U3401A - KEYSIGHT TECHNOLOGIES

Basic + Good = Elegant Simplicity

Keysight Technologies

U3400 Series 4½ and 5½ Digit

Digital Multimeters

Data Sheet

Simply right for your basic needs, without

compromising quality

The U3400 Series digital multimeters (DMMs) come with functions vital for your everyday

measurements: DC, AC and AC+ DC voltage and current, 2- and 4-wire resistance,

frequency, continuity and diode tests.

Math functions dBm, Min/Max, Relative, Compare, Hold and Percentage** are also

available to ease your measurement analysis.

Not only are the U3400 Series built robust for lasting reliability over the long haul, these

DMMs also ensure dependable measurements with up to 0.012% basic DCV accuracy.

Efcient testing with dual display and selectable

resolutions*

Dual display on the U3400 Series lets you view two parameters simultaneously as you

measure, and further enhances your troubleshooting tasks. For example, theability to see

both AC voltage and frequency simultaneously would help you to measure the frequency

response of amplier circuits more efciently and effectively. Refer to Page 3 for more

typical dual display combinations and applications.

Up to three measurement speeds are available on the U3402A: Slow, Medium and Fast.

This means greater exibility in catering to different testing needs: a faster measurement

speed at lower resolution or a higher resolution at slower measurement speed.

Physical security

Your instruments may be at risk of theft or misplacement whenever you leave them

unattended on the bench. With the U3400 Series’ rear Kensington lock slot, you can

secure your DMM and be assured that it is where you expect it to be for your continued

testing the next day.

Features

– Up to 120,000 counts

resolution

– Up to 0.012% basic DCV

accuracy

– 11 basic measurements

and up to six built-in math

functions

– Dual display on bright VFD

– Selectable resolutions for

variable measurement

speeds*

– Kensington lock slot

security

* U3402A only

** U3401A only

02 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Take a closer look

Primary display Secondary display

Input terminals

and current fuse

AC line

voltage selector

Line voltage fuse

selection table

AC power

connector

RS232 interface connector

(For calibration use only)

AC line fuse Chassis ground lug

Measurement

function

keypads

Autoranging,

manual range

and comparator

operation

Math

operation

keypads

Power

on/off

switch

Shift

Figure 1 Front panel of the U3402A. The front panel of the U3401A is similar with

slight differences in the position of certain functions. Please refer to the U3401A’s

User’s and Service Guide U3401-90001 for details.

Figure 2 Rear panel of the U3401A/U3402A.

03 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Typical dual display combinations and applications

Primary display Secondary display Application Available in

DCV ACV –Testing of DC-to-AC or AC-to-DC converter circuit U3402A, U3401A

ACV + DCV DCV –Power supply DC level and AC ripple measurement U3402A, U3401A

DCV DCI –Testing of power supply load regulation U3402A

DCV ACI –Loop current and voltage drop level checking U3402A

ACI + DCI DCV –Testing of line and load regulation U3402A

ACV DCI –Testing of AC-to-DC or DC-to-AC converter U3402A

ACI + DCI ACV –Power supply DC level and AC ripple measurement U3402A

ACV ACI –Transformer testing U3402A

ACV Hz –Amplier circuit’s AC frequency response measurement U3402A, U3401A

ACI Hz –Adjustment of AC motor control U3402A, U3401A

DCI ACI –Power supply AC ripple and DC current measurement U3402A, U3401A

ACI + DCI DCI –Current dissipation measurement U3402A, U3401A

dBm Reference W

–RF frequency measurement

U3401A

dBm DCV U3402A, U3401A

dBm ACV U3402A, U3401A

dBm Hz –Frequency response checking U3402A

04 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

U3400 Series specications

DC voltage

DCV resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC) Typical input impedance1

500.00 mV 10 µV 510.00 0.02% + 4 10.0 MW

5.0000 V 100 µV 5.1000 0.02% + 4 11.1 MW

50.000 V 1 mV 51.000 0.02% + 4 10.1 MW

500.00 V 10 mV 510.00 0.02% + 4 10.0 MW

1000.0 V 100 mV 1200.020.02% + 4 10.0 MW

1. Input impedance is in parallel with capacitance <100 pF.

2. In VDC 1000 V range, 1200 V is readable with audio warning.

Rate Range Resolution Maximum reading Accuracy

(1 year; 23 ºC ± 5 ºC)

