BK Precision 391A, 390A, 389A, & 388B Specifications B&K Precision B+K Precision on Sale at Test Equipment Depot

Specifications	391A	390A	389A	388B
Current	True RMS reading
Ranges	200mA, 2mA, 20mA, 20A*	400mA, 4mA, 40mA, 20A*		400mA, 4mA, 40mA, 400mA, 2A, 20A*
Resolution	10nA, 100nA, 1mA, 10mA, 1mA	0.1mA, 1mA, 10mA, 100mA, 10mA		100nA, 1mA, 10mA, 100mA, 1mA
DC Accuracy	200mA to 200mA: ± (0.5% rdg + 5dgt.) 20a: ± (2% rdg + 10dgt.)	400mA - 400mA: ± (1.5% rdg + 1dgt.) 2A: ± (2% rdg + 4dgt.)20A: ± (3.5% rdg + 4dgt.)	± (1% rdg + 1dgt.) ±(2% rdg + 3dgt.)	400mA - 400mA: ± (1% rdg + 1dgt.) 2A: ± (1.5% rdg + 1dgt.)20A: ± (3% rdg + 3dgt.)
AC Accuracy	200mA to 200mA: ± (1.2% rdg + 10dgt.) 20a: ± (2.5% rdg + 20dgt.)	400mA to 400mA: ± (1.5% rdg + 4dgt.) 20A: ± (2.5% rdg + 4dgt.)		400mA - 400mA: ± (1.5% rag + 1dgt.) 2A: ± (2% rdg + 4dgt.)20A: ± (3.5% rdg + 4dgt.)
Input Protection	mA/mA input: 0.5A/500V fast blow ceramic fuse 20A input: 20A/600A fast blow ceramic fuse	mA/mA input: 0.5A/500V fast blow ceramic fuse 20A input: 20A/600A fast blow ceramic fuse		mA/mA input: 2A/600V fast blow ceramic fuse 20A input: 20A/600A 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	200W; 2kW, 20kW, 200kW; 2MW, 20MW	400W; 4kW, 40kW, 400kW; 4MW, 40MW
Resolution	10mW, 100mW, 1W, 10W; 100W, 1kW	100mW, 1W, 10W; 100W, 1kW, 10kW
Accuracy	200W, 2MW: ± (0.25% rdg + 10dgt.) 2kW to 200kW: ± (0.15% rdg + 3dgt.) 20MW: ± (1.0% rdg + 10dgt.)	400W, 400kW: ± (0.5% rdg + 4dgt.) 4MW: ± (1% rdg + 5dgt.) 40MW: ± (2% rdg + 5dgt.)		400W, 2MW: ± (1% rdg + 4dgt.) 4kW to 4MW: ± (0.8% rdg + 4dgt.) 40MW: ± (2% rdg + 5dgt.)
Open Circuit Voltage	3.2VDC typ.	-0.45VDC typ. (-1.2VDC on 400W range)		0.6VDC typ. (3.2VDC on 400W range)
Overload Protection	500VDC or ACrms	500VDC or ACrms
Diode Test	Tested at 1mA, 3.2 VDC max. typ. ± (1.0% rdg + 10dgt.)	Tested at 1.2mA, 3.0 VDC max. typ. ± (1.5% rdg + 3dgt.)		Tested at 1mA, 3.2 VDC max. typ. ± (1.5% rdg + 3dgt.)
Transistor Test (hFE)	Does not apply	Does not apply		hFE range: 0 - 1000 hFE base current: 10mADC
Capacitance
Ranges	Does not apply	4nF, 40nF, 400nF, 4mF, 40mF, 400mF, 4mF, 40mF		4nF, 40nF, 400nF, 4mF, 40mF
Resolution		1pF, 10pF, 100pF, 1nF, 10nF, 100nF, 1mF, 10mF		0.1pF, 1pF, 10pF, 100pF, 1nF
Accuracy		4nF: ± (3% rdg + 20dgt.) 4nF to 40mF: ± (3% rdg + 5dgt.) 400mF to 40mF: ± (5% rdg + 10dgt.)		± (3% rdg + 4dgt.)
Test Voltage		< 1 V		< 3.5 V
Overload Protection		500VDC or AC rms
Frequency
Ranges	2kHz, 20kHz, 200kHz	4kHz, 40kHz, 400kHz, 4MHz, 40Mhz		4kHz, 40kHz, 400kHz, 4MHz
Resolution	0.1Hz, 1Hz, 10Hz	1Hz, 10Hz, 100Hz, 10kHz, 100kHz		1Hz, 10Hz, 100Hz, 10kHz
Accuracy	± (0.1% rdg + 3dgt.)	± (0.1% rdg + 3dgt.)	± (0.25% rdg + 4dgt.)	± (0.1% rdg + 2dgt.)
Sensitivity	50mVrms min. (@>30 & <70% duty cycle: 400mVrms min.)	1 Hz - 4MHz: 1Vrms 4MHz - 40MHz: >2Vrms, <5Vrms
Minimum Pulse Width	> 25ns	> 25ns		> 2ms
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	40 m sec beep at logic I (Hi)			40 m sec beep at logic I (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 + 10dgt.)
Minimum Pulse Width	10ms
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 (H x W x D)	7.8 x 3.5 x 1.57" (198 x 90 x 40mm)
Weight	11.3 oz. (320 g)

BK Precision 391A, 390A, 389A, & 388B Specification Comparison Chart

BK Precision 391A, 390A, 389A, & 388B
Specification Comparison Chart