USB390A - B&K PRECISION

High performance and value priced, the Test

Bench®Series offers more features for the dollar

than other multimeters. These meters include

Component Test capabilities, Resistance, Diode

Test and Capacitance, in addition to measuring

Frequency, Temperature and a Logic Indicator.

See the chart below for the meter that best fits

your needs. Dual injection molding process

allows a better grip and protection for the

meters. CE marked and UL listed.

Features and Benefits

■Resistance measurement

■Diode check

■Frequency measurement

■Audible continuity

■All current ranges fused

■Ruggedized case

■Auto power off

■Designed to meet IEC61010-1

CATIII 1000V, class 2

Test Bench®, High Performance DMM

Models 388B, 389A, 390A & 391A

Data Sheet

www.bk prec ision.c om

Technical data subject to change

High Quality,

Ruggedized,

Multifunction

391A 388B

389A

390A

Features 391A 390A 389A 388B

Basic Functions

True RMS √

Ranging Manual Auto/Manual Auto/Manual Manual

DCV Accuracy 0.05% 0.1% 0.25% 0.5%

AC/DC Voltage and Current √ √ √ √

Display Digits, Count 4 1/2, 20000 3 3/4, 4000 3 3/4, 4000 3 3/4, 4000

Bar Graph (41 Segment) √ √

Capacitance Measurement √ √ √

Transistor Test √

Temperature Probe √

Logic Probe √ √

Relative Mode √ √

Min/Max Hold √ √

Peak Hold √ √

Data Hold √ √ √

USB √

Specifications 391A 390A 389 388B

Volts True RMS reading

DC Ranges 200mV, 2V, 20V, 200V, 1,000V 400mv, 4V, 40V, 400V, 1000V

AC Ranges 200mV, 2V, 20V, 200V, 750V 400mv, 4V, 40V, 400V, 750V

Resolution 10µV, 100mV, 1 mV 10mV, 100mV 100µV, 1mV, 10mV, 100mV, 1V

DC Accuracy ±(0.05% + 3 dgt) ±(0.1% rdg + 2 dgt) ±(0.25% rdg + 2 dgt) ±(0.5% rdg + 1 dgt)

AC Accuracy ±(1% +10 dgt.) 50Hz-500Hz 400mV: ±(1.2% rdg+ 5 dgt) ±(1.2% rdg+ 4 dgt)

±(2% + 10 dgt.) 500Hz - 2kHz, 50Hz-100Hz 750V: ±(2% rdg+ 4 dgt)

500Hz on 750Vrange ±(1.0% rdg + 3 dgt) 50Hz-500Hz >10% of range at 200mV range ±(1.5% rdg + 3 dgt) 500Hz-1kHz

Overload Protection 1200VDC or AC rms 1100VDC or AC rms 1200VDC or AC rms

500VDC/AC rms 15 sec 500VDC/AC rms 15 sec

on 200mV range on 200mV range

Input Impedance 10MΩ400mV: >100MΩ, 4V: 10MΩ, 40V - 1000V: 9.1MΩ10MΩ

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Test Bench, High Performance DMM

Models 388B, 389A, 390A & 391A

v040611

Specifications 391A 390A 389A 388B

Current True RMS reading

Ranges 200µA, 2mA, 20mA, 200mA, 20A* 400µA, 4mA, 40mA, 400mA, 20A* 400mA, 4mA, 40mA, 400mA, 2A, 20A*

Resolution 10nA, 100nA, 1µA, 10µA, 1mA 0.1µA, 1µA, 10µA, 100µA, 10µA 100nA, 1µA, 10µA,100µA,1mA,10mA

DC Accuracy 200µA to200mA:±(0.5% rdg + 5 dgt.)

20A: ±(2% rdg + 10 dgt.)

400µA - 400mA:±(1% rdg + 5dgt)

20A: ±(2% rdg + 3 dgt)

±(1% rdg + 1 dgt)

±(2% rdg + 3dgt)

400µA - 400mA: ±(1% rdg + 1 dgt)

2A: ±(1.5% rdg + 1 dgt)

20A: ±(3% rdg + 3 dgt)

AC Accuracy 200µA to200mA:±(1.2% rdg + 10 dgt.)

20A: ±(2.5% rdg + 20 dgt.)

400µA to 400mA:±(1.5% rdg + 4 dgt)

20A: ±(2.5% rdg + 4 dgt.)

400µA - 400mA:±(1.5% rdg + 1 dgt)

2A: ±(2% rdg + 4 dgt)

20A: ±(3.5% rdg + 4 dgt)

Input Protection µA/mA input:0.5A/500V fast blow ceramic fuse

20A input: 20A/600A fast blow ceramic fuse

µA/mA input: 0.5A/500V fast blow ceramic fuse

20A input: 20A/600A fast blow ceramic fuse

µA/mA input: 2A/600V fast blow ceramic fuse

20A input: 20A/600V fast blow ceramic fuse

Max. Burden Voltage 600mV (900mV on 20A range) 500mV (2V on 4mA, 400mA ranges) 600mV (900mV on 2A, 20A ranges)

Resistance

Ranges 200Ω; 2kΩ, 20kΩ, 200kΩ; 2MΩ, 20MΩ400Ω, 4kΩ, 40kΩ, 400kΩ, 4MΩ, 40MΩ

Resolution 10mΩ, 100mΩ, 1Ω, 10Ω, 100Ω, 1kΩ100mΩ, 1Ω, 10Ω, 100Ω, 1kΩ, 10kΩ

Accuracy

200Ω, 2MΩ: ±(0.25% rdg + 10 dgt.)

