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Section
I-
Introduction
1.1 DESCRIPTION.
The 1650-B Impedance Bridge (Figure 1-1) is a
self-contained impedance-measuring system, which in-
cludes s i x bridges for the measurement of capacitance,
resistance, conductance, and inductance, a s well a s
the generators and detectors necessary for dc and
1-kHz measurements.
Features of this bridge include
one-percent C , G, R, and L accuracy over a l l ranges,
high D and Q accuracy, a mechanism t o facilitate low
Q
measurement, a slow-motion
mechanism on the
CGRL dial, visual ac and dc null indications, comb
plete portability, and a convenient
tilt in^
mechanism
-
and carrying case. The slow-motion mechanism turns
the CGRL dial slowly and effortlessly about a 1-in.
sector. Extra torque must be applied to move the dial
beyond the 1-in. sector.
In the relay-rack model (Figure 1-2), the captive
cover of the Type 1650-B is replaced with a relay-rack
adaptor panel (paragraph 1.6).
1.2 OPENING AND TILTING THE CABINET.
The directions for opening the Type 1650-B Im-
pedance Bridge are given on the handle support of the
instrument.
Once open, the instrument may be tilted
to any convenient angle, The angle should be chosen
to give the most comfortable a c c e s s to the knobs and
the best view of the meter and dials.
The instrument may be locked fully open by the
same slide pins that are used to lock the instrument
closed.
Thus, the instrument can be carried in the
open position with the cover firmly in place.
Whether the instrument is open or closed, the
cover forms a convenient storage place for the instruc-
1.3 POWER SUPPLY.
The Type 1650-B is powered by four D cells,
which slide into a fiber tube inside the instrument.
These batteries, supplied with the instrument, should
be installed with the positive terminals (center buttons)
facing the open end of the tube. The batteries are pro-
tected from leakage and accidental discharge during
shipment by an insulating diskinserted between the cap
and the last cell. Toremove the disk, proceed a s follows:
a. Open the instrument cabinet and place it in the
locked position.
b. Remove the two cabinet screws (Figure 1-4).
c . Lift the instrument from i t s cabinet.
d. Follow the directions on the battery tube, and
remove the disk.
e . Place the battery tube back in i t s holder.
f. Replace the instrument in i t s cabinet.
g. Replace the two cabinet screws.
The instrument is now ready t o operate a s soon a s it
is in the desired position and turned on.
tion manual and for any other test data that should be
kept with the instrument.
Figure
1
-
2.
Type 1650-8 Impedance Bridge
in
rack panel.
INTRODUCTION
1-1
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