IET Labs, Inc. RLC Digibridge 1693, User And Service Manual, Page: 53 / 171

29
1693 RLC Digibridge
Operation
3.2.13 Connection to 1404 Reference
Standard Capacitor
Note:
These same instructions also apply to 1403,
1408, and 1422.
Connection to the 1404 Reference Standard Capacitor
can be accomplished using the 1689-9602 BNC to
BNC cables, two BNC-T connectors and two GR 874
adapters, if applicable. Open and Short compensa-
tion should be performed. The connections shown
are applicable for 1403, 1408 and 1422 Standard
Capacitors as well.
Measurement of capacitor standards is similar to
measurements of inductors using a direct compari-
son method. The unknown is simply compared to a
standard capacitor of almost equal value that has a
NIST calibration and the measured difference is used
to obtain the value of the unknown. This technique
is straight forward when dealing with three or four
terminal standards as cable geometry and stray ca-
pacitance issues are negligible.
Figure 3-24: Connecting 1693 to a 1404
1693 RLC DigiBridge
TM
1000.0 .0002
POWER
uF
I
L
P
H
P
L
I
H
mH pF nF H k S DEG
NOT 1kHz
RANGE HELD
CONST V.
PPM
START
NO GO
GO
BIAS
ON
EXTERNAL
BIAS
REMOTE
CONTROL
On
Off
SER
On
Off
CONST I.
RATIO
mS uS
R C L Y Z G R D Q ANG B X
R/Q C/R C/D L/Q
PAR
HIGH
formerly made by GenRad
1000 pF
LOW
Type 1404-A
REFERENCE STANDARD
CAPACITOR
PH IH
PL
IL
IL
P
L
PH
IH