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TYPE 1263-B AMPLITUDE-REGULATING POWER SUPPLY
1.3.4 MATCHED DETECTOR. In setups for measuring transmission or
frequency characteristics of various elements and networks, a Type
874-VQ Voltmeter Detector, terminated in a Type 874-WM Termination
Unit, can be used at the output of the unknown to measure the output
signal. The Type 874-VQ Voltmeter Detector is similar to the Type 874-VR
Voltmeter Rectifier (paragraph 1. 3. 2), except that it does not contain a
series 50-ohm resistor and does contain compensating elements to min-
imize
discontinuity produced by the shunt reactance of the crystal diode.
A block diagram of the set-up for plotting frequency characteristics of a
Type 874-F185 Low-Pass Filter is shown in Figure 3. In this diagram,
the output of a Type 1215-B Unit Oscillator, regulated by the Type 1263-B
Amplitude-Regulating Power Supply, is fed through the output rectifier
(874-VR) to the device under test (874-F185).
The output from the de-
vice under test is detected by the properly terminated Type 874-VQ Volt-
meter Detector and the characteristics are plotted on an x-y plotter.
1.3.5 SWEEP DRIVE. The General Radio Type 1750-A Sweep Drive can
be used with oscillators operating from the power supply to produce a
sweeping frequency source with constant rf output over the sweep range.
This sweep drive also has a blanking voltage and provides a cathode-ray-
oscilloscope deflection voltage synchronized with the position of the
driven dial.
1.3.6 DIAL DRIVE.
For permanent, precise recording of data, a two-
axis plotter is an invaluable accessory. The General Radio Types 907-R144
and 908-R96 Dial Drives are designed to sweep equipment using stand-
ard General Radio 4-inch (Type 907-R Drive) and 6-inch (Type 908-R
Drive) dials.
The Type 1263-B Amplitude-Regulating Power Supply,
used with any of the oscillators listed in paragraph 1.3.1, will provide a
TYPE
1263-B
AMPLITUDE
REGULATING
POWER SUPPLY
"y"
AXIS SIGNAL
!
DEVICE
I
UNDER
TEST
TYPE
TYPE
TYPE
TYPE
TYPE
1215-B
r-
874-VR
r-
874 -F185
-
874-VQ
1--
874-WM
XY
UNIT
VOLTMETER
LOW
PASS
VOLTMETER
5011
PLOTTER
OSCILLATOR
RECTIFIER
FILTER
DETECTOR
TERMINATION
).-
i
TYPE
"X" AXIS SIGNAL
DC
908-R96
-
SUPPLY
DIAL
DRIVE
Figure 3. Typical setup for plotting frequency characteristics.
5
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