Typical input impedance1

Slow 120.000 mV

1.20000 V

12.0000 V

120.000 V

1000.00 V

1 µV

10 µV

100 µV

1 mV

10 mV

119.999

1.19999

11.9999

119.999

1000.003

0.012% + 82

0.012% + 5

10.0 MW

11.1 MW

10.1 MW

10.0 MW

Medium 400.00 mV

4.0000 V

40.000 V

400.00 V

1000.0 V

10 µV

100 µV

1 mV

10 mV

100 mV

399.99

3.9999

39.999

399.99

1000.03

0.012% + 5

10.0 MW

11.1 MW

10.1 MW

10.0 MW

Fast 400.0 mV

4.000 V

40.00 V

400.0 V

1000 V

100 µV

1 mV

10 mV

100 mV

1 V

399.9

3.999

39.99

399.9

10003

0.012% + 2

10.0 MW

11.1 MW

10.1 MW

10.0 MW

1. Input impedance is in parallel with capacitance <120 pF.

2. Relative (REL) operation is used.

3. In VDC 1000 V range, 1050 V is readable.

05 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

AC voltage (true RMS, AC coupling mode)

ACV resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)1

30 Hz to 50 Hz 50 Hz to 10 kHz 10 kHz to 30 kHz 30 kHz to 100 kHz

500.00 mV 10 µV 510.00 1% + 40 0.05% + 40 2% + 60 3% + 20

5.0000 V 100 µV 5.1000 1% + 20 0.35% + 15 1% + 20 3% + 50

50.000 V 1 mV 51.000 1% + 20 0.35% + 15 1% + 20 3% + 50

500.00 V 10 mV 510.00 Not specied 0.5% + 15 1% + 2023% + 502

750.0 V 100 mV 1000.0 Not specied 0.5% + 1531% + 202Not specied

1. Accuracy specied at input >5% of full scale.

2. Input voltage <200 V RMS.

3. For 5 kHz to 10 kHz, accuracy is 0.7% + 15.

4. In VAC 750 V range, 1000.0 V RMS is readable with audio warning.

Rate Range Resolution Maximum

reading

Accuracy (1 year; 23 ºC ± 5 ºC)1

20 Hz to 45 Hz 45 Hz to 10 kHz 10 kHz to 30 kHz 30 kHz to 100 kHz

Slow 120.000 mV

1.20000 V

12.0000 V

120.000 V

750.00 V

1 µV

10 µV

100 µV

1 mV

10 mV

119.999

1.19999

11.9999

119.999

750.004

1% + 100

1% + 1002

0.2% + 100

1.5% + 100

1% + 100

5% + 3002

3% + 2002

3% + 2003

Medium 400.00 mV

4.0000 V

40.000 V

400.00 V

750.0 V

10 µV

100 µV

1 mV

10 mV

100 mV

399.99

3.9999

39.999

399.99

750.0

1% + 40

1% + 402

0.2% + 40

1.5% + 80

1% + 40

5% + 1202

3% + 802

3% + 803

Fast 400.0 mV

4.000 V

40.00 V

400.0 V

750 V

100 µV

1 mV

10 mV

100 mV

1 V

399.9

3.999

39.99

399.9

750

1% + 5

1% + 52

0.2% + 5

1.5% + 10

1% + 5

5% + 152

3% + 102

3% + 103

1. Accuracy specied at input >5% of full scale.

2. Input voltage <200 V RMS.

3. Input voltage <500 V RMS.

4. In VAC 750 V range, 787.5 V RMS is readable.

06 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

AC voltage (true RMS, AC+DC coupling mode)

AC+DC voltage resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)1

50 Hz to 10 kHz 10 kHz to 30 kHz 30 kHz to 100 kHz

500.00 mV 10 µV 510.00 0.5% + 50 2% + 70 3% + 130

5.0000 V 100 µV 5.1000 0.5% + 25 1% + 30 3% + 60

50.000 V 1 mV 51.000 0.5% + 25 1% + 30 3% + 60

500.00 V 10 mV 510.00 0.5% + 25 1% + 3023% + 602

750.0 V 100 mV 1000.030.5% + 2541% + 302Not specied

1. Accuracy specied at input >5% of full scale.

2. Input voltage <200 V RMS.

3. In VAC 750 V range, 1000.0 V RMS is readable with audio warning.

4. For 5 kHz to 10 kHz, accuracy is 0.7% + 25.

Rate Range Resolution Maximum

reading

Accuracy (1 year; 23 ºC ± 5 ºC)1

45 Hz to 10 kHz 10 kHz to 30 kHz 30 kHz to 100 kHz

Slow 120.000 mV

1.20000 V

12.0000 V

120.000 V

750.00 V

1 µV

10 µV

100 µV

1 mV

10 mV

119.999

1.19999

11.9999

119.999

750.0002

0.2% + 100

1.5% + 300

1% + 100

5% + 300

3% + 200

3% + 2003

Medium 400.00 mV

4.0000 V

40.000 V

400.00 V

750.0 V

10 µV

100 µV

1 mV

10 mV

100 mV

399.99

3.9999

39.999

399.99

750.00

0.2% + 45

0.2% + 43

1.5% + 83

1% + 43

5% + 125

3% + 83

3% + 833

Fast 400.0 mV

4.000 V

40.00 V

400.0 V

750 V

100 µV

1 mV

10 mV

100 mV

1 V

399.9

3.999

39.99

399.9

750.0

0.2% + 7

1.5% + 12

1% + 7

5% + 18

3% + 12

3% + 123

1. Accuracy specied at input >5% of full scale.

2. In VAC 750 V range, 787.5 V RMS is readable.

3. Input voltage <500 V RMS.

07 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

DC current

DCI resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC) Burden voltage1 and shunt resistor

