Keysight Technologies
U1270 Series Handheld
Digital Multimeters
Data Sheet
2
Operational down to –40 °C
temperature
The U1273AX OLED handheld digital
multimeter, the latest addition to U1270
Series, is capable of operating in winter
weather down to –40°C temperature.
Even in frigid conditions, the U1273AX
enables you to achieve immediate and
accurate results without the need to
warm up in advance.
OLED for more display clarity
Designed with OLED display, you can
experience crystal-clear measurement
readings with its outstanding 2000:1
contrast ratio. The display also allows
wider viewing angles up to 160
degrees ensuring you get the right
readings at the first glance even in
poorly lit environments.
Increase productivity with
Bluetooth® wireless
connectivity
For wireless connectivity to
smartphones and tablets, the U1270
Series is compatible with the U1177A
infrared-to-Bluetooth adapter for
maximum efficiency and productivity
in completing measurements tasks.
Adding the optional U1177A to a
U1270 Series you can easily perform
remote monitoring and data
logging via Android devices or
Windows-based PC.
Features
– OLED display with 2000:1 contrast
ratio and 160 degrees viewing
angle3,4
– 30,000-count resolution
– Measure up to 1000 V AC and DC
– Measure up to 10 A (20 A for 30 s)
– Resistance, diode test,
temperature, capacitance
– Low Impedance mode2,3,4 and Low
Pass Filter
– Peak detection of up to 250µs
– Continuity test with beeper and
backlight1,2
– Seven readings/s measurement
rate for voltage and current
– Smooth function for accurately
stable readings
– Up to 10,000 points internal
memory for data logging
–Bluetooth wireless connectivity
with optional U1177A Bluetooth
– PC connectivity with optional
U1173A IR-USB cable
– IP 54 certified – water and dust
resistant
– CAT III 1000 V, CAT IV 600 V safety
rating
– Up to 3000m operating altitude
– –40 to 55 °C operating
temperature4
1. U1271A
2. U1272A
3. U1273A
4. U1273AX
Be Ready for Winter
3
Key Functions
Water and dust resistance
(IP54)
The series’ tightly sealed design
helps protect against water, dust
and damage. Each handheld DMM
is certified with IP 54 ratings so
that you can carry out tests and
measurements with confidence,
even in harsh working conditions.
Operational up to 3000
meters altitude
For high altitude applications such
as wind farm maintenance, you can
measure with confidence using the
U1270 Series, capable of measuring
up to 3000 meters above sea level.
High measurement rate at
seven readings per second
for Voltage and Current
You can detect even the slightest
change in your sensitive signals
(Voltage and Current) with its high
measurement rate capability. By
clicking the resettable smooth
function button, you may customize
the readings’ sensitivity suitable for
various tests.
Visual alert for continuity
test (for U1271A and U1272A
only)
Continuity detection in noisy and
dark environments is made easy
with U1270 Series’ loud beeper and
flashing backlight that indicates
continuity and thus improves safety.
Up to 10,000 recording
points for manual, auto and
event logging
Record measurements on-the-go
and transfer data to PC conveniently
with the huge internal memory of up
to 10,000 recording points. The GUI
Data Logging software and optional
U1173A IR-USB cable are required
to transfer data or perform real time
data logging on a PC.
Built-in Low Pass Filter
The U1270 Series offers a 1 kHz LPF
or Low Pass Filter to provide accurate
Variable Frequency Drive (VFD)
output measurements. This function
eliminates high frequency noise and
harmonics, ensuring motor filter
efficiency.
Figure 1. Comparison of voltage output from industrial motor VFD without and with Low Pass Filter functionality.
4
Figure 2. U1272A helps you identify the presence of stray voltage on a disconnected wire running parallel with the wire
powering up the VFD to an industrial motor. The image on the right shows the U1272A in low impedance mode.
Low impedance mode
Stray voltages are usually found
in non-energized electrical wiring
adjacent to powered wires due to
capacitive or inductive coupling
between these wires. The low
impedance mode serves to eliminate
false readings by dissipating these
stray voltages thus improves safety
and measurement efficiency during
voltage measurement.
Peak detect at 250 µs
The peak detect function allows
you to capture the engine or motor
startup transient as fast as 250 µs.
Key Functions
5
Front and Back Panel Description
OLED display with 2000:1
contrast ratio and 160
degree viewing angle
Smart Ω 1 removes residual
voltage of up to 1000 mV
Auto diode 1 automatically
determines diode polarity
Temperature measurement:
J type thermocouple
–210 to 1200 °C 1, K type
thermocouple –200 to 1732 °C
ZLOW
1 provides both high
and low impedance modes
to eliminate stray voltages
Measure up to
1000 V AC and DC
Low Pass Filter (LPF)
removes unwanted high
frequency signals
Measure up to 10 A
(20 A for 30 s)
Front panel
1. U1272A, U1273A and U1273AX only
30,000 counts resolution
Peak detect records tran-
sients as fast as 250μs
Once connected to any HH DMM via Bluetooth adapter you are able to log and view
measurements graphically from smart phones and tablets.
