Our Technology, solution for Tomorrow too!

Digital Meter / Printer

Digital Panel Meter

MODEL 451A

  • ■ Highly visible large LED Display
  • ■ Grouped commonly-used parameters
  • ■ Scaling, Average processing function, and Peak & Bottom hold function
  • ■ Water- and dust-proof IP65 front panel
  • ■ Pulse input 451A

Operation manual

Model Designation

451A - - - - -

①Measuring input

Code Measuring range Input impedance Accuracy Over load
01 ±19.999 mV 5 MΩ ±(0.05% of rdg + 5digit) DC ±50 V
V1 ±100.00 mV 5 MΩ
02 ±199.99 mV 120 kΩ ±(0.05% of rdg + 3digit)
04 ±1.9999 V 1 MΩ ±(0.1% of rdg + 1digit) DC ±250 V
±19.999 V 10 MΩ
±399.9 V 10 MΩ ±(0.1% of rdg + 3digit) DC ±750 V
06 ±699.9 V 10 MΩ
11 ±19.999 μA 10 kΩ ±(0.05% of rdg + 3digit) DC ±2 mA
12 ±199.99 μA 1 kΩ DC ±20 mA
14 ±1.9999 mA 100 Ω ±(0.1% of rdg + 1digit) DC ±50 mA
±19.999 mA 11 Ω DC ±150 mA
±199.99 mA 1 Ω DC ±500 mA
49 DC 1 to 5 V 1 MΩ DC ±250 V
DC 0 to 5 V 1 MΩ
DC 4 to 20 mA 12.4 Ω DC ±150 mA

②Power supply voltage

Code Power source voltage
A AC 100 to 240 V
B DC 12 to 24 V
C DC 110 V

③Power source for sensor

Code Output voltage Output current
Blank -
2T DC 5 V ±10% 100 mA
3T DC 12 V ±5% 150 mA *1
5T DC 24 V ±5% 100 mA *2

④Analog output, RS-485

Code Data Output Output impedance Tolerable Load resistor
Blank -
09 Analog output DC 0 to 10 V
(Available scaling, Default: 1 to 5 V)
Less than 0.1 Ω More than 500 Ω (DC 1 to 5 V)
More than 1 kΩ (DC 0 to 10 V)
29 Analog output DC 0 to 20 mA
(Available scaling, Default: 4 to 20 mA)
More than 5 MΩ 0 to 600 Ω (DC 4 to 20 mA)
BP BCD output (TTL level positive logic) -
BN BCD output (TTL level negative logic) -
DP BCD output (transistor output, source type) -
DN BCD output (transistor output, sink type) -
E0 RS-232C -
E1 RS-485 -
EC Decimal point external control -

⑤Data output 2 (Available- 09 and -29 of ④ Data output 1 only)

Code Data output
Blank No output
E0 RS-232C
E1 RS-485
EC Decimal point external control

Basic Specifications

Display 0 to 99999, red or green LED (character height 15.2 mm), “-” polarity, with zero-suppress function.
Scaling offset -99999 to +99999
Scaling full scale -99999 to +99999
Display cycle Selectable from 67ms, 400ms, 1s, 2s, 4s, 5s
Resolution 1/100000
Sampling rate Approx. 15 times / s.
Response within 2 samplings or 1 display cycle, whichever longer
Input method Single ended, floating input
A/D conversion ⊿-∑conversion method
Noise Rejection Normal mode (NMR) - More than 50 dB.
Common mode (CMR) - More than 110 dB.
Noise through power supply line - 1000 V (at AC voltage power supply)
Insulation Resistance DC 500 V, More than 100 MΩ
Withstand Voltage Input terminals - External case: AC 1500 V each for 1min.
Power supply terminals - External case: AC 1500 V each for 1min.
Power supply terminals - Input and output terminals: AC 500 V each for 1min.
Input terminals - Output terminals: AC 500 V each for 1min.
Power Supply AC 100 to 240 V (90 to 250 V) 50/60 Hz, DC 12 to 24 V (9 to 32 V)
Power Consumption 451A itself: Approx. 7 VA at 100 V AC, 9 VA at 200 V AC, 300 mA at 12 V. 150 mA at 24 V DC.
Power supply unit: Approx. 7VA at 100V AC, 9VA at 200V AC, 200mA at 12V. 100mA at 24V DC.
Operating Temperature 0 to 50°C
Storage Temperature -20 to 70°C
Weight Approx. 220 g (60 g of the power supply unit)
Housing protection IP65 for the front panel, IP20 for the rear case, IP00 for terminals

page top