500.00 µA 10 nA 510.00 0.05% + 5 <0.06 V/100 W

5.0000 mA 100 nA 5.1000 0.05% + 4 <0.6 V/100 W

50.000 mA 1 µA 51.000 0.05% + 4 <0.08 V/1 W

500.00 mA 10 µA 510.00 0.05% + 4 <0.8 V/1 W

5.0000 A 100 µA 5.1000 0.25% + 5 <0.3 V/0.01 W

10.000 A 1 mA 20.00020.25% + 5 <0.6 V/0.01 W

1. Typical at full-scale reading and voltage across the input terminals.

2. In 10 A range, >10 to 20 ADC is readable for 20 seconds maximum with audio warning.

Rate Range Resolution Maximum reading Accuracy

(1 year; 23 ºC ± 5 ºC)

Burden voltage1

and shunt resistor

Slow 12.0000 mA

120.000 mA

1200.00 mA

12.0000 A

0.1 µA

1 µA

10 µA

100 µA

11.9999

119.999

1199.99

11.9999

0.05% + 152

0.05% + 5

0.2% + 5

<0.15 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Medium 40.000 mA

120.00 mA

1200.0 mA

12.000 A

1 µA

10 µA

100 µA

1 mA

39.999

119.99

1199.9

11.999

0.1% + 6

0.1% + 3

0.2% + 3

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Fast 40.00 mA

120.0 mA

1200 mA

12.00 A

10 µA

100 µA

1 mA

10 mA

39.99

119.9

1199

11.99

0.1% + 2

0.2% + 2

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

1. Typical at full-scale reading and voltage across the input terminals.

2. Relative (REL) operation is used.

08 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

AC current (true RMS, AC coupling mode)

ACI resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)1Burden voltage2

and shunt

resistor

30 Hz to 50 Hz 50 Hz to 2 kHz 2 kHz to 5 kHz 5 kHz to 20 kHz

500.00 µA 10 nA 510.00 1.5% + 50 0.5% + 20 1.5% + 50 3% + 753<0.06 V/100 W

5.0000 mA 100 nA 5.1000 1.5% + 40 0.5% + 20 1.5% + 40 3% + 60 <0.6 V/100 W

50.000 mA 1 µA 51.000 1.5% + 40 0.5% + 20 1.5% + 40 3% + 60 <0.08 V/1 W

500.00 mA 10 µA 510.00 1.5% + 40 0.5% + 20 1.5% + 40 3% + 60 <0.8 V/1 W

5.0000 A 100 µA 5.1000 2% + 4040.5% + 20 Not specied Not specied <0.3 V/0.01 W

10.000 A 1 mA 20.00052% + 4040.5% + 30

(<1 kHz)

Not specied Not specied <0.6 V/0.01 W

1. Accuracy specied at input >5% of full scale and >1 A for 10 A range unless otherwise stated.

2. Typical at full-scale reading and voltage across the input terminals.

3. Input current >35 µA RMS.

4. Input current <3 A RMS.

5. In 10 A range, >10 to 20 ADC is readable for 20 seconds maximum with audio warning.

Rate Range Resolution Maximum

reading

Accuracy (1 year; 23 ºC ± 5 ºC)1Burden voltage2

and shunt

resistor

20 Hz to 45 Hz 45 Hz to 2 kHz 2 kHz to 10 kHz

Slow 12.0000 mA

120.000 mA

1200.00 mA

12.0000 A

0.1 µA

1 µA

10 µA

100 µA

11.9999

119.999

1199.99

11.9999

1.5% + 100

2% + 100 (<1.2 A)

0.5% + 100

1% + 100

2% + 200

Not specied

<0.15 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Medium 40.000 mA

120.00 mA

1200.0 mA

12.000 A

1 µA

10 µA

100 µA

1 mA

39.999

119.99

1199.9

11.999

1.5% + 40

1.5% + 12

1.5% + 12 (<1.2 A)

0.5% + 40

0.5% + 12

1% + 12

2% + 80

2% + 30

Not specied

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Fast 40.00 mA

120.0 mA

1200 mA

12.00 A

10 µA

100 µA

1 mA

10 mA

39.99

119.9

1199

11.99

1.5% + 5

1.5% + 2

2% + 2 (<1.2 A)

0.5% + 5

0.5% +2

1% +2

2% + 10

2.2% + 5

Not specied

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

1. Accuracy specied at input >5% of full scale.

2. Typical at full-scale reading and voltage across the input terminals.

09 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

AC current (true RMS, AC+DC coupling mode)

