Constant-Resistance Mode; Constant-Voltage Mode - TEXIO LW Series Instruction Manual

2-3 Constant-Resistance Mode

Item
Input vol. range
Setting range
Resistances shown
on right correspond
to STEP values of 3
to 30000.
Theoretical resolution
Setting accuracy
Ripple noise
Temperature
coefficient
・ The resistances shown above are calculated using the following expression:Resistance =
1/(theoretical resolution × STEP)
・The constant-resistance circuit of the LW series has an internal reference power source for each
preset. Thus, when the same resistance is set for all presets, the control resistance may differ
with the presets.
・The constant-resistance circuit of the LW series switches three circuits to execute resistance
control according to the set steps. Thus, the set resistance may change greatly in the setting
accuracy range when the circuit is switched (at two points between the set steps 300 and 301
and steps 3000 and 3001).

2-4 Constant-Voltage Mode

Item
Setting range
Min. operating
current
Theoretical resolution
Setting accuracy
CV temperature
coefficient
・The constant-voltage circuit of the LW series has an internal reference power source for each
preset. Thus, when the same voltage is set for all presets, the control voltage may differ with
the presets.
Model
All models Rear: 0 to 150 V, front: 0 to 150 V
LW75-151Q H current range: 1 k to 0.1 Ω
LW75-151D L current range: 6 k to 0.6 Ω
H current range: 500 to 0.05 Ω
LW151-151D
L current range: 3 k to 0.3 Ω
H current range: 250 to 0.025 Ω
LW301-151S
L current range: 1.5 k to 0.15 Ω
LW75-151Q H current range: 333
LW75-151D
L current range: 55.5
H current range: 666
LW151-151D
L current range: 111
H current range: 1.33
LW301-151S
L current range: 222 μS (= 1/4.5 k Ω)
±(2% Vin/Rset + 1.5% FS current)
All models Vin = 1.5 or more, at 23 ±5℃, set current: 10% FS current or
more
H current range: 5 mA
LW75-151Q (Actual value measured in 5 to 1MHz range)
LW75-151D L current range: 3 mA
(Actual value measured in 5 to 1MHz range)
H current range: 10 mA
(Actual value measured in 5 to 1MHz range)
LW151-151D
L current range: 6 mA
(Actual value measured in 5 to 1MHz range)
H current range: 20 mA
(Actual value measured in 5 to 1MHz range)
LW301-151S
L current range: 10 mA
(Actual value measured in 5 to 1MHz range)
1000ppm/℃: time of rated electric power and time of rated
All models
Model
All models 0.00 to 157.50 V (0 to 105% FS)
All models 1% FS current
All models 10 mV
±(0.5% SET + 0.3% FS) at 23 ±5℃
All models
Application voltage -- Front: 1.5 V or more, rear: 1 V or more
All models 150 ppm/℃: time of rated voltage
．
μS (= 1/3 k Ω)
．
μS (= 1/18 k Ω)
．
μS (= 1/1.5 k Ω)
．
μS (= 1/9 k Ω)
．
mS (= 1/750 Ω)
current
4