General Radio Company 1605-A Other
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Model:
1605-A
Date:
1957
Category:
Group:
Description:
Impedance Comparator
Information
The Type 1605-A Impedance Comparator (Figure 1) is designed
to measure and indicate on meters the magnitude and
phase-angle differences between two external impedances. No
bridge-balancing operation is necessary, and these
measurements may therefore be made rapidly and easily.
The instrument is basically a special, self-contained,
bridge measurement system, consisting of a signal source, a
bridge, and a detecting circuit. The bridge proper consists
of the two external impedances to be compatfed and two
highly precise unity ratio arms. Since these ratio arms are
equal to within one partin 106, the accuracy of impedance
measurement depends, largely on the precision of the
external standard. The detector sensitivity permits
measurements to 0.01% and 0.0001 radian, an order of
magnitude more accurate than that of most precision
impedance bridges.
In general, this bridge circuit is not adjusted for a
balance, but instead the unbalance voltage is measured to
give the required impedance difference information. The
detector is phase sensitive, and selects those vector
components of the unbalance voltage that are proportional to
theimpedance- magnitude difference in percent and the
phase-angle difference.
The combination of four decade frequencies from 100 cps to
100 kc, with a very wide impedance range and several
difference ranges, results in an instrument of wide
versatility and flexibility.
1.2 PURPOSE. The combination of speed, wide range and high
accuracy in the Impedance Comparator bring precision to
rapid production testing and speed to delicate laboratory
measurements. Obvious uses are the rapid sorting, matching,
and selecting
of components. Inspection of the most precise components can
be made rapidly over wide ranges of impedance and frequency.
Components of poor phase angle (lossy capacitors or
inductors, or resistors with a reactive component), which
could cause circuit difficulties as easily as could
components of improper value, can be rejected without the
need for specialized test procedures.
The precision possible when precise impedance standards are
used results in a system that can replace many intricate
measurement setups in the laboratory and simplify the
measurement procedure.
Because the impedance-difference information is provided
continuously, the measurement of changes in impedance due to
environmental changes is greatly simplified. With a suitable
recorder, a record of the data may be easily made.
With an adjustable standard, the instrument may be brought
to a null, in which case transfer impedances of three
terminal networks may be determined. When the instrument is
nulled, impedance shunting of the detector does not affect
the K^1coj »!*ci thv sffcct of iRipvdmiCs shiiutiug jjig
ratio s»*ins is usually negligible due to the tight coupling
of these arms.
Manyother special measurements are possible, including
checking the tracking of ganged components, adjusting
balanced transformer windings, and loss measurements on
dielectric materials. The process of comparison is basic to
impedance measurement, and a precise comparator should find
many other interesting uses.
Manual type:
Service and User Manual
Pages:
52
Size:
7.03 Mbytes (7372082 Bytes)
Language:
english
Revision:
Manual ID:
933-B
Date:
1957 11 01
Quality:
Scanned document, all readable.
Upload date:
2016 12 30
MD5:
38ad60543080beabe1c98f5e9d3c46b3
Downloads:
530
Information
Section 1.
INTRODUCTION ... 1
1.1
Description ... 1
1.2
Purpose ... 1
1.3
Controls ... I
1.4
Connections ... 2
1.5 Definitions and Abbreviations.
... 2
1.6 General
Recommendations ... 4
Section 2. PRINCIPLES OF
OPERATION ... 4
2.1 General . .
... 4—
2.2
Oscillator ... 4
2.3 Bridge
Equations ... S
2.4 Bridge
Transformer ... 5
2.5 Amplifier Input and Guard
Circuit ... 6
2.6 Signal Amplifier and Relay
Circuit ... 6
2.7 Phase-Sensitive
Detectors ... 7
Section 3.
INSTALLATION ... 7
3.1 Power
Connections ... 7
3.2
Grounding ... 7
3.3
Mounting ... 7
Section 4. OPERATING
PROCEDURE ... 8
4.1
General ... 8
4.2 Connection of Standard and Unknown
Impedances ... 8
4.3 Frequency
Selection ... 8
4.4
Zeroing ... 8
4.5
Calibration ... 8
4.6 Range
Selection ... 8
4.7 Guard
Circuit ... 8
4.8
Measurement ... 8
Section 5. RANGES AND
ERRORS ... 9
5.1
General ... 9
5.2 Measurement of Low Impedance . . , .
...
9
5.3 Measurement of High
Impedance ... 9
5.4 Correction for Large AZ Deviations on the 10%
Range ...
11
5.5 Possible
Errors ...
12
5.6 Extending the Deviation
Ranges ...
12
5.7 Unbalanced Loading on
Transformer ...
13
5.8 Measurements in Terms of R. L, or C
Differences ...
14
5.9 Measurement of AD and
AQ ...
^
Section 6. SPECIAL
MEASUREMENTS ...
16
6.1 Remote
Measurements ...
16
6.2 Direct or Transfer Impedance Measurements on
Three-Terminal Networks ... 16
6.3 Measurement of Transfer Voltage
Ratios ... ——•
•—• • • ... 17—
6.4 Measurements on
Potentiometers ...
18
6.5 Measurements on Small
Capacitors ...
19
6.6 Measurements on Ganged
Capacitors ...
20
6.7 Precise Measurement of Small -Dissipation-Factor
Capacitors ... 20
6.8 Measurement on Dielectric Samples ...
. . . ... 21
6.9 Measurements on Balances Transformer Windings
... 21
6.10 Measurements with Applied D-C Voltage and
Current ...
22
6.11 Use of External
Recorders ...
23
6.12 Automatic
Sorting ...
23
Section 7. SERVICE AND
MAINTENANCE ...
24
7.1
General ...
24
7.2
Adjustments ...
24
7.3 Adjustment
Procedure ...
25
7.4 Trouble-Shooting
Procedure ...
25
7.5 Trouble-Shooting
Data ...
28
PARTS LISTS AND
SCHEMATICS ...
30-43