AC+DC current resolution, full-scale reading and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)1Burden voltage2

and shunt

resistor

50 Hz to 2 kHz 2 kHz to 5 kHz 5 kHz to 20 kHz

500.00 µA 10 nA 510.00 0.5% + 30 1.5% + 60 3% + 853<0.06 V/100 W

5.0000 mA 100 nA 5.1000 0.5% + 30 1.5% + 50 3% + 70 <0.6 V/100 W

50.000 mA 1 µA 51.000 0.5% + 30 1.5% + 50 3% + 70 <0.08 V/1 W

500.00 mA 10 µA 510.00 0.5% + 30 1.5% + 50 3% + 70 <0.8 V/1 W

5.0000 A 100 µA 5.1000 0.5% + 30 Not specied Not specied <0.3 V/0.01 W

10.000 A 1 mA 20.00040.5% + 40 (<1 kHz) Not specied Not specied <0.6 V/0.01 W

1. Accuracy specied at input >5% of full scale and >1 A for 10 A range unless otherwise stated.

2. Typical at full-scale reading and voltage across the input terminals.

3. Input current >35 µA RMS.

4. In 10 A range, >10 to 20 ADC is readable for 20 seconds maximum with audio warning.

Rate Range Resolution Maximum

reading

Accuracy (1 year; 23 ºC ± 5 ºC)1Burden voltage2

and shunt resistor

45 Hz to 2 kHz 2 kHz to 10 kHz

Slow 12.0000 mA

120.000 mA

1200.00 mA

12.0000 A

0.1 µA

1 µA

10 µA

100 µA

11.9999

119.999

1199.99

11.9999

0.5% + 100

1% + 100

2% + 200

Not specied

<0.15 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Medium 40.000 mA

120.00 mA

1200.0 mA

12.000 A

1 µA

10 µA

100 µA

1 mA

39.999

119.99

1199.9

11.999

0.5% + 42

0.5% + 15

1% + 15

2% + 80

2% + 30

Not specied

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

Fast 40.00 mA

120.0 mA

1200 mA

12.00 A

10 µA

100 µA

1 mA

10 mA

39.99

119.9

1199

11.99

0.5% + 7

0.5% + 4

1% + 4

2% + 12

2% + 7

Not specied

<0.5 V/10 W

<1.5 V/10 W

<0.3 V/0.1 W

<0.6 V/0.01 W

1. Accuracy specied at input >5% of full scale.

2. Typical at full-scale reading and voltage across the input terminals.

10 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Resistance

Resistance resolution, full scale reading, and accuracy [± (% of reading + count)]

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range1Resolution Maximum reading Test current Accuracy (1 year; 23 ºC ± 5 ºC)

500.00 W10 mW 510.00 0.5 mA 0.1% + 52

5.0000 kW 100 mW 5.1000 0.45 mA 0.1% + 32

50.000 kW1 W 51.000 45 µA 0.1% + 3

500.00 kW 10 W510.00 4.5 µA 0.1% + 3

5.0000 MW100 W5.1000 450 nA 0.1% + 3

50.000 MW1 kW 51.000 45 nA 0.3% + 3

1. To reduce noise interference that may be induced by the test leads, we recommend using a shielded test cable for measuring resistances above 500 kW.

2. Relative (REL) operation is used.

Rate Range1 Resolution Maximum

reading

Test current Accuracy (1 year; 23 ºC ± 5 ºC)

2-wire 4-wire

Slow 120.000 W

1.20000 kW

12.0000 kW

120.000 kW

1.20000 MW

12.0000 MW

120.000 MW

1 mW

10 mW

100 mW

1 W

10 W

100 W

1 kW

119.999

1.19999

11.9999

119.999

1.19999

11.9999

119.999

0.5 mA

100 µA

10 µA

1 µA

100 nA

10 nA

0.1% + 82

0.08% + 52

0.06% + 52

0.06% + 5

0.3% + 5

3% + 8

0.05% + 82

0.05% + 52

0.05% + 5

0.3% + 5

3% + 8

Medium 400.00 W

4.0000 kW

40.000 kW

400.00 kW

4.0000 MW

40.000 MW

300.00 MW

10 mW

100 mW

1 W

10 W

100 W

1 kW

10 kW

399.99

3.9999

39.999

399.99

3.9999

39.999

299.99

0.5 mA

100 µA

50 µA

5 µA

500 nA

50 nA

10 nA

0.1% + 52

0.08% + 32

0.06% + 3

0.15% + 3

1.5% + 3

5.0% + 5

0.05% + 52

0.05% + 3

0.15% + 3

1.5% + 3

5.0% + 5

Fast 400.0 W

4.000 kW

40.00 kW

400.0 kW

4.000 MW

40.00 MW

300.0 MW

100 mW

1 W

10 W

100 W

1 kW

10 kW

100 kW

399.9

3.999

39.99

399.9

3.999

39.99

299.9

0.5 mA

100 µA

50 µA

5 µA

500 nA

50 nA

10 nA

0.1% + 22

0.08% + 2

0.06% + 2

0.15% + 2

1.5% + 2

5.0% + 2

0.05% + 2

0.15% + 2

1.5% + 2

5.0% + 2

1. To reduce noise interference that may be induced by the test leads, we recommend using a shielded test cable for measuring resistances above 100 kW.