6
Front and Back Panel Description
Back panel
Probe holder/storage
IR-USB connectivity with
optional IR-USB cable
Hang hole
Slim, ergonomic design
for better grip
Easy fuse and battery
access from battery cover
beneath the stand
7
Choose Among These Four Models
U1271A U1272A U1273A U1273A X
Basic Features
Display resolution 30,000 counts 30,000 counts 30,000 counts 30,000 counts
Display LCD LCD OLED OLED
Backlight Yes Yes N/A N/A
True RMS AC AC + DC AC + DC AC + DC
Measurements
Voltage Up to 1000 V AC, DC Up to 1000 V AC, DC Up to 1000 V AC, DC Up to 1000 V AC, DC
Basic dcV accuracy 0.05% + 2 counts 0.05% + 2 counts 0.05% + 2 counts 0.05% + 2 counts
Current Up to 10 A
(20 A for 30 s)
Up to 10 A
(20 A for 30 s)
Up to 10 A
(20 A for 30 s)
Up to 10 A
(20 A for 30 s)
Resistance Up to 100 MΩ Up to 300 MΩ Up to 300 MΩ Up to 300 MΩ
Other measurements
Frequency, capacitance,
temperature, continuity,
diode test
Frequency, capacitance,
temperature, continuity,
diode test
Frequency, capacitance,
temperature, continuity,
diode test
Frequency, capacitance,
temperature, continuity,
diode test
AC bandwidth 20 kHz 100 kHz 100 kHz 100 kHz
Low pass filter
Yes Yes Yes Yes
Low impedance mode — Yes Yes Yes
Smart Ohm — Yes Yes Yes
Safety and Regulatory
Over-voltage safety
protection
CAT III 1000 V,
CAT IV 600 V
CAT III 1000 V,
CAT IV 600 V
CAT III 1000 V,
CAT IV 600 V
CAT III 1000 V,
CAT IV 600 V
General
Logging memory 200 points 10,000 points 10,000 points 10,000 points
Connectivity Optional IR-USB and
Bluetooth
Optional IR-USB and
Bluetooth
Optional IR-USB and
Bluetooth
Optional IR-USB and
Bluetooth
Operating temperature –20 to 55 °C –20 to 55 °C –20 to 55 °C –40 to 55 °C
Altitude 3000 meters 3000 meters 3000 meters 3000 meters
Water and dust ingress
protection IP 54 IP 54 IP 54 IP 54
Battery life Up to 300 hours 4X AAA
Alkaline
Up to 300 hours 4X AAA
Alkaline
Up to 60 hours 4X AAA
Alkaline
Up to 100 hours 4X AAA
Lithium
Warranty 3 years 3 years 3 years 3 years
8
General Specications
Display – U1271A and U1272A: Liquid crystal display (LCD) (with maximum reading of
33,000counts)
– U1273A/U1273AX: Organic LED (OLED) display (with maximum reading of
33,000counts)
Power consumption – U1271A/U1272A: 460 mVA maximum (with backlight enabled)
– U1273A/U1273AX: 180 mVA maximum (with maximum brightness)
Battery type – 4 × 1.5 V Alkaline battery (ANSI/NEDA 24A or IEC LR03), or
– 4 × 1.5 V Zinc Chloride battery (ANSI/NEDA 24D or IEC R03)
– 4 × 1.5 V Lithium battery (ANSI/NEDA 24LF or IEC FR03)
Battery life – U1271A and U1272A: 300 hours typical (based on new Alkaline batteries for DC
voltage measurement)
– U1273A/U1273AX:
– Based on new Alkaline batteries for DC voltage measurement:
30/45/60 hours typical at High/Medium/Low brightness, respectively
– Based on new Lithium batteries for DC voltage measurement:
50/100 hours typical at High/Low brightness, respectively
– Low battery indicator will flash when the battery voltage drops:
– For non-rechargeable batteries: 4.4 V (approximately)
– For rechargeable batteries: 4.5 V (approximately)
Fuse – 10 × 35 mm 440 mA/1000 V 30 kA fast-acting fuse
– 10 × 38 mm 11 A/1000 V 30 kA fast-acting fuse
Input impedance at off mode – 1.67 kΩ (protected by positive temperature coefficient resistor)
(U1272A, U1273A and U1273AX only)
Operating environment – Operating temperature:
– U1271A/ U1272A/U1273A: –20 to 55 °C, 0% to 80% RH
– U1273AX: –40 to 55 °C, 0% to 80% RH (using Lithium batteries)
– Full accuracy up to 80% RH for temperatures up to 30 °C, decreasing linearly to
50% RH at 55 °C
– Altitude up to 3000 meters
– Pollution degree II
Storage compliance –40 to 70 °C, 0 to 80% RH
Safety compliance – CAN/CSA-C22.2 No. 61010-1-04
– EN/IEC 61010-1:2001
– ANSI/UL 61010-1:2004
Measurement category CAT III 1000 V/CAT IV 600 V
Electromagnetic compatibility (EMC) Commercial limits compliance with EN61326-1
Ingress protection rating IP-54
Temperature coefficient U1271A/U1272A/U1273A: 0.05 × (specified accuracy)/°C (from –20 to 18°C, or 28 to 55°C)
U1273AX: 0.05 x (specified accuracy/ °C (from –40 to 18°C, or 28 to 55°C)
Common Mode Rejection Ratio (CMRR) > 120 dB at DC, 50/60 Hz ± 0.1% (1 kΩ unbalanced)
Normal Mode Rejection Ration (NMRR) > 60 dB at 50/60 Hz ± 0.1%
Dimensions (W x H x D) 92 × 207 × 59 mm
Weight – U1271A: 518 grams (with batteries)
– U1272A: 520 grams (with batteries)
– U1273A: 500 grams (with batteries)
– U1273AX: 500 grams (with batteries)
Warranty – Three years for product
– Three months for product’s accessories
Calibration cycle One year
9
Specication Assumptions
– Accuracy is given as ±(% of reading + counts of least significant digit) at 23 °C ± 5 °C, with relative humidity less than
80% RH.
