Section 4: Measurement optimization
Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
4-6
077114601 / March 2019
For example, when autozero is enabled, making 100 readings in the concurrent function with 1 NPLC
takes a total measurement time of (50 Hz power line frequency):
Total time = 5 * reading number * NPLC * (1/50) = 5 * 100 * 1 * (1/50) = 10 s
When autozero is disabled, making 100 readings in the concurrent function with 1 NPLC takes a total
measurement time of (50 Hz power line frequency):
Total time = 2 * reading number * NPLC * (1/50) = 2 * 100 * 1 * (1/50) = 4 s
Setting autozero
You can enable or disable automatic referencing. The reference setting is stored with the measure
function.
To set autozero using the front panel:
1. Press the
MENU
key.
2. Under Measure, select
Settings
.
3. Next to
Auto Zero
, select
On
or
Off
.
4. Select
HOME
to return to the operating display.
To set autozero on or off using SCPI commands:
:SYSTem:AZERo[:STATe] ON
:SYSTem:AZERo[:STATe] OFF
If autozero is enabled, all functions make internal reference measurements. If disabled, no functions
make internal reference measurements.
When you perform a fast low-current measurement, you can disable the autozero for better
measurement speed. However, if you perform a high-current measurement, enable autozero to
reduce the effect of temperature on the readings.
Displayed digits
When using the power supply function, you can set the number of digits that are displayed for
measurement readings on the front panel. You can display 4.5, 5.5, or 6.5 digits. The default is 6.5.
In the battery test and battery simulation function, you cannot set the displayed digits. The highest
digits are used.
