IET Labs Inc. 1616 Test Set
Capacitance-Measurement system is designed for the
precise measurement of capacitors and capacitance standards.
In the standards laboratory, its high resolution for
capacitance and conductance make this system well suited for
capacitance standards measurements. Its phase-indicating
error meters facilitate rapid balancing. Convenient in-line
readout maximizes accuracy of manual data recording and BCD
outputs are provided for automatic data processing.
system measures either 3-terminal or 2-terminal
capacitors. The transformer-ratio-arm circuitry of the
bridge assures that 3-terminal measurements can be made
accurately, even in the presence of large capacitances to
ground. For instance, a ground capacitance of 1 ;uF produces
an error of only 0.03% in the measurement of 1000-pF
capacitor. This feature makes the assembly very useful for
in situ measurements of ungrounded circuit capacitances.
Precision Capacitance Bridge, one of the 3
instruments in that system, may be obtained separately. The
bridge will perform as described herein, if used with an
and detector equivalent to the CiR 1316 and 1238.
This manual describes the 1621
system generally and provides
its operating instructions. This manual also describes in
detail the 1616
A wide range of capacitances can be measured, extending from
the resolution limit of 0.1 aF (10‘7pF) to a maximum of 10
/if, with internal standards, or farther with external
standards. For 3-terminal unknown capacitors, a
pair of coaxial terminals is provided; for 2-terminal
coaxial "unknowns," a single precision connector facilitates
exacting control of fringing effects.
Since an important use of this bridge is the comparison of
capacitance standards, another pair of coaxial terminals is
provided on the bridge to which a 3-terminal reference
standard can be connected and designated EXTERNAL STANDARD.
The other standard is then connected to the selected UNKNOWN
terminals, and the internal standards are used to complete
the balance. If the ratio between the two standards is close
to 0.1, 1., or 10, the accuracy of the measurement is equal
to the accuracy of calibration of the reference standard,
and the precision of comparison is 1 part in 10s (0.01 ppm)
of a 10-pF capacitor (or even better for larger ones).
1.2 DESCRIPTION. Figure 1-1.
Precision Capacitance-Measurement System consists
of the 1616
Precision Capacitance Bridge with the 1316
and the 1238 Detector, a complete system for the
precise measurement of capacitance.
and detector are mounted above the bridge, in a
pedestal cabinet, as pictured in the front pages (and Figure
1-2); or the three instruments may be rack mounted.
Connecting cables, supplied, go neatly behind the assembly.