Verifying Ratio And Average; Model 7751, 7752, And 7753 Verification - Keithley SourceMeter 2790 Reference Manual

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Verifying ratio and average

Follow the procedure below to verify ratio and average.

Figure 16-15

Connections for Model 7702 ratio and average verification

Use these procedures to verify source and measurement accuracy of the Model 7751,

7752, and 7753 modules.

Exceeding 300V between Model 7702 INPUT or SENSE H and L

terminals may cause instrument damage.

Connect the Model 7702 CH1 and CH21 H and L terminals to the DC calibrator, as

Install the Model 7702 in Slot 1 of the Model 2790, then turn on the power and allow

the unit to warm up for two hours before proceeding. Be sure the front panel INPUTS

switch is set to the REAR position.

Select the Model 2790 DCV function and the 1V range. Close Channel 1 by pressing

the CLOSE key and keying in 101.

Select the Model 2790 RATIO function (press SHIFT then RATIO).

Set the calibrator output to 1.00000V DC and allow the reading to settle.

Verify that the ratio reading is between 0.9999926 and 1.000074.

Press OPEN to open Channel 1.

Make sure the interlock is enabled. A Model 7753 must be installed in slot 1.

Model 2790 SourceMeter

NOTE Use shielded cables

Switch System Reference Manual

DC Voltage Calibrator

to minimize noise.