Specifications

Mechanical Indicators
44
Table of maximum allowable values of lead wires for DC ammeters combined with shunts
Model name
YM-206NDA, YM-208NDA
YM-210NDA
YM-8NDA, YM-10NDA
YM-12NDA
LM-80NDA
LM-110NDA
DC ammeter combined with shunt
Maximum one-way length (m) in the
case of a 2mm
2
lead wire (Mitsubishi
Electric standard lead wire)
Indicator rating (mV)
60 or more less than 75
75 or more less than 100
100 or more less than 150
150 or more
60 or more less than 75
75 or more less than 100
100 or more less than 150
150 or more
60 or more less than 75
75 or more less than 100
100 or more less than 150
150 or more
Maximum allowable resistance value of lead wire (Ω)
0.72
1.55
2.37
4.02
0.40
0.90
1.40
2.40
1.00
1.50
2.40
4.00
39
84
128
217
21
48
70
135
54
80
135
217
69
149
227
384
38
86
134
230
96
144
230
384
Maximum one-way length (m) in the
case of a 3.5mm
2
lead wire
Table of round-trip resistance values according to lead wire thicknesses and one-way lengths
Lead wires for shunt connection
1.25mm
2
2mm
2
3.5mm
2
5.5mm
2
Round-trip resistance value (Ω) (length: one-way)
1m
0.033
0.018
0.010
0.007
2m
0.066
0.037
0.021
0.013
3m
0.099
0.055
0.031
0.020
4m
0.132
0.074
0.042
0.027
5m
0.165
0.092
0.052
0.033
10m
0.330
0.184
0.104
0.066
20m
0.660
0.368
0.208
0.132
Lead wire resistance
(Ω/km)
16.5
9.2
5.2
3.3
One-way length
Cross-sectional area
DC ammeter combined with shunt
For DC ammeters combined with a shunt, the measured value changes according to the resistance value of the lead wire. Thus,
please refer to the following tables and specify the thickness and one-way length or round-trip resistance value of the lead wire
connecting the indicator and the shunt.
The lead wire resistance value must be within the “maximum allowable value.”
Lead wires for connecting an indicator with a shunt can be manufactured according to specifications as accessories to the indicator.
two 2mm
2
- 2m (one-way) 1500V heat-resistant vinyl wires (blue) for electric equipment.
DC ammeter with lead wire adjustment resistor
If a DC ammeter combined with a shunt is to be arranged in advance with
the lead wire length being indeterminate, use a DC ammeter with a lead
wire adjustment resistor, which can be adjusted according to the lead wire
resistance after installation of the indicator.
Adjustment range of lead wire resistance
The lead wire resistance adjustment range is the same as the maximum
allowable resistance value of lead wire in the “Table of maximum
allowable values of lead wires.”
Adjustment method
Adjustment by voltage application
Disconnect the lead wires connected to the voltage terminals of the
shunt, and adjust with the lead wire adjustment resistor so that the
indicator deflects fully when a voltage corresponding to the indicator
rating is applied to the respective ends of the lead wires.
Load
Lead wire adjustment resistor
Shunt
Lead wire
DC ammeter with lead wire adjustment resistor
Remarks
(1) In the case of a bidirectional deflection indicator, the indicator rating is the sum of the absolute values of the respective ratings.
(2) If a lead wire length exceeding the values in the above table is required, use a lead wire with a large cross-sectional area or use a shunt with a high rated
voltage.
The standard is:
Remarks
(1) Only wires with a cross-sectional area of 2mm
2
are provided; other types of wires are to be prepared by the customer.