Data Sheet Test Bench(R), High Performance DMM Models 388B, 389A, 390A & 391A High Quality, Ruggedized, Multifunction High performance and value priced, the Test Bench(R) 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. Fe atures 388B 389A 390A 391A 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 4 1/2, 20000 3 3/4, 4000 3 3/4, 4000 3 3/4, 4000 Features and Benefits Resistance measurement Diode check Display Digits, Count Frequency measurement Audible continuity Capacitance Measurement All current ranges fused Transistor Test Ruggedized case Temperature Probe Auto power off Designed to meet IEC61010-1 Bar Graph (41 Segment) Logic Probe CATIII 1000V, class 2 Relative Mode Min/Max Hold Peak Hold Data Hold USB Spe cifications 391A Volts 390A 389 388B True RMS reading DC Ranges 200mV, 2V, 20V, 200V, 1,000V AC Ranges 200mV, 2V, 20V, 200V, 750V 400mv, 4V, 40V, 400V, 1000V 400mv, 4V, 40V, 400V, 750V Resolution 10V, 100mV, 1 mV 10mV, 100mV 100V, 1mV, 10mV, 100mV, 1V DC Accuracy (0.05% + 3 dgt) (0.1% rdg + 2 dgt) AC Accuracy (1% +10 dgt.) 50Hz-500Hz 400mV: (1.2% rdg+ 5 dgt) (2% + 10 dgt.) 500Hz - 2kHz, Overload Protection (0.25% rdg + 2 dgt) (1.2% rdg+ 4 dgt) 50Hz-100Hz 500Hz on 750Vrange (1.0% rdg + 3 dgt) 50Hz-500Hz 1200VDC or AC rms 1100VDC or AC rms 750V: (2% rdg+ 4 dgt) >10% of range at 200mV range (1.5% rdg + 3 dgt) 500Hz-1kHz 1200VDC or AC rms 500VDC/AC rms 15 sec 500VDC/AC rms 15 sec on 200mV range Input Impedance Technical data subject to change (c) B&K Precision Corp. 2011 10M (0.5% rdg + 1 dgt) on 200mV range 400mV: >100M, 4V: 10M, w w w.bk prec ision.c om 40V - 1000V: 9.1M 10M Test Bench, High Performance DMM Models 388B, 389A, 390A & 391A Specifications Current 391A 390A 389A 388B True RMS reading Ranges 200A, 2mA, 20mA, 200mA, 20A* 400A, 4mA, 40mA, 400mA, 20A* 400mA, 4mA, 40mA, 400mA, 2A, 20A* Resolution 10nA, 100nA, 1A, 10A, 1mA 0.1A, 1A, 10A, 100A, 10A 100nA, 1A, 10A,100A,1mA,10mA DC Accuracy 200A to200mA:(0.5% rdg + 5 dgt.) 20A: (2% rdg + 10 dgt.) AC Accuracy 200A to200mA:(1.2% rdg + 10 dgt.) 20A: (2.5% rdg + 20 dgt.) 400A to 400mA:(1.5% rdg + 4 dgt) 20A: (2.5% rdg + 4 dgt.) 400A - 400mA:(1.5% rdg + 1 dgt) 2A: (2% rdg + 4 dgt) 20A: (3.5% rdg + 4 dgt) Input Protection A/mA input:0.5A/500V fast blow ceramic fuse 20A input: 20A/600A fast blow ceramic fuse A/mA input: 0.5A/500V fast blow ceramic fuse 20A input: 20A/600A fast blow ceramic fuse A/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) 400A - 400mA:(1% rdg + 5dgt) 20A: (2% rdg + 3 dgt) (1% rdg + 1 dgt) (2% rdg + 3dgt) 400A - 400mA: (1% rdg + 1 dgt) 2A: (1.5% rdg + 1 dgt) 20A: (3% rdg + 3 dgt) R esistance Ranges 200; 2k, 20k, 200k; 2M, 