02 | Keysight | U1240B Series Handheld Digital Multimeters - Data Sheet
Key Features
Check more, fix more
–
–
–
–
10,000-count display
0.09% basic DCV accuracy
True RMS AC measurement
Basic functions — ACV, DCV, ACI,
DCI, resistance, frequency, diode,
continuity tests
– Advanced functions —
Capacitance, temperature,
MINMAX recording
Keysight Technologies, Inc. U1240B Series handheld digital multimeters enable you to
check more with wider measurement ranges. They feature true RMS readings on their
10,000-count displays. The adjustable backlighting allows you to complete your jobs
even in subdued lighting conditions, or to simply prolong battery life. Your maintenance
tasks are greatly simplified due to the built-in switch counter, harmonic ratio, dual and
differential temperature capabilities, with just a press of the button. The meters have a
high safety rating with CAT III 1000 V and CAT IV 600 V protection and are certified to
CE and CSA standards. On top of that, the U1240B Series comes with a certificate of
calibration and test report – at no extra cost.
The latest multimeters in this series, the U1241B and U1242B, now come in vivid orange
cases, offering the capabilities and functions you need.
Ease of use
– Adjustable backlighting —
two intensity levels
– Manual data logging
(U1242B only)
– Built-in switch counter,
harmonic ratio (U1242B only),
dual/differential temperature
capabilities (U1242B only)
Functions and ranges at a glance
Ambient
temperature
MINMAX recording
Resistance:
0.1 Ω to 100 MΩ
Backlight:
Two intensity levels
Diode test
switch counter
DCV: 0.1m V to 1000 V
ACV: 50m V to 1000 V
Harmonic ratio
(U1242B only)
T1–T2 Differential
temperature
(U1242B only)
Capacitance:
0.1 nF to 10 mF
ACµA: 50 uA to 10 mA
Frequency: 1 Hz to 200 kHz
Manual data logging
(U1242B only)
ACmA: 5 mA to 440 mA
ACA: 0.5 A to 10 A
Temperature:
–40 to 1000 °C
Built to last
– Overmold body casing
– CAT III 1000 V and CAT IV 600 V
safety protection
– Certified to CE and CSA standards
– Operating temperature
–10 to 55 °C
03 | Keysight | U1240B Series Handheld Digital Multimeters - Data Sheet
Electrical Specifications
DC specifications
Function
Voltage
1
Range
1000.0 mV
10.000 V
100.00 V
1000.0 V
Current
1000.0 µA
10000 µA
100.00 mA
440.0 mA
2
10.000 A
3
Resistance
4
1000.0 Ω
5
10.000 kΩ
5
100.00 kΩ
1000.0 kΩ
10.000 MΩ
100.00 MΩ
6
Diode test
7
1V
Resolution
0.1 mV
0.001 V
0.01 V
0.1 V
0.1 µA
1 µA
0.01 mA
0.1 mA
0.001 A
0.1 Ω
0.001 kΩ
0.01 kΩ
0.1 kΩ
0.001 MΩ
0.01 MΩ
0.001 V
Test current/burden voltage
–
–
–
–
< 0.06 V (50 Ω)
< 0.55 V (50 Ω)
< 0.18 V (0.5 Ω)
< 0.8 V (0.5 Ω)
< 0.4 V (0.01 Ω)
0.5 mA
50 µA
4.91 µA
447 nA
112 nA
112 nA
approximately 0.5 mA
0.8% + 3
1.5% + 3
0.3% + 2
0.3% + 3
Accuracy ±(% of reading + counts of least significant digit)
U1241B
0.09% + 5
0.09% + 2
0.15% + 5
0.1% + 3
0.1% + 3
0.2% + 3
0.5% + 3
0.6% + 5
U1242B
1. Input impedance: 10 MΩ (nominal).
2. Current can be measured up to 440 mA continuously. An additional 0.2% needs to be added to the specified accuracy if the signal measured is in the range
of 440 mA to 1100 mA for 30 seconds maximum. After measuring a current of > 440 mA, leave the meter to cool down for twice the measuring time used
before applying a low current measurement.
3. Current can be measured up to 10 A continuously with a maximum operating temperature of 50 °C. An additional 0.3% needs to be added to the specified
accuracy if the signal measured is in the range of 10 A to 19.999 A for 15 seconds maximum. After measuring a current of > 10 A, leave the meter to cool
down for 60 seconds before applying a low current measurement.
4. The maximum open voltage is < 2.8 V. For instant continuity, the built-in buzzer sounds when resistance is < 10.0 Ω.
5. The accuracy of 1 kΩ and 10 kΩ is specified after Null function, which is used to substrate the test lead resistance and the thermal effect.
