Technical data

30 U1401A User’s and Service Guide

2 Calibrator Output Operations

Constant Current Operation

The U1401A can generate a constant current output in the

range of ±25 mA.

To select the constant voltage output function:

1 Turn the rotary switch to any one of the (constant

current output) positions.

2 Press SHIFT to access the shifted operations of the keypad.

The annunciator will appear on the display.

3 Press MODE to cycle through ±25 mA, ±25 mA, and

±25 mA output modes. Select the ±25 mA output

mode for constant output (or steady output, as opposed to

autoscan or autoramp outputs, which will be discussed

under “Memory Generation” on page 31).

• Unlike the autoscan and autoramp modes, there is no

special annunciator on the display to indicate constant

current (CC) operation.

4 With the instrument in standby mode (you should see the

annunciator on the display; if not, press OUTPUT), you

can adjust the amplitude of the output by pressing

and to select the digit to be adjusted, and then

pressing and to adjust the value of the selected

digit.

5 Press OUTPUT to start the source output. The

annunciator will appear on the display.