2. Relative (REL) operation is used.

11 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Frequency

Frequency resolution, full-scale reading and accuracy [± (% of reading + count)]

Diode test/continuity

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)

2.3000 V 100 µV 2.3000 V 0.05% + 5

Rate Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)

Slow 1.19999 V 10.0000 µV 0.012% + 5

Medium 2.4999 V 100.00 µV 0.012% + 5

Fast 2.499 V 1.000 mV 0.012% + 2

Range Input sensitivity for voltage measurement (sine-wave)

5 Hz to 100 kHz 100 kHz to 500 kHz

500 mV 35 mV RMS 200 mV RMS

5 V 0.25 V RMS 0.5 V RMS

50 V 2.5 V RMS 5 V RMS

500 V 25 V RMS Not specied

750 V 50 V RMS Not specied

Range Measurement range Resolution Maximum reading Accuracy (1 year; 23 ºC ± 5 ºC)

500.00 Hz 5 Hz to 500 Hz 0.01 Hz 510.00 0.01% + 5

5.0000 kHz 500 Hz to 5 kHz 0.1 Hz 5.1000 0.01% + 3

50.000 kHz 5 kHz to 50 kHz 1 Hz 51.000 0.01% + 3

500.00 kHz 50 kHz to 500 kHz 10 Hz 999.99 0.01% + 3

Range Measurement range Resolution Maximum reading Accuracy

(1 year; 23 ºC ± 5 ºC)1

Input sensitivity

(sine wave)

1200.00 Hz 5 Hz to 1200 Hz 10 mHz 1199.99 0.005% + 3 40 mV RMS

12.0000 kHz 10 Hz to 12 kHz 100 mHz 11.9999 0.005% + 2 40 mV RMS

120.000 kHz 100 Hz to 120 kHz 1 Hz 119.999 0.005% + 2 40 mV RMS

1.0000 MHz 1 kHz to 1 MHz 10 Hz 1.1999 0.005% + 2 0.5 V RMS

1. Specied accuracy at input >5% of full scale.

12 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Decibel (dB) calculation

Range and accuracy (±dB)

U3401A 4.5-digit DMM

U3402A 5.5-digit DMM

Voltage range1, 2 Input voltage dBm3 range at 600 W ref Accuracy (1 year; 23 ºC ± 5 ºC)

30 Hz to 50 Hz 50 Hz to 10 kHz 10 kHz to 100 kHz

500.00 mV 20 mV to 500 mV –29.82 to –3.80 0.3 0.3 0.7

5.0000 V 5000 mV to 5 V –3.80 to 16.20 0.2 0.2 0.5

50.000 V 5 V to 50 V 16.20 to 36.20 0.2 0.2 0.5

500.00 V 50 V to 500 V 36.20 to 56.20 0.240.2 0.54

1000.0 VDC 500 V to 1000 V 56.20 to 62.22 Not specied 0.25Not specied

750.0 VAC 500 V to 750 V 56.20 to 59.72 Not specied 0.25Not specied

1. Auto ranging is used when dBm operation is selected.

2. In VDC 1000 V range, 1200 V is readable. In VAC 750 V range, 1000 V is readable.

3. Reading is displayed in dB when relative (REL) operation is used.

4. Input voltage <200 V RMS.

5. For input voltage within the frequency range of 50 Hz to 1 kHz.

Rate Voltage range 1, 2 Input voltage dBm3 range

at 600 W ref

Accuracy (1 year; 23 ºC ± 5 ºC)

