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K. Confirm that the GO indicator is lit.
L. Press the START button.
M. Wait for the GO indicator to be lit. The
RLC display should be .00000 ohms .
N. Press the (MEASURE MODE] key to
select CONT.
4. Connect the three-terminal 1-µF capacitance
standard (GR 1409-Y) as follows.
This standard should be certified to an accuracy of
±.03% including the effects of aging .
RED
IH : capacitor H binding post with
end of blocking
RED & WHITE
PH: stacked on the red banana
plug
BLACK
IL: capacitor L binding post
BLACK & WHITE
PL: stacked on the black banana
plug
BLACK & GREEN
G: capacitor G, NOT linked to L
5. Verify that the RLC display agrees with the
certified value of the standard (corrected for
temperature if appropriate) within ±.0005 µF
which is the sum of .03% for the standard and
0.02% for the Digibridge.
6. Calculate the difference D1, as shown above,
and retain it for future use D1 = (displayed
measurement) - (value of standard) µF
7. Remove the 1-µF standard and connect the
4-terminal ratio-type capacitance standard
(GR 1417) and the blocking capacitor
(500 µF) as shown above. Be sure that the dc
blocking capacitor is fully discharged before
connecting it. Notice that only the left-hand
terminals of the standard are used.
8. Set the dials on the capacitance standard thus:
• CAPACITANCE: 1 µF
• TEST FREQUENCY: 1 kHz
NOTE: For detailed information on connecting to the
GR 1417 4-Terminal Capacitance Standard, see section
3.2.14.
Service and Maintenance
Table 5-7: Capacitance accuracy checks (Range 4)
9. Read the RLC display, which should be close
to the nominal value of the standard: 1 µF.
10. Calculate the difference D2, as follows, and
D2 = (1.0000 µF) - (displayed measurement) µF
retain it for future use:
NOTE: The DQ display should show D = .0085 to .0115.
K=D1 +D2 (µF)
11. Calculate the calibration factor K as follows.
Example: Suppose that in step 5, the display is 1.0013,
and the value of the standard is 1.0006. Then D1 =+
.0001 µf. In step 9, the nominal is 1.0000. Suppose
that the display is 1.0024; then D2 = -.0024 µF. The
correction K would therefore be + .0007 -.0024 =
-.0017 (µF).
12. Reset the capacitance-standard dial to
CAPACITANCE 10 µF.
13. Read the RLC display and correct it by
adding 10k. (For example, if the display is
10.023 µF and if K = -.0017, the corrected
measurement is 10.006 µF.) Verify that the
corrected measurement is within the accept-
able extremes for the 10-µF setting in Table
5-7.
14. Reset the capacitance-standard dial to
CAPACITANCE = 100 µF. Read the RLC
display and correct it by adding 1k. As in step
13, verify that the corrected measurement
is within the acceptable extremes shown in
Table 5-7.
For more information on connecting to a 1417
Capacitance Standard see section 3.2.14.
1693 RLC Digibridge
133
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