Racal Instruments 9916 Workshop Manual page 56

5.29 Rotate
R64
fully anticlockwise. Apply a signal of 530 MHz at a lever of 7mV r.m
.5.
(-30 dBm) to the UUT and rotate
R64
clockwise until the instrument counts
. correctly.
5.30 Apply the frequencies shown in Table 9 at a level of 8mV r.m.s.
(-29
dBm) with
the RESOLUTION switch set as indicated. Verify that a stable and accurate display
is obtained at this level.
TABLE 9
'A
I
Channel Sensitivity
Frequency Resolution
Display
400
MHz
1 kHz
00400 .000
MH z
300 MHz 100 Hz
0300.0000 MHz
210 MHz
100 Hz
0210.0000 MHz
90 MHz 10Hz
090 .00000 MHz
38 MHz
10 Hz
038.00000 MHz
5.31 Press and release the RESET button. Verify that the display resets to zero.
- -5.32 Apply
38
MHz to ,the input and monitor the voltage at the AGC output pins on the
rear panel. Check that the
A
GC vo! tage becomes more positive as the input leve
I
increases from zero to 100 mV r.m.s. (-7 dBm) and remains within the range 1± 0.2 volts
- ,6
±
1
vo
Its.
5.33 Disconnect the signal from the 'A
I
Channel input and select BURST. Press and
release the RESET button and verify that the numerals of the display go out but
the decimal point remains.
5.34 Set the signal generator- to
an
output of 520 MHz at a level of ;ust greater than 20 mV
r.m.s. (-21 dBm). Connect the signal generator to\he 'A' Channel input. Check
that the display shows all zeros until the end of the gate period and then indicates the
appl ied frequency.
5.35 Press and rerease the RESET button and check that the frequency displayed at the end
of the gate period is correct. Set the
N
O~fv\A
VBURST/C'HECK switch to
NORfv\A. L
and verify that the same frequency is indicated.
5-10
1'916 Vol.2