– AC V and AC μA/mA/A specifications are AC coupled, true RMS and are valid from 5% of range to 100% of range.
– The crest factor may be up to 3.0 at full scale except for the 1000 V range where it is 1.5 at full scale.
– For non-sinusoidal waveforms, add (2% reading + 2% full scale) typical, for crest factors up to 3.
– After ZLOW voltage measurements, wait at least 20 minutes for thermal impact to cool before proceeding with any other
measurement.
10
Electrical Specications
DC specications for U1271A, U1272A, U1273A and U1273AX
Function Range Resolution
Accuracy ± (% of reading +
counts of least signicant digit) Test current/
Burden voltage
U1271A U1272A U1273A/U1273AX
Voltage1
30 mV 0.001 mV — 0.05 + 20 0.05 + 20 —
300 mV 0.01 mV 0.05 + 5 0.05 + 5 0.05 + 5 —
3 V 0.0001 V 0.05 + 5 0.05 + 5 0.05 + 5 —
30 V 0.001 V 0.05 + 2 0.05 + 2 0.05 + 2 —
300 V 0.01 V 0.05 + 2 0.05 + 2 0.05 + 2 —
1000 V 0.1 V 0.05 + 2 0.05 + 2 0.05 + 2 —
ZLOW (low
input
impedance)
enabled,
applicable
for 1000 V
range and
resolution
only
0.1 V — 1 + 20 1 + 20 —
Resistance2
30 Ω 0.001 Ω — 0.2 + 10 0.2 + 10 0.65 mA
300 Ω 0.01 Ω 0.2 + 5 0.2 + 5 0.2 + 5 0.65 mA
3 kΩ 0.0001 kΩ 0.2 + 5 0.2 + 5 0.2 + 5 65 µA
30 kΩ 0.001 kΩ 0.2 + 5 0.2 + 5 0.2 + 5 6.5 µA
300 kΩ 0.01 kΩ 0.2 + 5 0.2 + 5 0.2 + 5 0.65 µA
3 MΩ 0.0001 MΩ 0.6 + 5 0.6 + 5 0.6 + 5 93 nA/10 MΩ
30 MΩ 0.001 MΩ 1.2 + 5 1.2 + 5 1.2 + 5 93 nA/10 MΩ
100 MΩ 0.01 MΩ 2.0 +10 — — 93 nA/10 MΩ
300 MΩ 0.01 MΩ — 2.0 + 10 @ < 100 MΩ
8.0 + 10 @ > 100 MΩ
2.0 + 10 @ < 100 MΩ
8.0 + 10 @ > 100 MΩ 93 nA/10 MΩ
300 nS 0.01 nS 1 + 10 1 + 10 1 + 10 93 nA/10 MΩ
Current3
300 µA 0.01 µA 0.2 + 5 0.2 + 3 0.2 + 5 < 0.04 V/100 Ω
3000 µA 0.1 µA 0.2 + 5 0.2 + 3 0.2 + 5 < 0.4 V/100 Ω
30 mA 0.001 mA 0.2 + 5 0.2 + 3 0.2 + 5 < 0.08 V/1 Ω
300 mA 0.01 mA 0.2 + 5 0.2 + 3 0.2 + 5 < 1.00 V/1 Ω
3 A 0.0001 A 0.3 +10 0.3 +10 0.3 +10 < 0.1 V/0.01 Ω
10 A 0.001 A 0.3 +10 0.3 +10 0.3 +10 < 0.3 V/0.01 Ω
Diode Test4
3 V 0.0001 V 0.5 + 5 0.5 + 5 0.5 + 5 Approximately
1 to 2 mA
Auto 0.0001 V — 0.5 + 5 0.5 + 5 Approximately
0.1 to 0.3 mA
See notes on next page.
11
Electrical Specications
Notes for DC specications (previous page)
1. Notes for voltage specifications:
–The accuracy of the 30 to 300 mV range is specified after the Null function is used to subtract the thermal effect (by shorting the test leads).