20 Hz to 45 Hz 45 Hz to 10 kHz 10 kHz to 100 kHz

Slow 120.000 mV

1.20000 V

12.0000 V

120.000 V

1000.00 VDC

750.00 V

6 mV to 120 mV

120 mV to 1.2 V

1.2 V to 12 V

12 V to 120 V

120 V to 1000 V

120 V to 750 V

–42.20 to –16.20

–16.20 to 3.80

3.80 to 23.80

23.80 to 43.80

43.80 to 62.22

43.80 to 59.72

1.0

0.8

Not specied

0.2

0.1

1.04

1.0

0.8

Not specied

Medium 400.00 mV

4.0000 V

40.000 V

400.00 V

1000.0 VDC

750.0 V

20 mV to 400 mV

400 mV to 4 V

4 V to 40 V

40 V to 400 V

400 V to 1000 V

400 V to 750 V

–31.76 to –5.74

–5.74 to 14.26

14.26 to 34.26

34.26 to 54.26

54.26 to 62.22

54.26 to 59.72

1.0

0.8

Not specied

0.2

0.1

1.04

1.0

0.8

Not specied

Fast 400.0 mV

4.000 V

40.00 V

400.0 V

1000 VDC

750 V

20 mV to 400 mV

400 mV to 4 V

4 V to 40 V

40 V to 400 V

400 V to 1000 V

400 V to 750 V

–31.76 to –5.74

–5.74 to 14.26

14.26 to 34.26

34.26 to 54.26

54.26 to 62.22

54.26 to 59.72

1.0

0.8

Not specied

0.2

0.1

1.04

1.0

0.8

Not specied

1. Auto ranging is used when dBm operation is selected.

2. In VAC 750 V range, 5% over-range is readable.

3. Reading is displayed in dB when relative (REL) operation is used.

4. For input voltage within the frequency range of 45 Hz to 1 kHz.

13 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Full-scale display counts

Supplemental measurement specications

Supplemental specications

Model Reading rate Display counts

U3401A N/A 51,000

U3402A Slow 120,000

Medium 40,000

Fast 4,000

Measurement Specication

DC voltage Measurement method Sigma Delta A-to-D converter

Input resistance 10 MW ± 2% range (typical)

Maximum input voltage 1000 VDC or PEAK AC on all ranges

Input protection 1000 V on all ranges

Response time Approximately 1.0 second when the displayed reading reaches 99.9% DC value of the tested input

signal at the same range

DC current Shunt resistance U3401A

–0.01 W to 100 W for 500 µA to 10 A ranges

U3402A

–0.1 W to 10 W for 12 mA to 1.2 A ranges

–0.01 W for 12 A range

Maximum input and

overload protection

(U3402A only)

mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FB fuse

12 A input terminal: 10 ADC or AC RMS continuous; or 12 ADC or AC RMS for 30 seconds maximum.

Protected with 15 A/600 V, breaking capacity 10,000 A FB fuse

Response time Approximately 1.0 second when the displayed reading reaches 99.9% DC value of the tested input

signal at the same range

AC voltage Measurement method AC-coupled true RMS: measures the AC component with up to 400 VDC bias on any range

Crest factor Maximum 3:0 at full scale

Input impedance U3401A: 1 MW in parallel with <100 pF

U3402A: 1 MW ± 2% in parallel with <120 pF

Maximum input voltage U3401A: 1000 V RMS/1400 V PEAK

U3402A: 750 V RMS/1200 V PEAK

2x107 V-Hz product on any range, normal mode input

1x106 V-Hz product on any range, common mode input

Overload ranging Selects higher range if peak input overload is detected during auto range. Overload is reported in

manual ranging

Input protection U3401A: 1000 V RMS on all ranges

U3402A: 750 V RMS on all ranges

Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested

input signal at the same range.

14 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Supplemental measurement specications (continued)

Measurement Specication

AC+DC

voltage

Measurement method AC+DC coupled true RMS: measures the AC component with up to 400 VDC bias on any range

Crest factor Maximum 3:0 at full scale

Input impedance U3401A: 1 MW in parallel with <100 pF

U3402A: 1 MW ± 2% in parallel with <120 pF

Maximum input voltage U3401A: 1000 V RMS/1400 V PEAK

U3402A: 750 V RMS/1100 V PEAK

2x107 V-Hz product on any range, normal mode input

1x106 V-Hz product on any range, common mode input

Overload ranging Selects higher range if peak input overload is detected during auto range. Overload is reported in

manual ranging

Input protection U3401A: 1000 V RMS on all ranges

U3402A: 750 V RMS on all ranges

Response time Approximately 1.5 seconds (2.5 seconds for U3402A) when the displayed reading reaches 99.9% AC

RMS value of the tested input signal at the same range

AC current Measurement method DC coupled to the fuse and current shunt, AC coupled true rms measurement (measures the AC

component only)

Crest factor Maximum 3:0 at full scale

Shunt resistance U3401A

–0.01 W to 100 W for 500 µA to 10 A ranges

U3402A

–0.1 W to 10 W for 10 mA to 1.2 A ranges

–0.01 W for 12 A range

Input protection U3401A

Front panel fuse 630 mA, 500 V; internal 25 A, 440 V

U3402A

mA input terminal: 1200 mADC or AC RMS. Protected with 1.25 A/500 V, IEC-127 sheet, FH fuse

12 A input terminal: 10 ADC or AC RMS continuous; or 12 ADC or AC RMS for 30 seconds maximum.

Protected with 15 A/600 V, breaking capacity 10,000 A FH fuse

Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested

input signal at the same range

AC+DC

current

Measurement method AC+DC coupled to the fuse and current shunt, AC+DC coupled true rms measurement

