Digital Meter / Printer
Digital Meter Relay
MODEL 4257
- ■ Easy calibration for scaling
- ■ Available analog or BCD output
- ■ Relay or open collector for comparison output
Model Designation
| 4257 | - | □ | - | □ | - | □ | - | □ | - | □ | - | □ |
| ① | ② | ③ | ④ | ⑤ | ⑥ |
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) |