2kΩ to 200kΩ: ±(0.15% rdg + 3 dgt.)

20MΩ: ±(1.0% + 10 dgt.)

400Ω to 400kΩ: ±(0.5% rdg + 4 dgt.)

4MΩ: ±(1% rdg + 5 dgt.)

40MΩ: ±(2% rdg + 5 dgt.)

400Ω: ±(1% rdg + 4 dgt.)

4kΩ to 4MΩ: ±(0.8% rdg + 4 dgt.)

40MΩ: ±(2% rdg + 5 dgt.)

Open Circuit Voltage 3.2VDC typ. -0.45VDC typ. (-1.2VDC on 400Ω range) 0.6VDC typ. (3.2VDC on 400Ω range)

Overload Protection 500VDC or ACrms

Diode Test T

ested at 1mA, 3.2VDC max. type.

±(1% rdg + 10 dgt.) accuracy

ested at 1.2mA, 3.0VDC max. type.

±(1.5% rdg + 3 dgt.) accuracy

ested at 1mA, 3.2VDC max. type.

±(1.5% rdg + 3 dgt.) accuracy

Transistor Test (hFE) Does not apply Does not apply hFE range: 0 - 1000, hFE base current: 10µADC

Capacitance

Ranges Does not apply 4nF. 40nF, 400nF, 4µF, 40µF, 400µF, 4mF, 40mF 4nF. 40nF, 400nF, 4µF, 40µF

Resolution 1pF, 10pF, 100pF, 1nF, 10nF, 100nF, 1µF, 10µF 0.1pF, 1pF, 10pF, 100pF, 1nF

Accuracy 4nF: ±(3% rdg + 20 dgt.) 4nF to 40µF: ±(3% rdg + 5 dgt.)

400µFto 40mF: ±(5% rdg + 10 dgt.)

±(3% rdg + 4 dgt.)

Test Voltage <1V <3.5V

Overload Protection 500VDC or AC rms

Frequency

Ranges 2kHz, 20kHz, 200kHz 4kHz, 40kHz, 400kHz, 4MHz, 40MHz 4kHz, 40kHz, 400kHz, 4MHz

Resolution 0.1 Hz, 1Hz, 10Hz 1Hz, 10Hz, 100Hz, 10kHz, 100kHz 1Hz, 10Hz, 100Hz, 10kHz

Accuracy ±(0.1% rdg + 3 dgt.) ±(0.1% rdg + 3 dgt.) ±(0.25% + 4 Digits) ±(0.1% + 2 Digits)

Sensitivity 50mVrms min. (@>30 & <70% duty

cycle: 400mVrms min.)

1Hz - 4MHz: 1Vrms

4MHz - 40MHz: >2Vrms, <5Vrms

250mVrms min. on 10Hz to 1MHz

500mVrms min. on 1MHz to 4MHz

Minimum Pulse Width >25ns >25ns >2µs

Duty Cycle Limits >30% & <70% >30% & <70%

Minimum Input Range 2kHz:10Hz:20kHz:>60dgt; 200kHz>60dgt

Overload Protection 500VDC or AC rms 500VDC or AC rms

Logic Test

Logic Threshold Hi=2.8±0.8V, 0=0.8 ± 0.5V Does not apply Does not apply Hi=2.8±0.8V, 0=0.8 ± 0.5V

Frequency Response 20MHz 20MHz

Pulse Width 25ns 25ns

Pulse Limits >20% and <80% >20% and <80%

Indication 40m sec beep at logic 1 (Hi) 40m sec beep at logic 1 (Hi)

Overload Protection 500V DC or ACrms 500V DC or ACrms

Temperature

Range, Resolution Does not apply -58° to +2372°F, 1F°, (-50°to + 1300°C, 1C°) Does not apply Does not apply

Accuracy ±(0.8% rdg + 2°C) -50° - 400°C, ±(1% rdg + 2°C) 400° - 1300°C

Duty Cycle

Range, Resolution 0 to 90%, 0.1% Does not apply Does not apply Does not apply

Accuracy (5V logic) ±(2.0% rdg + 10 dgt.)

Minimum Pulse Width 10µs

Frequency Range 40Hz to 20kHz

Overload Protection 500VDC or AC rms

General

Display 20000 count, 4 1/2 digit LCD 4000 count, 3 3/4 digit LCD with 41 segment analog bar graph 4000 count, 3 3/4 digit LCD

Polarity Automatic, positive implied, negative polarity indication

Operating Temperature 32° to 122° (0˚ to 50˚C), 0 to 70% R.H.

Dimensions (HxWxD) 7.8 x 3.5 x 1.57" (198 x 90 x 40mm)

Weight 11.3 oz. (320g).

Three Year Warranty

SUPPLIED ACCESSORIES: 9 Volt Battery, Test Leads, Instruction Manual, Thermocouple Probe (Model 390A), Software and USB Interface Cable (Model 390A)

OPTIONAL ACCESSORIES: TL 2A Deluxe Test Leads, TL 3 Accessory Tip Kit (for TL 2A), PR 28A High Voltage Probe (40kVDC), TL 130A General Purpose DMM Kit, Carrying Case (not included): LC 29B

* 10 A continuous, 20 A for 30 seconds maximum