–For ZLOW measurements, autoranging is disabled and the multimeter’s range is set to 1000 volts in the manual ranging mode.
2. Notes for resistance specifications:
–Overload protection: 1000 Vrms for short circuits with < 0.3 A current.
–Maximum open voltage is < +3.3 V.
–Built-in buzzer beeps when the resistance measured is less than 25 Ω ± 10 Ω. The multimeter can capture intermittent measurements longer than
1 ms.
–The accuracy of the 300 Ω to 3 kΩ range is specified after the Null function is used to subtract the test lead resistance and thermal effect (by
shorting the test leads).
–U1273AX only: The accuracy for all resistance ranges is specified after the Null function is used when measuring at temperatures below –20 °C.
The Null function is used to subtract the test lead resistance and thermal effect (by shorting the test leads).
–For the ranges of 30 MΩ and 100 MΩ, the RH is specified for < 60%.
–The accuracy for ranges < 50 nS is specified after the Null function is used on an open test lead.
–The temperature coefficient of the 100 MΩ and 300 MΩ range is 0.1 × (specified accuracy)/°C (from –40 to 18 °C or 28 to 55 °C).
3. Notes for current specifications:
–Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse.
–Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse.
–Specification for 300 mA range: 440 mA continuous.
–Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals > 10 to 20 A for 30 seconds
maximum. After measuring currents > 10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
4. Notes for diode specifications:
–Overload protection: 1000 Vrms for short circuits with < 0.3 A current.
–Built-in buzzer beeps continuously when the voltage measured is less than 50 mV and beeps once for forward-biased diode or semiconductor
junctions measured between 0.3 V and 0.8 V (0.3 V ≤ reading ≤ 0.8 V).
–Open voltage for diode: < +3.3 V DC.
–Open voltage for Auto diode: < +2.5 V DC and > –1.0 V DC.
12
Electrical Specications
AC specications for U1271A
Function Range Resolution
Accuracy ± (% of reading + counts of least signicant digit)
45 Hz to
65 Hz
30 Hz to
1 kHz
1 kHz to
5 kHz
5 kHz to
20 kHz
True RMS AC
Voltage1
300 mV 0.01 mV 0.7 + 20 1.0 + 25 2.0 + 25 2.0 + 40
3 V 0.0001 V 0.7 + 20 1.0 + 25 2.0 + 25 2.0 + 40
30 V 0.001 V 0.7 + 20 1.0 + 25 2.0 + 25 2.0 + 40
300 V 0.01 V 0.7 + 20 1.0 + 25 2.0 + 25 —
1000 V 0.1 V 0.7 + 20 1.0 + 25 — —
LPF (low pass filter) enabled,
applicable for all voltage
ranges and resolution
0.7 + 20 1.0 + 25 @ < 200 Hz
5.0 + 25 @ < 440 Hz — —
Function Range Resolution
Accuracy ± (% of reading + counts of least
signicant digit) Burden voltage/Shunt
45 Hz to 2 kHz
True RMS AC
Current2
300 µA 0.01 µA 0.9 + 25 < 0.04 V/100 Ω
3000 µA 0.1 µA 0.9 + 25 < 0.4 V/100 Ω
30 mA 0.001 mA 0.9 + 25 < 0.08 V/1 Ω
300 mA 0.01 mA 0.9 + 25 < 1.00 V/1 Ω
3 A 0.0001 A 1.0 + 25 < 0.1 V/0.01 Ω
10 A 0.001 A 1.0 + 25 < 0.3 V/0.01 Ω
1. Notes for voltage specifications:
–Overload protection: 1000 Vrms. For millivolt measurements, 1000 Vrms for short circuits with < 0.3 A current.
–Input impedance: 10 MΩ (nominal) in parallel with < 100 pF.
2. Notes for current specifications:
–Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse.
–Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse.
–Specification for 300 mA range: 440 mA continuous.
–Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals > 10 to 20 A for 30 seconds
maximum. After measuring currents > 10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
13
Electrical Specications
AC specications for U1272A/U1273A and U1273AX
Function Range Resolution
Accuracy ± (% of reading + counts of least signicant digit)
45 Hz to
65 Hz
20 Hz to
1 kHz
1 kHz to
5 kHz
5 kHz to
20 kHz
20 kHz to
100 kHz
True RMS AC
Voltage1
30 mV 0.001 mV 0.6 + 20 0.7 + 25 1.0 + 25 1.0 + 40 3.5 + 40
300 mV 0.01 mV 0.6 + 20 0.7 + 25 1.0 + 25 1.0 + 40 3.5 + 40
3 V 0.0001 V 0.6 + 20 1.0 + 25 1.5 + 25 2.0 + 40 3.5 + 40
30 V 0.001 V 0.6 + 20 1.0 + 25 1.5 + 25 2.0 + 40 3.5 + 40
300 V 0.01 V 0.6 + 20 1.0 + 25 1.5 + 25 2.0 + 40 —
1000 V 0.1 V 0.6 + 20 1.0 + 25 1.5 + 25 — —
LPF (low pass filter) enabled,
applicable for all voltage
ranges and resolution
0.6 + 20 1.0 + 25 @ < 200 Hz
5.0 + 25 @ < 440 Hz — — —
ZLOW 1000 V 2.0 + 40 2 + 40 @ < 440 Hz — — —
Function Range Resolution
Accuracy ± (% of reading +
counts of least signicant digit) Burden voltage/Shunt
45 Hz to 65 Hz 20 Hz to 2 kHz
True RMS AC
Current2
300 µA 0.01 µA 0.6 + 25 0.9 + 25 < 0.04 V/100 Ω
3000 µA 0.1 µA 0.6 + 25 0.9 + 25 < 0.4 V/100 Ω
30 mA 0.001 mA 0.6 + 25 0.9 + 25 < 0.08 V/1 Ω
300 mA 0.01 mA 0.6 + 25 0.9 + 25 < 1.00 V/1 Ω
3 A 0.0001 A 0.8 + 25 1.0 + 25 < 0.1 V/0.01 Ω
10 A 0.001 A 0.8 + 25 1.0 + 25 < 0.3 V/0.01 Ω
1. Notes for voltage specifications:
–Overload protection: 1000 Vrms. For millivolt measurements, 1000 Vrms for short circuits with < 0.3 A current.
–Input impedance: 10 MΩ (nominal) in parallel with < 100 pF.
–ZLOW impedance: 2 kΩ (nominal).
–The input signal is lower than the product of 20,000,000 V×Hz.
–For 20 to 100 kHz accuracy: Three counts of the LSD per kHz of additional error is to be added for frequencies > 20 kHz and signal inputs < 10%
of range.
–U1273AX only: For all AC voltage ranges, the accuracy is specified at 2.5% + 25 counts when measuring below –20 °C for 20 to 45 Hz AC
signals.
2. Notes for current specifications:
–Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse.
–Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse.
–Specification for 300 mA range: 440 mA continuous.
–Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals > 10 to 20 A for 30 seconds
maximum. After measuring currents > 10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
–U1273AX only: The accuracy for the 300 μA range, 3000 μA range, and 30 mA is specified after the Null function is used when measuring at
temperatures below –20 °C. The Null function is used to subtract the test lead resistance and thermal effect (by shorting the test leads).
–U1273AX only: For all AC current ranges, the accuracy is specified at 2.5% + 25 counts when measuring below –20 °C for 20 to 45 Hz AC
signals.
14
Electrical Specications
AC + DC specications for U1272A/U1273A and U1273AX
Function Range Resolution
Accuracy ± (% of reading + counts of least signicant digit)
45 Hz to
65 Hz
20 Hz to
1 kHz
1 kHz to
5 kHz
5 kHz to
20 kHz
20 kHz to
100 kHz
True RMS
AC + DC
Voltage1
30 mV 0.001 mV 0.7 + 40 0.8 + 45 1.1 + 45 1.1 + 60 3.6 + 60
300 mV 0.01 mV 0.7 + 25 0.8 + 30 1.1 + 30 1.1 + 45 3.6 + 45
3 V 0.0001 V 0.7 + 25 1.1 + 30 1.6 + 30 2.1 + 45 3.6 + 45
30 V 0.001 V 0.7 + 25 1.1 + 30 1.6 + 30 2.1 + 45 3.6 + 45
300 V 0.01 V 0.7 + 25 1.1 + 30 1.6 + 30 2.1 + 45 —
1000 V 0.1 V 0.7 + 25 1.1 + 30 1.6 + 30 — —
Function Range Resolution
Accuracy ± (% of reading +
counts of least signicant digit) Burden voltage/Shunt
45 Hz to 65 Hz 20 Hz to 2 kHz
True RMS
AC + DC
Current2
300 µA 0.01 µA 0.8 + 30 1.1 + 30 < 0.04 V/100 Ω
3000 µA 0.1 µA 0.8 + 30 1.1 + 30 < 0.4 V/100 Ω
30 mA 0.001 mA 0.8 + 30 1.1 + 30 < 0.08 V/1 Ω
300 mA 0.01 mA 0.8 + 30 1.1 + 30 < 1.00 V/1 Ω
3 A 0.0001 A 0.9 + 35 1.3 + 35 < 0.1 V/0.01 Ω
10 A 0.001 A 0.9 + 35 1.3 + 35 < 0.3 V/0.01 Ω
1. Notes for voltage specifications:
–Overload protection: 1000 Vrms. For millivolt measurements, 1000 Vrms for short circuits with < 0.3 A current.
–Input impedance: 10 MΩ (nominal) in parallel with < 100 pF.
–For 20 to 100 kHz accuracy: Three counts of the LSD per kHz of additional error is to be added for frequencies > 20 kHz and signal inputs < 10%
of range.
–U1273AX only: For all AC+DC voltage ranges, the accuracy is specified at 2.5% + 30 counts when measuring below –20 °C for 20 to 45 Hz
AC+DC signals.
