PERFORMANCE TESTS
5-6
Resistance Accuracy Table
resistance range
conditions SR715 tol. + R tol. SR720 tol. + R tol.
10.0 3 1 kHz series 9.9780 - 10.022 9.9930 - 10.007
25.0 3 1 kHz series 24.945 - 25.055 24.983 - 25.018
25.0 3 10 kHz series 24.920 - 25.080 24.970 - 25.030
25.0 3 100 kHz series --------------- 24.945 - 25.055
100.0 3 1 kHz series 99.780 - 100.22 99.930 - 100.07
100.0 2 1 kHz series 99.780 - 100.22 99.930 - 100.07
400.0 2 1 kHz series 399.12 - 400.88 399.72 - 400.28
400.0 2 10 kHz series 398.72 - 401.28 399.52 - 400.48
400.0 2 100 kHz series --------------- 399.12 - 400.88
1.6000k 2 1 kHz parallel 1.5965k - 1.6035k 1.5989k - 1.6011k
1.6000k 1 1 kHz parallel 1.5965k - 1.6035k 1.5989k - 1.6011k
6.4000k 1 1 kHz parallel 6.3859k - 6.4141k 6.3955k - 6.4045k
6.4000k 1 10 kHz parallel 6.3795k - 6.4205k 6.3923k - 6.4077k
6.4000k 1 100 kHz parallel ----------------- 6.3859k - 6.4141k
25.0000k 1 1 kHz parallel 24.945k - 20.055k 24.983k - 25.018k
25.0000k 0 1 kHz parallel 24.945k - 20.055k 24.983k - 25.018k
100.0000k 0 1 kHz parallel 99.780k - 100.22k 99.930k - 100.07k
100.0000k 0 10 kHz parallel * 99.680k - 100.32k 99.880k - 100.12k
400.0000k 0 1 kHz parallel 399.12k - 400.88k 399.72k - 400.28k
* if the Q value is greater than 0.1, the allowed tolerance must be multiplied by (1+Q).
Capacitance Accuracy
1) Connect the SR728 Fixture Adapter to the SR715/720. Install a BNC to stacking banana plug adapter on
the end of each BNC cable. Tape over (or cut off) the ground leads of the plugs connected to the orange
(Vh) and purple (Vl) cables. Connect the ground leads of the red (Ih) and blue (Il) cables to the case
ground of the decade box.
Plug the orange and purple signal leads to the "+" and "-" terminals on the decade box. Plug the red signal
lead into the orange signal lead and plug the blue signal lead into the purple signal lead.
Set the SR715/720 to its default conditions ( [recall] 0 ), then press [R+Q] and 1 kHz.
2) Unplug the red/orange lead pair from the "+" terminal of the decade box and plug them into the blue/purple
lead pair. Perform short circuit cal. Remove the red/orange lead pair from blue/purple lead pair and locate
them at the same separation from the blue/purple pair as they will be during operation. Perform open
circuit cal.
3) Connect the red/orange lead pair to the "+" terminal of the decade box. Set the dials to all zeros.
4) Note the capacitance value the SR715/720 measures. This is the capacitance of the switch contacts and
connectors. Enter this as a relative value in the entry display. Set the SR715/720 to the DEV display
mode.
5) Set the decade capacitor and the SR715/720 according to the values in Capacitance Accuracy Table
below. Verify that the readings fall within the acceptable values. Record the results.
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