6. For the range of 100 MΩ, the R.H. is specified for < 60%. The temperature coefficient will be 0.15 times of specified accuracy as > 50 MΩ.
7. Overload protection: 1000 V RMS for circuits < 0.3 A short circuit current. The built-in buzzer sounds when reading is approximately below 50 mV and
audible single tone for normal forward biased diode or semiconductor junction as 0.3 V ≤ Reading ≤ 0.8 V.
04 | Keysight | U1240B Series Handheld Digital Multimeters - Data Sheet
Electrical Specifications
AC specifications
Function
AC voltage
1, 5
True RMS
Range
1000.0 mV
10.000 V
100.00 V
1000.0 V
AC current
2, 5
True RMS
1000.0 µA
10000 µA
100.00 mA
440.0 mA
3
10.000 A
4
Resolution
0.1 mV
0.001 V
0.01 V
0.1 V
0.1 µA
1 µA
0.01 mA
0.1 mA
0.001 A
Test current/burden voltage
–
–
–
–
< 0.06 V (50 Ω)
< 0.55 V (50 Ω)
< 0.18 V (0.5 Ω)
< 0.8 V (0.5 Ω)
< 0.4 V (0.01 Ω)
1% + 5
1.5% + 5
–
1% + 5
Accuracy ± (% of reading + counts of least significant digit)
40 to 500 Hz
500 Hz to 1 kHz
2% + 5
1% + 5
1 to 2 kHz
–
2% + 5
–
1. Input impedance: 10 MΩ (nominal) in parallel with < 100 pF, with overload protection of 1000 V RMS
2. Crest factor ≤ 3. For non-sinusoidal waveforms with crest factor up to 3, add 2% reading + 2% full scale typical.
3. Current can be measured from 50 mA to 440 mA continuously. An additional 0.2% needs to be added to the specified accuracy if the signal
measured is in the range of 440 mA to 1100 mA for 30 seconds maximum. After measuring a current of > 440 mA, leave the meter to cool
down for twice the measuring time used before application of low current measurement.
4. Current can be measured from 0.5 A up to 10 A continuously with a maximum operating temperature of 50 °C. An additional 0.3% needs to
be added to the specified accuracy if the signal measured is in the range of 10 A to 19.999 A for 15 seconds maximum. After measuring a
current of >10 A, leave the meter to cool down for 60 seconds before applying a low current measurement.
5. AC voltage and AC current specifications are AC coupled. True RMS measurement is valid from 5 % of range to 100 % of range.
Temperature specifications
Thermocouple type
K (for U1241B and U1242B)
J (for U1242B only)
Range
–40 to 1000 ºC/–48 to 1832 ºF
–40 to 1000 ºC/–48 to 1832 ºF
Resolution
0.1 °C /0.1 °F
0.1 ºC/0.1 ºF
Accuracy ± (% of reading + offset error)
1% + 1 ºC/1% + 1.8 °F
1% + 1 ºC/1% + 1.8 °F
Capacitance specifications
Range
1000.0 nF
10.000 µF
100.00 µF
1000.0 µF
10.000 mF
Resolution
0.1 nF
0.001 µF
0.01 µF
0.1 µF
0.001 mF
2% + 4
1.2% + 4
Accuracy ± (% of reading + counts of least significant digit)
Harmonic ratio specifications
Range
0.0% to 99.9%
Frequency
40 to 500 Hz
Voltage
100 mVAC to 1000 VAC
05 | Keysight | U1240B Series Handheld Digital Multimeters - Data Sheet
Electrical Specifications
Switch counter definition
Switch condition
1, 2
Low level
Intermittent
4
High level
Intermittent
5
1.
2.
3.
4.
5.
Circuit switch
Normally close
Close to open
Normally open
Open to close
Display
3
Lo
Number of switch count
Hi
Number of switch count
Switch threshold
< 370 ohms
Low to high transition
> 430 ohms
High to low transition
Detects intermittent Opens or Closes lasting for at least 250 μsec.
Test current of 0.5 mA with maximum open circuit voltage of 2.8 V is used.
Maximum count reading: 199.99 M (display “OL” when achieving 2 x 10
8
and thereafter).
Count only low to high transition for initial switch condition of Low.
Count only high to low transition for initial switch condition of High.
Frequency specifications
Range
100.00 Hz
1000.0 Hz
10.000 kHz
100.00 kHz
1000.0 kHz
1
1.
Resolution
0.01 Hz
0.1 Hz
0.001 kHz
0.01 kHz
0.1 kHz
Accuracy
Minimum input frequency
0.03%+3
1 Hz
Effective frequency measurement of up to 200 kHz; refer to frequency sensitivity table below for details.
Frequency sensitivity during voltage measurement
Input range (Maximum input for specified accuracy = 10 x Range or 1000 V)
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