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Use the following procedure to measure resistance with this

mode:

1. Turn on the instrument and allow it to warm up for one

hour to obtain rated accuracy.

2. Place the instrument in the amps mode by pressing AMPS.

3. For maximum accuracy, select the 2pA range and zero COT-

rect the instrument by enabling zero check and then zero

correct in that order.

4. Select the desired range or use autoranging, if desired.

5. Connect the voltage source and INPUT jack to the

measured resistance, as shown in Figure 2-14. Use the

Model 6011 or other similar triaxial cable to make the in-

put connections.

6. Turn on the source output by pressing the OPERATE but-

ton.

7. Press the DISPLAY button to return the display to the

meter mode.

8. Disable zero check. The meter will now display the current

being sourced through the resistor under test by the

voltage sowce. To measure from a baseline current, such

as fixture leakage, enable suppress while in amps.

9. To display the resistance being measured, press SHIFT and

then OHMS in that order. The V/I light will turn on indi-

cating that the V/I ohms mode is enabled. If a displayed

resistance overload occurs, the usual “OL” display message

will be indicated; however, if the input current exceeds the

maximum input G&e for the selected amps range, the

AMPS LED will flash, as previously indicated. Note that

the display can be placed in either the alpha or numeric ex-

ponent mode as discussed in paragraph 2.5.

10. To measure from a baseline resistance enable suppress

while in V/T

V-SOURCE

LO HI

-0 0

L-- -SELDl

IOPTlONALl

MODEL 617

rgure z-14. v/I Hesistance Measurement Connections

Keithley 617 User Manual

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