Wavetek 3000 Instruction Manual page 68

PERFORMANCE TESTS
METHOD
EQUIPMENT
Spectrum Analyzer
Wideband Amplifier
50 ohm Load
Loop Probe
Attenuator Pads
(100 dB)
PROCEDURE
A 50 ohm receiver consisting of a 26 dB amplifier and a spec-
trum analyzer are calibrated at a 1 pV level using the Sig-
nal Generator . A loop probe is then connected to the receiver
and the leakage is measured at a one-inch distance from the
external surfaces of
the Signal Generator with the RF out-
put terminated in 50 ohms .
A screen room
may be required
for this measurement .
HP8544L/8552B/141T
HP3447D
HP11593A
See Figure 4-9
Weinschel 50-10, 50-20, 50-30, 50-40
1 .
Set the Signal Generator controls as follows :
FREQUENCY selector
500 .000 MHz
MODULATION MODE
CW
MODULATION FREQ
(Inactive)
MODULATION FM/AM
(Inactive)
OUTPUT VERNIER
Set to +3 dBm on OUTPUT meter
OUTPUT step attenuator
-110 dBm
Figure 4-9 . Loop Probe
1 . Rexolite Rod : 1 .25 in . dia . by
11 in .
2 . Hole : 1 .00 in dia . by 0 .80 in .
deep .
3 . Groove :
0 .120 in. wide by 0 .125
in deep 1 .00 in from end of rod .
4 .
Coaxial Cable :
(RG-174/U) 0 .110"
diameter by
19" long . Strip
shield
for 7 in, and cut off
shield to 1 in length .
Strip in-
sulation
from center
conductor
in .
Wind 2 turns of insulated
center conductor in groove
of
rod .
Solder shield to center con-
ductor,
and insulate the solder
joint .
5 . Wind
mylar tape around the two-
turn loop, and
around the rod
(three places) .
6 .
BNC male connector .