Basic Power Supply Operation 2-11
Reading back V and I
Actual V and I display mode
Measured output voltages and currents are displayed with the actual V and I display mode
selected. This display mode is selected as follows:
NOTE If output settings are presently being displayed (as denoted by a blinking digit in the
voltage or current field), keep pressing the SET key until the blinking stops. The in-
strument can now display measured readings.
1. Press the DISPLAY key to access the display menu.
2. Press the
¹ or ƒ key until “ACTUAL V AND I” is displayed.
3. Press ENTER. Voltage readings are located on the top line of the display, and current
readings are located on the bottom line.
NOTE For details on display modes, see “Display modes” in Section 1.
Measurement configuration
CURRENT RANGE, INTEGRATION RATE and the AVERAGE READINGS count can be
checked or changed from the menu (which is accessed by pressing the MENU key).
NOTE Table 1-2 (in Section 1) shows the menu structure. Rules to navigate the menu follow
the table.
Current range
Current range is linked with current limit. Therefore, as a general rule, the user selects the
current range before setting the current limit. The current range can be changed at any time, but
selecting the lower range may change the current limit setting. See “Outputting voltage and cur-
rent” (in this section) for details on current range and current limit.
Integration rate
The integration (reading) rate of the instrument is specified as a parameter based on the num-
ber of power-line cycles (NPLC), where 1 PLC for 60Hz line frequency is 16.67msec (1/60). In
general, the fastest integration time (0.01 PLC) results in increased reading noise. The slowest
integration time (10 PLC) provides the best common-mode and normal-mode rejection.
In-between settings are a compromise between speed and noise.
The INTEGRATION RATE item of the menu is also used to set the reading rate for DVM
measurements. Note that it is not used to set the integration rate for pulse current and long inte-
gration measurements. These measurements are covered in Sections 3 and 4, respectively.
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