Instructions
Table Of Contents
- Model DMM6500 6½-Digit Multimeter User's Manual
- 1 Introduction
- 2 Front-panel overview
- 3 Using a remote interface
- 4 Making basic front-panel measurements
- 5 Measuring DC voltage with high accuracy
- 6 Measuring 4-wire resistance with offset compensation
- 7 Scanning temperature at a set time interval
- 8 Grading and binning resistors
- 9 Measuring power using digitizing and TSP-Link
- 10 Troubleshooting FAQs
- About this section
- Where can I find updated drivers?
- Is there any software to help me get started?
- Why did my settings change?
- Why can't the DMM6500 read my USB flash drive?
- How do I upgrade the firmware?
- How do I change the command set?
- How do I save the present state of the instrument?
- How do I save what is displayed on the screen?
- What is the ethernet port number?
- 11 Next steps
- Contact information
Model DMM6500
6½ Digit Multimeter User's Manual Section 5:
Measuring DC voltage with high accuracy
DMM6500-900-01 Rev. B / August 2019 5-3
There is no internal connection between protective earth (safety ground) and the LO
terminals of the DMM6500. Therefore, hazardous voltages (more than 30 V
RMS
) can appear on
LO terminals. This can occur when the instrument is operating in any mode. To prevent
hazardous voltage from appearing on the LO terminals, connect the LO terminal to protective
earth (safety ground) if your application allows it. You can connect the LO terminal to the
chassis ground terminal on the front panel or the chassis ground screw terminal on the rear
panel. Note that the front-panel terminals are isolated from the rear-panel terminals.
Therefore, if you are using the front-panel terminals, ground to the front-panel LO terminal. If
you are using the rear-panel terminals, ground to the rear-panel LO terminal. Failure to follow
these guidelines can result in injury, death, or instrument damage.
Measuring DCV with high accuracy
This application demonstrates how to use the DMM6500 to make high-accuracy DC voltage
measurements. You can make the measurements from the front-panel interface or over the remote
interface using SCPI code or TSP code. For information about setting up remote communications,
see Remote communications interfaces (on page 3-1
).
For this application, you will:
• Restart the instrument.
• Verify that the DC voltage function is selected.
• Set the range to 10 V.
• Set the integration rate to 1 power line cycle (PLC) at 60 Hz line frequency; 1 PLC provides an
aperture of 16.67 ms.
• Turn on autozero. This allows the instrument to optimize the accuracy of readings by checking
reference measurements.
• Enable a repeating filter with a count of 100. This reduces noise error because the results are
more stable when the measurements are averaged.
• Generate readings from the front panel or the remote interface.