2-3
IM 2560A-01EN
Features
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
16
App
Index
2.2 DC Voltage, DC Current, and Resistance Sourcing
Source and Sink
At the 100 mA range, the 2560A not only outputs current but can also sink current.* Sinking is possible
for positive and negative voltage output. Sinking is also possible at other ranges, but it is not defined
as part of the instrument’s specifications.
* By absorbing the current from a voltage source such as a distributor, the 2560A can simulate a load, like a
two-wire transmitter.
−122.4 mA −30 mA
122.4 mA
30 mA
Approx. −30 V
Approx. 30 V
Voltage
Current
Sink
Source
Source
Sink
The sink current range is the same as the source range
of the 100 mA range.
: Immediately after sinking current in this region, errors
exceeding the accuracy specifications may occur
due to the increased temperature inside the 2560A.
Resistance Sourcing
The 2560A sources simulation resistance R (= V/I) by outputting voltage V, which is defined as R×I,
where R is the specified resistance and I the excitation current for measuring resistance, from its low
voltage-current output terminals (OUTPUT 1). The excitation current is supplied to the 2560A low
voltage-current output terminals (OUTPUT 1) from the device to be calibrated.* For example, if the
excitation current is 1 mA and the specified resistance is 100 Ω, the 2560A outputs 0.1 V.
The source range and excitation current for the resistance are shown below.
* Resistance measuring instrument, RTD thermometer, etc.
0.1 mA 2 mA
400 Ω
1 Ω
Range
400
Ω
Source Range
1.00 Ω to 400.00 Ω
Excitation current
0.1 mA to 2 mA
Resistance
Excitation current
Source
Turning the Output On and Off
The specified voltage, current, or resistance output and current sink can be turned on and off.
• ON
The specified voltage, current, or resistance is output from each output terminal. If the main setting
display is blinking, the output cannot be turned on.
In current sink mode, sinking is performed.
• OFF
No output is produced. If you change the range or if the overload protection function is activated,
the output automatically turns off.
Output Value
The output value of the 2560A is calculated from the scale, output divider, and deviation settings
(explained later) within the DC voltage, DC current, or resistance source range explained in this
section. The relational expression is shown below.
Output value = MIN + (MAX − MIN)×(n/m) + (MAX − MIN)×(−deviation)
MAX:
Maximum value of the scale (output range) (see section 2.4)
MIN:
Minimum value of the scale (output range) (see section 2.4)
m:
Denominator of the output divider (see section 2.5)
n:
Numerator of the output divider (see section 2.5)
Deviation: See section 2.6.
