Section 5: Measuring DC voltage with high accuracy
Model DMM7510 7½ Digit Multimeter User's Manual
5-4
DMM7510-900-01 Rev. B / May 2015
If measurements are not updating, press the
TRIGGER
key for a few seconds. Verify that the trigger
mode is set to
Continuous Measurement
.
The measurement is displayed in the top area of the Home screen.
With a repeating filter count of 100 and NPLC of 10, the measurement cycle time is slow but
accurate. By reducing the values of these settings, you can get faster but less accurate readings. The
balance between speed and accuracy depends on the needs of your specific application.
Using SCPI commands
This sequence of SCPI commands sets up and runs a single high-accuracy DC voltage measurement
when a device under test is connected to the Model DMM7510 and controlled remotely.
You may need to make changes so that this code will run in your programming environment.
Send the following commands for this example application:
Command
Description
*RST
:SENS:FUNC "VOLT:DC"
:SENS:VOLT:RANG 10
:SENS:VOLT:INP AUTO
:SENS:VOLT:NPLC 10
:SENS:VOLT:AZER ON
:SENS:VOLT:AVER:TCON REP
:SENS:VOLT:AVER:COUN 100
:SENS:VOLT:AVER ON
:READ?
•
Reset the Model DMM7510
•
Set the instrument to measure DC Voltage
•
Set the measure range to 10 V
•
Set the input impedance to auto so the instrument
selects 10 G
Ω
for the 10 V range
•
Set the integration rate (NPLCs) to 10
•
Enable autozero
•
Set the averaging filter type to repeating
•
Set the filter count to 100
•
Enable the filter
•
Read the voltage value; it is a few seconds before
the reading is returned
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