Keysight Technologies N2142A, N2140A Quick Start Manual
Quick Start Guide
© Keysight Technologies 2018
1900 Garden of the Gods Road
Colorado Springs, CO 80907 USA
N2140-92002, November 2018,
Available in electronic format only
If your probe requires cleaning, disconnect
it from the instrument and clean it with
mild detergent and water. Make sure the
probe is completely dry before connecting
it to the instrument.
Safety and Regulatory Information
The CE mark is a registered trademark of the
European Community. ISM GRP 1-A denotes the
instrument is an Industrial Scientific and Medical
Group 1 Class A product. ICES/NMB-001
indicates product compliance with the Canadian
Interference-Causing Equipment Standard.
IEC Measurement category II is for measurements
performed on circuits directly connected to the
low voltage installation. Example. Household
appliances portable tools, and similar equipment.
CSA is the Canadian certification mark to
demonstrate compliance with the Safety requirements.
CAT II
Indoor Use Only. Do not operate in wet / damp /
explosive environments. Keep product surfaces
dry and clean.
To avoid personal injury or to prevent fire or
damage to this product or products connected to
it, review and comply with the following safety
precautions. Be aware that if you use this product
in a manner not specified, the protection
that the product provides may be impaired.
The probe cable is a sensitive part of the probe
and, therefore, you should be careful not to
damage it through excessive bending or pulling.
Avoid any mechanical shocks to the product to
guarantee accurate performance and protection.
Some of the probe tips / accessories are very
sharp. You should handle these with care to
avoid personal injury.
Use only Grounded instruments. Do not connect
the probe’s ground lead to a potential other than
earth ground. Always make sure that the probe
and oscilloscope are grounded properly.
Connect the probe to the oscilloscope and
connect the ground lead to earth ground before
connecting the probe to the circuit under test.
Disconnect the probe input and the probe ground
lead from the circuit under test before
disconnecting the probe from the oscilloscope.
Do not use the probe assembly if the red wear
indicator in the cable has become visible.
Keysight N2140A and N2142A
Passive Probes
1
2
3
4
5
6
7
This symbol indicates the Environmental Protection
Use Period (EPUP) for the product’s toxic
substances for the China RoHS requirements.
Repair and Service
For technical assistance, you can contact your local Keysight
Technologies Call Center.
> In the Americas, call 1 (800) 829- 4444
> In other regions, visit http://www.keysight.com/find/assist
For all repair or service needs, we recommend sending the probe
to a Keysight authorized service center.
Visit http://www.keysight.com/find/assist to find a service
location near you.
Do not install substitute parts or perform any
unauthorized modification to the product. Only
Keysight authorized service centers should
perform repair/maintenance on the product.
Before returning the probe for service, you must first call the
Call Center at 1 (800) 829- 4444.
*N2140-92002*
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.
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