2. Notes for current specifications:
–Overload protection for 300 μA to 300 mA range: 0.44 A/1000 V; 10 × 35 mm 30 kA fast-acting fuse.
–Overload protection for 3 A to 10 A range: 11 A/1000 V; 10 × 38 mm 30 kA fast-acting fuse.
–Specification for 300 mA range: 440 mA continuous.
–Specification for 10 A range: 10 A continuous. Add 0.3% to the specified accuracy when measuring signals > 10 to 20 A for 30 seconds
maximum. After measuring currents > 10 A, cool down the multimeter for twice the duration of the measured time before proceeding with low
current measurements.
–U1273AX only: The accuracy for the 300 μA range, 3000 μA range, and 30 mA is specified after the Null function is used when measuring at
temperatures below –20 °C. The Null function is used to subtract the test lead resistance and thermal effect (by shorting the test leads).
–U1273AX only: For all AC+DC current ranges, the accuracy is specified at 2.5% + 30 counts when measuring below –20 °C for 20 to 45 Hz
AC+DC signals.
15
Electrical Specications
Temperature specications1 - 6
Thermocouple
type Range Resolution
Accuracy ± (% of reading +
as specied below)
U1271A U1272A U1273A/U1273AX
K
–200 to 1372 °C 0.1 °C 1% of reading
+ 1 °C
1% of reading
+ 1 °C
1% of reading
+ 1 °C
–328 to 2502 °F 0.1 °F 1% of reading
+ 1.8 °F
1% of reading
+ 1.8 °F
1% of reading
+ 1.8 °F
J
–210 to 1200 °C 0.1 °C — 1% of reading
+ 1 °C
1% of reading
+ 1 °C
–346 to 2192 °F 0.1 °F —1% of reading
+ 1.8 °F
1% of reading
+ 1.8 °F
1. The specifications above is specified after 60 minutes of warm-up time.
2. The accuracy does not include the tolerance of the thermocouple probe.
3. Do not allow the temperature sensor to contact a surface that is energized above 30 Vrms or 60 V DC. Such voltages pose a shock hazard.
4. Ensure that the ambient temperature is stable within ±1 ºC and that the Null function is used to reduce the test lead’s thermal effect and temperature
offset. Before using Null function, set the multimeter to measure temperature without ambient compensation (°C) and keep the thermocouple probe
as close to the multimeter as possible (avoid contact with any surface that has a different temperature from the ambient temperature).
5. When measuring temperature with respect to any temperature calibrator, try to set both the calibrator and multimeter with an external reference
(without internal ambient compensation). If both the calibrator and multimeter are set with internal reference (with internal ambient compensation),
some deviations may show between the readings of the calibrator and multimeter, due to differences in ambient compensation between the
calibrator and multimeter. Keeping the multimeter close to the output terminal of calibrator will help reduce the deviation.
6. The temperature calculation is specified according to the safety standards of EN/IEC-60548-1 and NIST175.
Capacitance specications7, 8
Range Resolution
Accuracy ± (% of reading +
counts of least signicant digit)
U1271A U1272A U1273A/U1273AX
10 nF 0.001 nF 1 + 5 1 + 5 1 + 5
100 nF 0.01 nF 1 + 2 1 + 2 1 + 2
1000 nF 0.1 nF 1 + 2 1 + 2 1 + 2
10 μF 0.001 μF 1 + 2 1 + 2 1 + 2
100 μF 0.01 μF 1 + 2 1 + 2 1 + 2
1000 μF 0.1 μF 1 + 2 1 + 2 1 + 2
10 mF 0.001 mF 1 + 2 1 + 2 1 + 2
7. Overload protection: 1000 Vrms for short circuits with < 0.3 A current.
8. The accuracy for all ranges is specified based on a film capacitor or better, and after the Null function is used to subtract the test lead resistance and
thermal effect (by shorting the test leads).
16
Electrical Specications
Frequency specications1, 2
Range Resolution Accuracy ± (% of reading +
counts of least signicant digit) Minimum input frequency
99.999 Hz 0.001 Hz 0.02 + 5
0.5 Hz
999.99 Hz 0.01 Hz 0.005 + 5
9.9999 kHz 0.1 Hz 0.005 + 5
99.999 kHz 1 Hz 0.005 + 5
999.99 kHz 0.01 kHz 0.005 + 5
> 1 MHz 0.1 kHz 0.005 + 5 @ < 1 MHz
1. Overload protection: 1000 V; input signal is < 20,000,000 V × Hz (product of voltage and frequency).
2. The frequency measurement is susceptible to error when measuring low-voltage, low-frequency signals. Shielding inputs from external noise pickup is
critical for minimizing measurement errors. Turning on the low pass filter may help you to filter out the noise and achieve a stable reading.
Duty Cycle3
Mode Range Accuracy at full scale
DC coupling 99.99% 0.3 % per kHz + 0.3 %
AC coupling 99.99% 0.3 % per kHz + 0.3 %
3. Notes for duty cycle specifications:
–The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range. For AC couplings, the duty
cycle range can be measured within the range of 10% to 90% for signal frequencies > 20 Hz.