(measures the AC component only)

Crest factor Maximum 3:0 at full scale

Measurement range Vdc and Vac are automatically set at the same range

Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% AC RMS value of the tested

input signal at the same range

Resistance Measurement method U3401A: 2-wire ohms

U3402A: 2-wire ohms or 4-wire ohms

Open-circuit voltage U3401A: Limited to <+6 VDC

U3402A: Limited to <+5 VDC

Zeroing error 0.05 W or less (excluding test lead resistance) in each range when Relative operation is used

15 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Supplemental measurement specications (continued)

Measurement Specication

Resistance Input protection 500 V

Response time U3401A

–Approximately 1.5 seconds for 5 MW and ranges below 5 MW

U3402A

–Approximately 1.5 seconds for 12 MW and ranges below 12 MW

–Approximately 5 seconds for 40 MW

–Approximately 10 seconds for 120 MW

–Approximately 23 seconds for 300 MW

Diode/

Continuity

Measurement method U3401A: 0.5mA +/- 0.2% constant current source, open circuit voltage limited to <6V.

U3402A: 0.5mA +/- 0.2% constant current source, open circuit voltage limited to <5V.

Test current Approximately 0.5 mADC

Open-circuit voltage U3401A: Limited to <+6 VDC

U3402A: Limited to <+5 VDC

Continuity threshold 10 W xed

Continuity level Approximately <+50 mVDC

Audible tone Continuous beep for continuity and single tone for normal forward-biased diode or semiconductor

junction

Input protection 500 V

Resistance/

Continuity

(U3402A only)

Measurement method 2-wire ohms

Test current Approximately 0.5 mADC

Open-circuit voltage Limited to <+5 VDC

Audible tone Continuous beep for continuity and single tone for normal forward-biased diode or semiconductor

junction

Zeroing error 0.05 W or less (excluding test lead resistances) in each range when Relative operation is used

Input protection 500 V

Frequency Measurement method Reciprocal counting technique. AC coupled input using AC voltage function

Crest factor Maximum 3:0 at full scale

Signal level 10% of range to full-scale input on all ranges; auto or manual range selection

Gate time 0.1 second or 1 period of the input signal, whichever is longer

Input impedance U3401A: 1 MW in parallel with <100 pF

U3402A: 1 MW ± 2% in parallel with <120 pF

Maximum input voltage U3401A: 1000 V RMS/1400 V PEAK

U3402A: 750 V RMS/1100 V PEAK

2x107 V-Hz product on any range, normal mode input

1x106 V-Hz product on any range, common mode input

Input protection 750 V RMS on all ranges

Response time Approximately 1.5 seconds when the displayed reading reaches 99.9% of frequency value

Noise

rejection

Common mode rejection

ratio (CMRR) for 1 kW

unbalanced LO lead

50/60 Hz ± 0.1%: DC >90 dB

Normal mode rejection

ratio (NMRR)

50/60 Hz ± 0.1%: >50 dB

16 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Supplemental measurement specications (continued)

Measurement Specication

dBm

operation

0 dBm 1 mW at 600 W reference impedance

Resolution U3401A

0.01 dB for all ranges

U3402A

Slow: 0.01 dB for all ranges

Medium: 0.01 dB for all ranges

Fast: 0.1 dB for all ranges

Reference impedance12 W2, 4 W 2, 8 W2, 16 W2, 50 W, 75 W, 93 W, 110 W, 124 W, 125 W, 135 W, 150 W, 250 W, 300 W,

500 W, 600 W, 800 W, 900 W, 1000 W, 1200 W, 8000 W

Math operation U3401A: dBm, Relative, Min/Max, Compare, Hold, Percentage

U3402A: dBm, Relative, Min/Max, Compare, Hold

I/O interface RS-232 (for calibration use only)

1. Reference impedance is displayed on the secondary display.

2. Reading is displayed in watts (audio power).

17 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

 



General characteristics

Power supply

– 100 V/120 V/220 V/240 V ± 10%

– AC line frequency 50 Hz to 60 Hz

Power consumption

16 VA maximum

Input power option

Manual-ranging (100 VAC to

240 VAC ± 10%)

Fuse

U3401A

Terminal: 25 A, 440 V FB fuse; 0.63 A,

500 V FB fuse

Power line: 0.25 A, 250 V SB fuse, or

0.125 A, 250 V SB fuse

U3402A

Terminal: 15 A, 600 V FB fuse; 1.25 A,

500 V FB fuse

Power line: 0.25 A, 250 V SB fuse, or

0.125 A, 250 V SB fuse

Display

Highly visible vacuum uorescent

display (VFD)

Operating environment

– Operating temperature from 0 °C to

+50 °C

– Relative humidity up to 80% at 28 °C

– (non-condensing)

