Page 1
Keysight U1241B and
U1242B Handheld
Digital Multimeter
Quick Start
Guide
Page 2
Contacting Keysight
CAUTION
WARNING
CAT III
1000 V
CAT IV
600 V
www.keysight.com/find/assist
(worldwide contact information for
repair and service)
Safety and EMC Information
The U1241B and U1242B is
safety-certified in compliance with
IEC/EN 61010-1, IEC/EN
61010-2-030, IEC/EN
61010-2-033, CAN/CSA-C22.2 No.
61010-1, CAN/CSA-C22.2 No.
61010-030, CAN/CSA-C22.2 No.
61010-033, UL Std. No. 61010-1,
UL Std. No. 61010-030 and UL Std.
No. 61010-033.
EMC is designed in compliance
with IEC 61326-1/EN 61326-1,
CISPR11/EN55011 Group 1 Class
A, ICES/NMB-001, and AS/NZS
CISPR 11.
Safety Notices
A CAUTION notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly
performed or adhered to, could
result in damage to the product or
loss of important data. Do not
proceed beyond a CAUTION notice
until the indicated conditions are
fully understood and met.
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
the like that, if not correctly
performed or adhered to, could
result in personal injury or
death. Do not proceed beyond a
WARNING notice until the
indicated conditions are fully
understood and met.
Safety symbols
Earth (ground) terminal
Equipment protected
throughout by double
insulation or reinforced
insulation
Caution, risk of electric
shock
Caution, risk of danger
(refer to this manual for
specific Warning or Caution
information)
Category III 1000 V
overvoltage protection
Category IV 600 V
overvoltage protection
For further safety information details, refer to the
Keysight U1241B and U1242B Handheld Digital Multimeter
User’s and Service Guide.
2 Keysight U1241B and U1242B Quick Start Guide
Page 3
Table of Contents
Keysight U1241B and U1242B Handheld
Digital Multimeter Quick Start Guide . . . . . . 5
Tilt Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Annunciator Display . . . . . . . . . . . . . . . . . . . . . 8
Functions and Features . . . . . . . . . . . . . . . . . . . 9
Keysight U1241B and U1242B Quick Start Guide 3
Page 4
THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.
4 Keysight U1241B and U1242B Quick Start Guide
Page 5
Keysight U1241B and U1242B Handheld
WARNING
Digital Multimeter Quick Start Guide
The following items are included with your
multimeter:
✔ Silicone test leads and 4 mm probes
✔ Four 1.5 V AAA alkaline batteries
✔ Certificate of Calibration
If anything is missing or damaged, please contact
the nearest Keysight Sales Office.
For more detailed information, please refer to the
Keysight U1241B and U1242B Handheld Digital
Multimeter User’s and Service Guide on Keysight
website (www.keysight.com/find/handheld-tools).
Ensure the terminal connections are correct for that
particular measurement selection before starting any
measurement. To avoid damage to the device, do not
exceed the input limit.
Keysight U1241B and U1242B Quick Start Guide 5
Page 6
Annunciator
Keypad
Rotary Switch
Input terminal
U1241B
U1242B
Measurement Functions Input Terminal Overload Protection
Voltage
Diode 1000 V R.M.S
Resistance
Capacitance
Current (μA and mA) µA.mA COM 440 mA/1000 V
Current (A) A COM 11 A/1000 V 30 kA/
Temperature +T1 –T1 1000 V R.M.S
Temperature
(for U1242B)
+T2 –T2 440 mA/1000 V
COM
1000 V R.M.S
< 0.3 A short circuit
current
30 kA/fast-acting fuse
fast-acting fuse
30 kA/fast-acting fuse
6 Keysight U1241B and U1242B Quick Start Guide
Page 7
Tilt Stand
Tilt stand at 60 º
Tilt stand at 30 º
Keysight U1241B and U1242B Quick Start Guide 7
Page 8
Annunciator Display
1
2
3
4
6
7
8
9
10
11 13
14
15
17
18
19
20
21
22
23
5
12
16
No. Descriptions No. Descriptions
1 21-segment analog bar graph
display
2 Capacitor discharge indicator 13 Harmonic Ratio mode
3 Cold junction of ambient
temperature
4 Audible continuity for
resistance and diode function
5
Primary display
6 AC or DC measurement mode 17 Secondary display
7 Auto range 18 Null math function
8 Diode / Audible continuity 19 Thermocouple type for
9 T1, T2 and T1 – T2 temperature
measurements scan
(for U1242B)
10 Data hold 22 Low battery indicator
11 T1, T2* and T1 – T2*
temperature measurements
*T2 temperature measurement and delta (T1 – T2) are only available for U1242B.
8 Keysight U1241B and U1242B Quick Start Guide
12 MINMAX Recording mode
(for U1242B)
14 Data logging mode
(for U1242B)
15 Data logging viewing mode
(for U1242B)
16 Auto or manual data logging
mode and datalog viewing
mode
(temperature display)
temperature measurement
20 Primary measurement units
21 Measurement range
23 Auto power off indicator
Page 9
Functions and Features
Keypad
Rotary Switch
Function First level
OFF Turn off the
T1 T1 temperature –40 °C to
functions
meter
DCV
measurement
Diode
measurement
Resistance
measurement
Capacitance
measurement
DCµA 0.1 μA to
DCmA 0.01 mA
DCA 0.001 A
Range Second level functions
0.1 mV to
1000 V
0.1 Ω to
100 MΩ
0.1 nF to
10 mF
10 mA
to
440 mA
to 10 A
1000 °C
(press )
ACV measurement 50 mV
Harmonic ratio
(for U1242B)
Switch counter
measurement
Audible continuity
measurement
ACµA measurement 50 μA
ACmA measurement 5 mA to
mA% scale
ACA measurement 0.5 A to
T2 and T1–T2
temperature
measurements
(for U1242B)
Range
to
1000 V
0.0% to
99.9%
to
10 mA
440 mA
10 A
–40 °C
to
1000 °C
Keysight U1241B and U1242B Quick Start Guide 9
Page 10
Action Steps
Turns ON backlight
Checks battery capacity
Freezes the measured value
Starts MIN/MAX/AVG recording
Offsets the measured value
Scan the measured temperature
(for U1242B only)
Changes the measuring range
Turns on auto range
Measures frequency for AC signal
Starts manual data logging
Press .
Press and hold for >1 s.
Press .
Press and hold for >1 s.
Press .
Press and hold for > 1 s.
Press .
Press and hold for > 1 s.
Press .
Press and hold for > 1 s.
10 Keysight U1241B and U1242B Quick Start Guide
Page 11
This information is subject to change
without notice. Always refer to the
Keysight website for the latest revision.
© Keysight Technologies 2009-2021
Edition 9, January 2021
Printed in Malaysia
U1241-90055
www.keysight.com
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