–The range of the duty cycle is determined by the frequency of the signal: {10 μs × frequency × 100%} to {[1 – (10 μs × frequency)] × 100%}.
–The pulse width (positive or negative) must be > 10 μs. The range of the pulse width is determined by the frequency of the signal.
Pulse Width4
Range Resolution Accuracy at full scale
999.99 ms 0.01 ms (duty cycle accuracy/frequency) + 0.01 ms
2000.0 ms 0.1 ms (duty cycle accuracy/frequency) + 0.1 ms
4. Notes for pulse width specifications:
–The accuracy for duty cycle and pulse width measurements is based on a 3 V square wave input to the DC 3 V range.
–The pulse width (positive or negative) must be > 10 μs. The range of the pulse width is determined by the frequency of the signal.
17
Electrical Specications
U1271A and U1272A frequency sensitivity for voltage measurements1, 2, 3
Input range
Minimum sensitivity (RMS sine wave) Trigger level for DC coupling
15 Hz to
100 kHz
0.5 Hz to
200 kHz
Up to
1 MHz
0.5 Hz to 200 kHz
U1271A U1272A
30 mV 3 mV 3 mV — — 5 mV
300 mV 6 mV 8 mV 40 mV 10 mV 15 mV
3 V 0.12 V 0.2 V 0.4 V 0.15 V 0.15 V
30 V 0.6 V 0.8 V 2.6 V 1.5 V 1.5 V
300 V 6 V 8 V @ < 100 kHz — 9 V @ < 100 kHz 9 V @ < 100 kHz
1000 V 50 V 50 V @ < 100 kHz — 90 V @ < 100 kHz 90 V @ < 100 kHz
1. Maximum input for specified accuracy, refer to “AC specifications” on page 12.
2. 30 mV range applicable for U1272A only.
3. 200 kHz to 1 MHz range applicable for U1272A only.
U1273A/U1273AX sensitivity for voltage measurements4
Input range Frequency sensitivity and trigger level
Minimum sensitivity (RMS sine wave) Trigger level for DC coupling
Maximum input for specied
accuracy, refer to AC voltage
15 Hz to
100 kHz
0.5 Hz to
200 kHz
Up to
1 MHz 0.5 Hz to 200 kHz
30 mV 3 mV 3 mV — 5 mV
300 mV 7 mV 8 mV 38 mV 15 mV
3 V 0.12 V 0.12 V 0.48 V 0.15 V
30 V 0.8 V 0.8 V 3.5 V 1.5 V
300 V 6.7 V 8 V < 100 kHz — 11 V < 100 kHz
1000 V 67 V 67 V < 100 kHz — 110 V < 100 kHz
4. Maximum input for specified accuracy, refer to “AC specifications” on page 13.
Frequency sensitivity for current measurements5
Input range
Minimum sensitivity (RMS sine wave)
2 Hz to 30 kHz
U1271A/U1272A U1273A/U1273AX
300 µA 100 µA 70 μA
3000 µA 70 µA 120 μA
30 mA 1.2 mA 1.2 mA
300 mA 12 mA 12 mA
3 A 0.12 A 0.12 A
10 A 1.2 A 1.2 A
5. Maximum input for specified accuracy, refer to “AC specifications” on page 12 and 13.
18
Electrical Specications
Peak hold
Signal width Accuracy for DC Voltage and Current
Single event >1 ms Specified accuracy + 400
Repetitive >250 µs Specified accuracy + 1000
Decibel (dB) for U1272A and U1273A1, 2, 3
dB base Reference Default reference
1 mW (dBm) 1 to 9999 Ω 50 Ω
1 V (dBV) 1 V 1 V
1. The reading of dBm is indicated in decibels of power above or below 1 mW, or decibels of voltage above or below 1 V. The formula is calculated
according to the voltage measurement and specified reference impedance. Its accuracy is depended on the accuracy of the voltage measurement.
See Decibel (dBV) accuracy table below.
2. Auto-ranging mode is used.
3. The bandwidth is according to voltage measurement.
Decibel (dBV) accuracy
Range
dBV range Accuracy
Minimum Maximum 45 Hz to
65 Hz
20 Hz to
1 kHz
1 Hz to
5 kHz
5 kHz to
20 kHz
20 Hz to
100 kHz
30 mV –56.48 –30.46 0.06 0.07 0.09 0.1 0.32
300 mV –36.48 –10.46 0.06 0.07 0.09 0.1 0.32
3 V –16.48 +9.54 0.06 0.09 0.14 0.19 0.32
30 V +3.52 +29.54 0.06 0.09 0.14 0.19 0.32
300 V +23.52 +49.54 0.06 0.09 0.14 0.19 —
1000 V +33.98 +60 0.06 0.09 0.14 — —
Measurement rate (approximate)
Function Times/second
U1271A U1272A/U1273A/U1273AX
ACV 7 7
DCV 7 7
Ω 14 14
Ω with offset compensation - 3
Diode 14 14
Auto Diode - 3
Capacitance 4 (< 100 µF) 4 (< 100 µF)
DCA 7 7
ACA 7 7
Temperature 7 7
Frequency 2 (> 10 Hz) 2 (> 10 Hz)
Duty cycle 1 (> 10 Hz) 1 (> 10 Hz)
Pulse width 1 (> 10 Hz) 1 (> 10 Hz)
19
Ordering Information
Standard shipped accessories
Standard test leads, test probes with 4-mm tips, K-type thermocouple and adapter, 4x AAA alkaline batteries (4x AAA lithium batteries
for U1273AX only), Certificate of Calibration, UK 6 (test report), Quick Start Guide
Optional accessories
Measuring accessories (non-temperature)
U1161A
Extended test
lead kit
Includes two test leads (red and black), two test probes, medium-
sized alligator clips and 4-mm banana plugs.