– Altitude up to 2000 meters

– Pollution degree 2

– For indoor use only

Storage compliance

––20 °C to 60 °C

–Relative humidity at 5% to 90% RH

– (non-condensing)

Safety compliance

– IEC 61010-1:2001/EN61010-1:2001

– (2nd Edition)

– Canada: CAN/CSA-C22.2 No. 61010-

1-04

– USA: ANSI/UL 61010-1:2004

EMC compliance

– IEC 61326-1:2005/EN61326-1:2006

– Canada: ICES/NMB-001:2004

– Australia/New Zealand: AS/NZS

– CISPR11:2004

Shock and vibration

Tested to IEC/EN 60068-2

I/O connector

Output connectors

I/O interface

RS-232 (for calibration use only)

Dimensions (W × H × D)

255 mm × 105 mm × 305 mm (with bum-

pers)

215 mm x 87 mm x 282 mm (without

bumpers)

Weight

3.44 kg (with bumpers)

Warranty

Three years for U3401A/U3402A

Three months for standard shipped acces-

sories

Calibration cycle

One year

Warm-up time

At least 30 minutes

18 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

34138A Test Lead Kit U1161A Extended Test Lead Kit 34330A Current Shunt (30 A)

34133A Precision Electronic

Test Leads

11059A Kelvin Probe Set U34 00A-1CM Rack Mount Kit

Each U3400 Series includes these standard shipped accessories:

– Quick Start Guide

– Product Reference CD

– Certicate of Calibration

– 34138A Test Lead Kit

– AC Power Cord

Accessories

Ordering Information

19 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

Some of the best equations express large ideas with elegant simplicity. The same is true with

the Keysight Technologies, Inc. U3401A and U3402A dual-display DMMs. When you need basic

capabilities with good performance at 4½ or 5½ digits, respectively, these affordable benchtop

units make the grade in educational, electronics and communications applications. For extra

credit, they also include a PC-grade lock slot for physical security. The U3400 Series: basic, good

capability in an elegantly simple DMM.

myKeysight

www.keysight.com/find/mykeysight

A personalized view into the information most relevant to you.

www.axiestandard.org

AdvancedTCA® Extensions for Instrumentation and Test (AXIe) is an

open standard that extends the AdvancedTCA for general purpose and

semiconductor test. Keysight is a founding member of the AXIe consortium.

ATCA®, AdvancedTCA®, and the ATCA logo are registered US trademarks of

the PCI Industrial Computer Manufacturers Group.

www.lxistandard.org

LAN eXtensions for Instruments puts the power of Ethernet and the

Web inside your test systems. Keysight is a founding member of the LXI

consortium.

www.pxisa.org

PCI eXtensions for Instrumentation (PXI) modular instrumentation delivers a

rugged, PC-based high-performance measurement and automation system.

Three-Year Warranty

www.keysight.com/find/ThreeYearWarranty

Keysight’s commitment to superior product quality and lower total cost

of ownership. The only test and measurement company with three-year

warranty standard on all instruments, worldwide.

Keysight Assurance Plans

www.keysight.com/find/AssurancePlans

Up to five years of protection and no budgetary surprises to ensure your

instruments are operating to specification so you can rely on accurate

measurements.

www.keysight.com/go/quality

Keysight Technologies, Inc.

DEKRA Certified ISO 9001:2008

Quality Management System

Keysight Channel Partners

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Get the best of both worlds: Keysight’s measurement expertise and product

breadth, combined with channel partner convenience.

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For more information on Keysight

Technologies’ products, applications or

services, please contact your local Keysight

office. The complete list is available at:

www.keysight.com/find/contactus

Americas

Canada (877) 894 4414

Brazil 55 11 3351 7010

Mexico 001 800 254 2440

United States (800) 829 4444

Asia Pacic

Australia 1 800 629 485

China 800 810 0189

Hong Kong 800 938 693

India 1 800 112 929

Japan 0120 (421) 345

Korea 080 769 0800

Malaysia 1 800 888 848

Singapore 1 800 375 8100

Taiwan 0800 047 866

Other AP Countries (65) 6375 8100

Europe & Middle East

Austria 0800 001122

Belgium 0800 58580

Finland 0800 523252

France 0805 980333

Germany 0800 6270999

Ireland 1800 832700

Israel 1 809 343051

Italy 800 599100

Luxembourg +32 800 58580

Netherlands 0800 0233200

Russia 8800 5009286

Spain 0800 000154

Sweden 0200 882255

Switzerland 0800 805353

Opt. 1 (DE)

Opt. 2 (FR)

Opt. 3 (IT)

United Kingdom 0800 0260637

For other unlisted countries:

www.keysight.com/find/contactus

(BP-09-04-14)

20 | Keysight | U3400 Series 4½ and 5½ Digit Digital Multimeters - Data Sheet

This information is subject to change without notice.

Published in USA, July 31, 2014

5990-3970EN