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Digital Meter / Printer

Digital Meter Relay

MODEL 4257

  • ■ Easy calibration for scaling
  • ■ Available analog or BCD output
  • ■ Relay or open collector for comparison output

Operation manual

Model Designation

4257 - - - - - -

① Measuring input

DC Input
Code Measuring range Input impedance Accuracy Over load
01 ±9.999 mV 100 MΩ ±(0.1% of rdg + 2digit) DC ±50 V
02 ±99.99 mV ±(0.05% of rdg + 1digit) DC ±250 V
03 ±999.9 mV
04 ±9.999 V 10 MΩ
05 ±99.99 V DC ±500 V
06 ±699.9 V ±(0.1% of rdg + 2digit) DC ±750 V
09 1 to 5 V 1 MΩ ±(0.05% of rdg + 2digit) DC ±250 V
V2 0 to 5 V
11 ±9.999 μA 10 kΩ ±(0.1% of rdg + 1digit) DC ±2 mA
12 ±99.99 μA 1 kΩ DC ±20 mA
13 ±999.9 μA 100 Ω DC ±50 mA
14 ±9.999 mA 10 Ω DC ±150 mA
15 ±99.99 mA 1 Ω DC ±500 mA
16 ±999.9 mA 0.1 Ω ±(0.2% of rdg + 2digit) DC ±2 A
19 4 to 20 mA 12.5 Ω ±(0.1% of rdg + 2digit) DC ±150 mA
AC Input
Code Measuring range Input impedance Accuracy Over load
22 99.99 mV 10 MΩ ±(0.2% of rdg + 5digit) AC 10 V
23 999.9 mV AC 100 V
24 9.999 V AC 700 V
25 99.99 V
26 699.9 V ±(0.3% of rdg + 5digit)
32 99.99 μA 1 kΩ AC 20 mA
33 999.9 μA 100 Ω AC 50 mA
34 9.999 mA 10 Ω AC 150 mA
35 99.99 mA 1 Ω AC 500 mA
36 999.9 mA 0.1 Ω ±(0.5% of rdg + 10digit) AC 2 A
37 5 A 0.01 Ω AC 10 A

②Power supply voltage

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

③Data output 1

Code Output specifications Output impedance Tolerable Load resistive
Blank -
03 Analog output DC ±1 V Less than 0.1 Ω More than 200 Ω
04 Analog output DC ±5 V More than 1 kΩ
05 Analog output DC ±10 V More than 2 kΩ
09 Analog output DC 1 to 5 V More than 1 kΩ
23 Analog output DC ±1 mA More than 5 MΩ 0 to 10 kΩ
24 Analog output DC ±5 mA Less than 5 MΩ 0 to 2 kΩ
29 Analog output DC 4 to 20 mA Less than 5 MΩ 0 to 600 Ω
BP BCD output (TTL level positive logic) -
BN BCD output (TTL level negative logic) -
DN BCD output (transistor output, sink type) -

④Alarm output

Code Specification
Blank Relay contact output
TN Open collector output (NPN)

⑤Comparison System

Code Description
Blank HI,GO,LO *
H HI,GO,
L GO,LO *

*Can be changed to HH,H,GO and GO,L,LL

⑥Display color

Code Color
Blank Red LED
G Green LED

Basic Specifications

Display 0 - 9999, red or green LED (character height 15 mm), “-” polarity, with zero-suppress function.
During the measuring mode, the display switches from current value to peak memory, bottom memory,
display amplitude, and current value.
"PM" illuminates at peak memory display, "BM" illuminates at bottom memory display, both "PM" and "BM" illuminates at display amplitude display.
Decimal point indication Arbitrary position by setting from the front panel and the rear terminals
Over-range display Flashes at 130%, but blinks "0000" when exceeding "9999".
Flashes at full scale value when exceeding "699" for model 4257-06
Flashes at full scale value when exceeding 9V for model 4257-26.
Scaling function Full-scale display: -9999 to +9999 (0 to +9999 for the AC input type)
Offset display: -9999 to +9999 (0 to +9999 for the AC input type)
Resolution 1/10000
Sampling rate 15 times / s
Display cycle with selectable function from 67ms, 400ms, 1s, 2s, 4s, 5s
Input response within 2 samplings or within 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)
Comparative digit Figure: 4-digit, Pole: 1-digit
Comparative method 2-isolated contact, programmable of high/low point (for model HI, GO, and LO)
CPU comparative judgement method (against display value)
Setting method by Digital switch setting
Width of hysteresis 1-999, set the same value for 2-comparative output
Comparative display LED display, HI(red), GO(green), and LO(yellow)
Comparative output Relay contact, 1-SPST Normally Open, 125 V 0.5 A AC, 250 V 0.1 A AC (resistive)
Optionally available AC250V 1A resistive, except of BCD and/or Analog output model
NPN Open collector, Max. DC 30V 30mA, Max. 1.6V saturation voltage
Delay output ON delay, 0 to 60 seconds, arbitrary setting by 1 second step from the front switch (set the same value for 2-comparative output)
Hold Hold for the measuring data, comparative output, and data output
Reset Default the comparative output
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.
Power Supply AC 100 to 240V (50/60Hz), DC12 to 24V
Power Consumption Approx. 5VA at100V AC, 7VA at 200VAC, 180mA at 12V. 90mA at 24VDC.
Operating Temperature 0 to 50°C
Storage Temperature -20 to 70°C
Weight 450 g (both AC and DC power supply)

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