– Test leads: CAT III 1000 V, CAT IV 600 V, 15 A
– Test probes (4-mm tips): CAT III 1000 V, CAT IV 600 V, 15 A
– Medium-sized alligator clips: CAT III 1000 V/CAT IV 600 V, 15 A
– 4-mm banana plugs: CAT II 600 V, 10 A
U1162A
Alligator clips
– One pair of insulated alligator clips (red and black).
Recommended for use with Keysight standard test leads.
– CAT III 1000 V, CAT IV 600 V, 15 A
U1163A
SMT grabbers
– One pair of SMT grabbers (red and black). Recommended for use
with Keysight standard test leads.
– Rated CAT II 300 V, 3 A
U1164A
Fine-tip test
probes
– One pair of fine-tip test probes (red and black). Recommended for
use with Keysight standard test leads.
– Rated CAT II 300 V, 3 A
U1168A
Standard test
lead kit
Includes two test leads (red and black), 4-mm test probes, alligator
clips, fine-tip test probes, SMT grabbers and mini grabber (black).
– Test leads: CAT III 1000 V, CAT IV 600 V, 15 A
– Test probe (19-mm tips): CAT II 1000 V, 15 A
– Test probe (4-mm tips): CAT III 1000 V, CAT IV 600 V, 15 A
(highly recommended for CAT IV environment)
– Alligator clips: CAT III 1000 V, CAT IV 600 V, 15 A
– Fine-tip test probes: CAT II 300 V, 3 A
– SMT grabber: CAT II 300 V, 3 A
– Mini grabber: CAT II 300 V, 3 A
U1583B
AC current clamp
– Dual range: 40 A and 400 A
– Rated CAT III 600 V
– BNC-to-banana-plug adapter provided for use with DMMs
– -40 to 55 °C operating temperature
U1271A U1272A U1273A U1273AX
20
Ordering Information
Optional accessories
Measuring accessories (temperature)
U1180A
Thermocouple
adapter+lead kit,
J and K types
Includes thermocouple adapter, thermocouple bead J-type and
thermocouple bead K-type.
– T/C adapter J/K-type
– T/C bead J-type: –20 to 200 °C
– T/C bead K-type: –20 to 200 °C
U1181A
Immersion
temperature probe
– Type-K T/C for use in oil and other liquids
– Measurement range: –50 to 700 ºC
– Includes adapter U1184A for connection to DMM
U1182A
Industrial surface
temperature probe
– Type-K T/C for use on still surfaces
– Measurement range: –50 to 400 ºC
– Includes adapter U1184A for connection to DMM
U1183A
Air temperature
probe
– Type-K T/C for use in air and non-caustic gas
– Measurement range: –50 to 800 ºC
– Includes adapter U1184A for connection to DMM
U1184A
Temperature probe
adapter
– Mini-connector-to-banana-plug adapter for use with DMM
U1185A
J-type thermocouple
and adapter
– T/C adapter J/K-type
– T/C bead J-type: –20 to 200 °C
U1186A
K-type
thermocouple and
adapter
– T/C adapter J/K-type
– T/C bead J-type: –20 to 200 °C
21
Ordering Information
Optional accessories
U1171A
Magnetic hanging
kit
For fastening the DMM to a steel surface so both hands are free
U1173A
IR-to-USB cable
– For remote control and data logging to PC
– Maximum baud rate: 19,200 bits per second
U1174A
Soft carrying case
The convenient way to carry your DMM and essential accessories
– Dimension: 9 inches (H) x 5 inches (W) x 3 inches (D)
U1177A
Bluetooth Adapter
– Enables Bluetooth connection to Keysight handheld digital
multimeters
– Support the U1230, U1240, U1250 and U1270 Series handheld
multimeters
– Remote monitoring and data logging capabilities via Android
devices or Windows-based PC
– Recommended to use Lithium battery in lower than -20°C in
temperature for long hours of operation
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(BP-09-04-14)
22 | Keysight | U1270 Series Handheld Digital Multimeters - Data Sheet
This information is subject to change without notice.
© Keysight Technologies, 2013 - 2014
Published in USA, August 3, 2014
5990-6425EN
www.keysight.com
