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PDF NJU9214 Data sheet ( Hoja de datos )
| Número de pieza | NJU9214 | |
| Descripción | 4.3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJU9214 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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NJU9214
PRELIMINARY
4•3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI
!GENERAL DESCRIPTION
The NJU9214 is a 4•3/4 digits single chip digital multimeter LSI with
42 segments bargraph display.
The NJU9214 realizes high precision of ±40,000 counts measure-
ment by the NJRC original dual-slope A to D converter and realizes
also quick response bargragh display and auto-ranging by another high
speed dual-slope A to D converter.
The input attenuator part is simplified because the resistor for resis-
tance measurement is applied for voltage bleeder resistor.
Furthermore, the NJU9214 realizes root-mean-square measurement
for AC voltage and current by connecting a External RMS-DC Con-
verter, and Data output by the on chip RS-232C interface circuit.
The NJU9214 is suitable for high precision and high performance
multimeter.
PACKAGE OUTLINE
NJU9214FG1
!FEATURES
• 4•3/4 Digit Display (Available for UP to ±39,999 Display)
• 42 Segments Quick Response Bargraph Display
• NJRC Original Dual-Slope A to D Converter (±40,000Counts)
• High Speed Dual-Slope A to D Converter (±400Counts)
• Quick Response Auto-Ranging (20times/sec)
• Frequency/Capacitance/Tachometer/Adapter Measurement
• Root-Mean-Square Measurement by connecting a External RMS-DC Converter
• External Relay Driving
• Data Memory/Data Hold/Relative Display/MAX, MIN Display
• Power-on Initializing
• Auto Power-off
• Buttery Life Detector
• Rotary/Push SW Mode Selection
• 1/4 Duty LCD Display Driver
• Piezo Buzzer Direct Driving
• RS-232C Interface
• External Reference Input required
• Low Operating Current
• C-MOS Technology
• Package Outline TQFP100
1 page  
NJU9214
!FUNCTION DESCRIPTION
( 1 )Measurement function
Each measurement functions shown below is available with the NJU9214.
MEASUREMENT
FUNCTION
RANGE
Auto/Manual
DC/AC Voltage
400mV to 4000V
Auto:4-range/Manual:5-range
*1
DC/AC Current
4mA to 4000mA
Auto·Manual-2range/Manual-4range *2
DC/AC Current
40A
Fixed
Resistance (Ω)
Frequency (f)
Capacitance (C)
Tacho (rpm)
400Ω to 40MΩ
100Hz to 1000kHz
4nF to 400µF
6000rpm to 600Krpm
Auto:6-range/Manual:6-range
Auto:5-range
Auto:6-range/Manual:6-range
Auto:3-range
Diode( )
Fixed
Continuity( )
Fixed
ADP
Fixed
*3
*1 400mV range (AC/DC) is selected in only manual range.
*2 4mA-4000mA range has Auto/Manual-2range and Manual-4range mode, each mode
needs its own application circuit.
*3 ADP is applied for ºC, hfe and other measurement.
( 1 - 1 ) Voltage (DCV, ACV) measurements
The divided voltages which are output from each resistance R1 to R5 shown in following table are supplied to A/
D converter.
In the AC measurement, after the dividing voltage, these output voltages are converted to DC Voltages with the
external RMS/DC converter. This DC voltage is supplied into A/D converter.
10MΩ resistor for input terminal may be easy to be affected by noises.
Therefore 10MΩ and peripheral circuits require some protection like shields and so on for stable display.
The resistors for attenuating should be selected with a flat temperature characteristic. Especially, the resistors
(10MΩ, 10kΩ, 1kΩ) for 400V, 4000V ranges should be selected carefully. For example, when 4,000V is input,
0.4mA (4,000V÷10MΩ) flow through 10MΩ, and the resistor consumes power of 1.6W (4,000V×0.4mA) and the
temperature of the reference resistor.
After measuring at 400V, 4,000V ranges, sometimes the uncorrect value is shown on the display at 4V, 40V
ranges because the value of resister as the attenuator is changed by the temperature.
RANGE
R1(400mV)
R2(4V)
R3(40V)
R4(400V)
R5(4000V)
DIVISION RATE
1
1MΩ/10MΩ
100kΩ /10MΩ
10KΩ /10MΩ
1kΩ/10MΩ
5 Page 
NJU9214
Range setting ( Push type switch : KMS = " L ", RMS = " X " )
The range setting shown in below table is available with the " RANGE " switch.
When the switch is pressed once, the range is changed from auto to manual, and it’s range is held.
Then, the range is changed in everytime by the switch operation. When the switch is pressed over
than 1 second, the range always returns to Auto-range is possible from any range statuses.
Measurement Mode
1push(>1sec)
Auto
1push(<1sec)
Manual
Range up
1push(<1sec)
Ranging Control
Default
Range
DCV
DCV
D C mA
D C mA
Resistance ( Ω )
Continuity ( )
R1 to R5
R1 to R5
R2 to R3
R2 to R3
R1 to R6
→ HOLD
(R5→R1)
(R5→R1)
Ri→ Ri+1 (R3 →R2)
(R3→R2)
(R6→R1)
400mV to 4000V
400mV to 4000V
40mA to 400mA
40mA to 400mA
400Ω to 40MΩ
4V
4V
40mA
40mA
400Ω
400Ω
Diode ( )
4V
ADP
F IX E D
400mV
DCA
40A
ACA
40A
Frequency ( f )
Tacho ( r p m )
R1 to R5
R1 to R3
Auto-range
100Hz to 999.9kHz
6000rpm to
600krpm
100Hz
6000rpm
Capacitance ( C )
R1 to R6 → HOLD Ri→Ri+1 (R6→R1)
4nF to 400uF
4nF
( NOTE ) Frequency measurement and Tacho are always set to the auto-range.
Ranges of continuity test ( ), diode check ( ), ADP, DCA and ACA measurements are
always fixed to their default ranges.
Just after power-on operation or changing mode, their ranges are set to the default range.
In the ADP measurement, 3 units are displayed by setting of RC1 to RC3 terminals.
The R1 to R6 of above range control table are set a range corresponding to below table.
RANGE
R1
R2
R3
R4
R5
R6
DCV
400mV
*4V
40V
400V
4000V
-
ACV
400mA
*4V
40V
400V
4000V
-
DCmA
-
*40mA
400mA
-
-
-
ACmA
-
*40mA
400mA
-
-
-
Ω
*400Ω
4kΩ
40kΩ
400kΩ
4000kΩ
40MΩ
f
*100Hz
1000Hz
10kHz
100kHz
1000kHz
-
rpm
*6000
60000
600k
-
-
-
C
*4nF
40nF
400nF
4uF
40uF
400uF
( NOTE ) The " * " mark means the default range.
Changing to DC400mV range or AC400mV range is available by only manual operation. Auto-range
operation cannot change to these ranges.
When the auto-range is switched in DC400mV or AC400mV range, measurement is continued in the
400mV range. When overflow occurs in 400mV of the auto-range, its range changes to 4V range auto-
matically.
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet NJU9214.PDF ] | |
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