20M Resolution 10m, 100m, 1, 10, 100, 1k Accuracy 200, 2M: (0.25% rdg + 10 dgt.) 2k to 200k: (0.15% rdg + 3 dgt.) 20M: (1.0% + 10 dgt.) 400 to 400k: (0.5% rdg + 4 dgt.) 4M: (1% rdg + 5 dgt.) 40M: (2% rdg + 5 dgt.) 400: (1% rdg + 4 dgt.) 4k to 4M: (0.8% rdg + 4 dgt.) 40M: (2% rdg + 5 dgt.) Open Circuit Voltage 3.2VDC typ. -0.45VDC typ. (-1.2VDC on 400 range) 0.6VDC typ. (3.2VDC on 400 range) Overload Protection 400, 4k, 40k, 400k, 4M, 40M 100m, 1, 10, 100, 1k, 10k 500VDC or ACrms Diode Test Tested at 1mA, 3.2VDC max. type. (1% rdg + 10 dgt.) accuracy Tested at 1.2mA, 3.0VDC max. type. (1.5% rdg + 3 dgt.) accuracy Tested 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: 10ADC Does not apply Capacitance 4nF. 40nF, 400nF, 4F, 40F, 400F, 4mF, 40mF 4nF. 40nF, 400nF, 4F, 40F Resolution 1pF, 10pF, 100pF, 1nF, 10nF, 100nF, 1F, 10F 0.1pF, 1pF, 10pF, 100pF, 1nF Accuracy 4nF: (3% rdg + 20 dgt.) 4nF to 40F: (3% rdg + 5 dgt.) 400Fto 40mF: (5% rdg + 10 dgt.) (3% rdg + 4 dgt.) Test Voltage <1V <3.5V Ranges Overload Protection 500VDC or AC rms F re quency Ranges 2kHz, 20kHz, 200kHz 4kHz, 40kHz, 400kHz, 4MHz, 40MHz Resolution 0.1 Hz, 1Hz, 10Hz 1Hz, 10Hz, 100Hz, 10kHz, 100kHz Accuracy (0.1% rdg + 3 dgt.) Sensitivity 50mVrms min. (@>30 & <70% duty cycle: 400mVrms min.) 1Hz - 4MHz: 1Vrms 4MHz - 40MHz: >2Vrms, <5Vrms Minimum Pulse Width >25ns >25ns Duty Cycle Limits >30% & <70% Minimum Input Range 2kHz:10Hz:20kHz:>60dgt; 200kHz>60dgt Overload Protection 500VDC or AC rms 4kHz, 40kHz, 400kHz, 4MHz 1Hz, 10Hz, 100Hz, 10kHz (0.1% rdg + 3 dgt.) (0.25% + 4 Digits) (0.1% + 2 Digits) 250mVrms min. on 10Hz to 1MHz 500mVrms min. on 1MHz to 4MHz >2s >30% & <70% 500VDC or AC rms L ogic Te st Logic Threshold Hi=2.80.8V, 0=0.8 0.5V Frequency Response 20MHz Does not apply Does not apply Hi=2.80.8V, 0=0.8 0.5V 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 20MHz Tempe rature Range, Resolution Does not apply Accuracy -58 to +2372F, 1F, (-50to + 1300C, 1C) Does not apply Does not apply Does not apply Does not apply (0.8% rdg + 2C) -50 - 400C, (1% rdg + 2C) 400 - 1300C Duty Cy cl e Range, Resolution 0 to 90%, 0.1% Accuracy (5V logic) (2.0% rdg + 10 dgt.) Minimum Pulse Width 10s Frequency Range 40Hz to 20kHz Overload Protection 500VDC or AC rms Does not apply G eneral Display 20000 count, 4 1/2 digit LCD 4000 count, 3 3/4 digit LCD with 41 segment analog bar graph Polarity Automatic, positive implied, negative polarity indication Operating Temperature 32 to 122 (0 to 50C), 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). 4000 count, 3 3/4 digit LCD 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 2 v040611 w w w.bk prec ision.c om