps if the ambient temperature
in the area in which the oscilloscope is being used changes
by more than 5 degrees C.
- Do NOT push down on the adjustment screw when engaging
or turning this screw.
To securely engage the hook tip with the
probe, ensure that you push the hook tip
onto the probe completely until it stops
and then release it.
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