DAQ6510 Data Logging

If you are using the DAQ6510 for logging data at a 1,000 sample per second rate, can you also use the multiplexer, or is the DAQ dedicated to the front panel for data logging?
 

You can definitely control the measurement rate while scanning, you will just have to account for scan rate.

Thanks. I am not experienced enough with use of the instrument to fully understand. I guess you are saying that I can use the multiplexer I but have to account for scan rate. What is the maximum scan rate? If you are using three channels, would all three be scanned at the same rate, and would that be 1/3 of the maximum?

And a side question, can I log digital input data or must the  input be analog? The input data would be voltage, but it might be coming from a digital source.

Is the DMM6500 the same as the DAQ6510 such an application? I have one of each.
 

The DMM6500 and DAQ6510 operate the same way, in general.
The front panels of each will operate like a standard DMM with single input to a single A/D converter.
The sample rate, determined by several settings, will govern the measurement speed on each channel (either front panel or at each channel on a switch card).
The scan rate will determine how quickly each channel will change/switch. This only governs the channel switching, not the measurement itself.
To achieve a desired 'total rate' you would need to account for the sample rate of the measurement and the scan rate of the switch card/relays.
Multiplexers operate in a sequential switching configuration, so you would follow a sequence like the one below:
CH1 close + measure > CH1 open > CH2 close + measure > CH2 open > CH3 close + measure >......
Here, you'll find the scan rate will impact the open-close portion of the operation and the sample/measure rate will impact the measurement once the channel is closed/selected.
You will need to refer to the datasheets for each of the instruments and the switch card to determine specific rate specifications:
https://www.tek.com/en/datasheet/dmm6500-6-1-2-digit-bench-system-digital-multimeter-datasheet
https://www.tek.com/en/datasheet/daq6510-data-acquisition-and-logging-multimeter-system-datasheet

The instrument uses an analog input for the signal from your DUT.
It will then be processed through an A/D converter for reporting as a reading.