Model 7700 Multiplexer Module Instructions for use with DAQ6510
077144300 / April 2018 23
Verifying ratio and average
Follow the procedure below to verify ratio and average.
Do not exceed 300 VDC between plug-in module INPUT H and L terminals or between any
adjacent channels. Failure to observe this precaution can cause instrument damage.
To verify ratio and average:
1. Connect the CH1 H and L INPUT terminals to the DC voltage calibrator as shown in the next figure.
Use shielded, low-thermal connections when testing the 100 mV and 1 V ranges to avoid errors
caused by noise or thermal effects. Connect the shield to the output LO terminal of the calibrator.
Figure 12: Connections for verification
2. Install the module in Slot 1 of the DAQ6510.
3. Turn on the power.
4. Allow the instrument to warm up for one hour.
5. Make sure that the front-panel TERMINALS switch is set to REAR.
6. On the front panel of the instrument, select FUNCTION and then select DCV Ratio.
7. On the Home screen, swipe to the CHANNEL swipe screen.
8. Close channel 101.
9. Set the range to 1 V.
10. Set the calibrator output to 1.00000 VDC.
11. Allow the reading to settle.
12. Verify that the ratio reading is between 0.9999926 and 1.000074.
13. Return to the CHANNEL swipe screen, and open Channel 1.
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