RF Band Selector
Hewlett-Packard MX292B Wave-guide to coaxial adapter.
Centered (5 turns from
FINE RF CENTER FREQ
Hewlett-Packard MP 292B Wave-guide to coaxial adapter.
Hewlett-Packard NK292A Wave-guide to coaxial adapter.
Hewlett-Packard 11503A flexible wave-guide.
Phase Lock Controls
Hewlett-Packard 11504A flexible wave-guide,
INT REF FREQ
PERFORMANCE CHECK PROCEDURE
1. Trace Alignment
a. Requirement--Horizontal trace alignment is not criti-
In the following procedure, test equipment connections or
cal and is usually set to the operator's requirement, If mis-
control settings should not be changed except as noted. If
alignment is excessive (approximately 2) refer to the Cali-
only a partial check is desired, refer to the preceding step(s)
for setup information.
The following procedure uses the equipment listed under
Recommended Equipment. If substitute equipment is used,
control settings or setup must be altered to the require-
a. Requirement--Well defined display with equally fo-
ments of the equipment used.
cused vertical and horizontal segments in the display.
Several checks use a 200 MHz signal applied to the RF
b. Adjust the GAIN control for a display with approxi-
INPUT connector. This IF feedthrough signal is not tunable
mately 1 division of noise.
c. Adjust the FOCUS control for optimum focus, then
other signals it is recommended that the tunable signals be
adjust the ASTIGMATISM control for optimum vertical def-
positioned off the screen with the RF CENTER FREQUENCY
inition. Display should be well defined with optimum setting
of the FOCUS control.
3. Scale Illumination
Connect the instrument to a power source within the reg-
ulating range of the Type 491. Turn the POWER switch to
ON and allow at least 20 minutes warm up time at 25 C
fully counterclockwise to maximum illumination with the con-
5 C before checking the instrument to given accuracy.
trol fully clockwise.
Set the front panel controls as follows:
b. Rotate the SCALE ILLUM control from a fully counter-
clockwise position to full clockwise.
Adjusted for a sharply
c. Illumination must increase smoothly as the control is
Position the trace to the
bottom graticule line and
4. Position Controls
a. Requirement--Vertical P O S I T I O N c o n t r o l m u s t p o s i -
tion the sweep beyond the upper and lower graticule limits,
Horizontal POSITION control must position either end of the
sweep into the graticule area.
b. Rotate the Vertical POSITION control to both extremes.
Note that the range of the control equals or exceeds the
requirements in step a.
c. Rotate the Horizontal POSITION control to both ex-
tremes. Note that the range of the control equals or exceeds
the above requirements.
All switches OFF
IF ATTENUATOR dB
IF CENTER FREQ Controls
5. Check Sweep Length
IF CENTER FREQ
a. Requirement--Sweep Length must equal 10.5 divisions
b. Check the above requirements for the sweep length.