Martel Electronics 235 - Manual (Page 56)

To simulate ohms:
The Model 230/235 calibrator can simulate Ohms directly. This may be
useful if the RTD does not conform to a standard curve or if the actual
resistance in Ohms is needed.
To select the Ohms output function, press the RTD/Ω key while the
calibrator is in the output mode. (On the 230 press the Ω key).
The 235 display will prompt:
Select the Ohms function using the INC/DEC keys and press ENT.
The Model 230/235 calibrator will prompt for the desired output in
Ohms.
Enter the desired value within the 0 to 1000 Ohm range and press ENT.
If an incorrect or out of range value is entered, the calibrator will
display an error message and prompt again for a value.
Once a valid resistance is entered, the calibrator will set the output to
the desired resistance. The display read-out will reflect the actual
resistance being simulated at the terminals as the calibrator adjusts it
output to compensate for error and drift. When the display indicates
the selected resistance, the output is properly set to simulate the
requested resistance.
The Ohms simulation requires that the unit under test supply a nominal
.1 to 2 milliamp test current. Pulsed excitation must meet specs as
listed on page 87. If the calibrator detects that the current is absent or
out of range, OPEN or OVRANGE, as appropriate, will be displayed. The
Output Functions
230/235 51
Resistance Function
RTD OHMS
OHMS
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