Toyo Keiki
Toyo Keiki CF Series DC Ammeter Moving-coil Type
Product Made In Japan
Manufacturer: Toyo Keiki
Model: CF Series
Remarks
Instrument Lead Instrument lead is not included
Instrument Lead Resistance :
1. Meters externally attached to shunts are normally adjusted to an instrument lead resistance of 0.05Ω for the specified meter. (Indicate LEAD 0.05Ω on the scale plate)
Note) Use wiring that is equivalent to 0.05Ω for the wiring of the instrument lead.
2. Please specify separate instructions if the instrument lead resistance of the specified meter is to be a value other than 0.05Ω. (Instrument Lead Resistance: Can be manufactured up to 1.5Ω…However, use a meter with both a voltage drop and shunt of 100mV for 1Ω or more.)
3. If the instrument lead resistance is not clearly specified, the meter can be manufactured with a sensitivity adjustment variable resistor (VR).
Note1) The model name of a meter equipped with VR is the same as the normal model name with V appended. E.g. DCF-12NV
2) DCF-5 meters equipped with VR cannot be manufactured.
Connection to Shunt
1. Connect the shunt to the wires on the earth side.
Note
Zero center meters and multiple-scale meters can also be manufactured.
50mV and 100mV meters with externally attached shunts can also be manufactured.
Note Table of Instrument Lead Resistance
| WireDiameter | 1m | 2m | 3m | 4m | 5m | 10m | 20m | Conductor Resistance Q/km |
|---|---|---|---|---|---|---|---|---|
| 0.75 mm2 | 0.05 | 0.1 | 0.15 | 0.2 | 0.25 | 0.5 | 1.0 | 24.4 |
| 1.25 mm2 | 0.03 | 0.06 | 0.09 | 0.12 | 0.15 | 0.3 | 0.6 | 14.7 |
| 2.0 mm2 | 0.02 | 0.04 | 0.06 | 0.08 | 0.1 | 0.2 | 0.4 | 9.50 |
| 3.5 mm2 | 0.01 | 0.02 | 0.03 | 0.04 | 0.05 | 0.1 | 0.2 | 5.09 |
| 5.5 mm2 | 0.0066 | 0.0132 | 0.0198 | 0.0264 | 0.033 | 0.066 | 0.132 | 3.27 |
Note) 1. The resistance values indicated in the table above are applicable when the prescribed length of vinyl wire for wiring electric devices is installed as return wiring.
2. If the wiring exceeds 20m, calculate from the conductor resistance value column.
Specification
| Measurement Range Value | DCF-5 | DCF-6 | DCF-8 | DCF-10 | DCF-12N | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | |
| 50 pA 100 pA 200 pA 500 pA 1 mA 2 mA 5 mA 10 mA 20 mA 50 mA 100 mA 500 mA 1 A 5 A 10 A 15 A 20 A 30 A 50 A ~ 15 kA | – | – | 12500 (taut band) 8300 (taut band) 835 Q 600 Q 65 Q 25 Q 5 Q 5 Q 3 Q | Not Required | 12500 (taut band) 8300 (taut band) 835 Q 600 Q 65 Q 25 Q 5 Q 5 Q 3 Q | Not Required | 23500 (taut band) 10100 (taut band) 900 Q 900 Q 200 Q 50 Q 6 Q 5 Q 4 Q | Not Required | 23500 (taut band) 10100 (taut band) 900 Q 900 Q 200 Q 50 Q 6 Q 5 Q 4 Q | Not Required |
| 1000 Q 500 Q 100 Q 32 Q 5 Q 5 Q 3 Q | Not Required | |||||||||
| Voltage Drop :60mV Sensitivity : Approx. 6mA | Built-in | Voltage Drop :60mV Sensitivity : Approx. 6mA | Built-in | Voltage Drop :60mV Sensitivity : Approx. 6mA | Built-in | Voltage Drop :60mV Sensitivity : Approx. 5mA | Built-in | Voltage Drop :60mV Sensitivity : Approx. 5mA | Built-in | |
| External | Back-mounted Note 2 | Back-mounted Note 2 | Back-mounted Note 2 | Back-mounted Note 2 | ||||||
| External | External | External | External | |||||||
| Weight | Approx. 0.06kg | Approx. 0.09kg | Approx. 0.1kg | Approx. 0.12kg | Approx. 0.15kg | |||||
| Reception Meter Meter Input | DCF-5 | DCF-6 | DCF-8 | DCF-10 | DCF-12N | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | Internal Resistance | Shunt | |
| 4~20mA | 3Q | Not Required | 3Q | Not Required | 3Q | Not Required | 3Q | Not Required | 3Q | Not Required |
| Weight | Approx. 0.06kg | Approx. 0.09kg | Approx. 0.1kg | Approx. 0.12kg | Approx. 0.15kg | |||||
Note 1. Intrinsic error of the internal resistance value is ±30% (at 23°C).
Note 2. Terminal cap is not included. (Optional) Specify if required
Outside Dimensions
DCF-5
DCF-6
DCF-8
DCF-10
DCF-12N
Note 1) Resistor for sensitivity adjustment is included with DCF-6V, DCF-8V, DCF-10V and DCF-12N models only.
Note 2) DCF-6, DCF-8, DCF-10, DCF-12N models 15 – 30A meters have a back-mounted shunt as shown in the figure on the left. (however, a terminal cap is not included.)
Connection Diagram
