Calibration Procedures; External Modulation; Controls, Indicators And Connectors - HP 608E Operating And Service Manual

Model 608E/F
4. Set MODULATION switch to CW position.
CAUTION
Do
not connect any source of RF or de power
to the RF OUTPUT connector on the signal
generator. Todosomay permanently dam-
age the impedance-matching network in the
Attenuator Section. Particular care must
be observed when testing transceiver-type
equipment to insure that the transmitter
remains inoperative whUe the equipment is
connected to the signal generator (refer to
NOTE in paragraph 3-7).
5. Connect the equipment under test to the RF
OUTPUT connector observing that the signal
generator is terminated in the proper load
(refer to paragraph 3-8).
NOTE
If deemed necessary, conduct power output
calibration procedures for the selected fre-
quency range as listed in procedural steps
d. through h. in paragraph 3-15.
6. Tune Frequency Control until MEGACYCLES
dial cursor is aligned with frequency to be used
as indicated on dial face.
NOTE
To crystal calibrate the frequency, refer to
procedures listed in paragraph 3-13.
7. Depress and tune AMPL TRIMMER control for
maximum indication on RF OUTPUT meter.
8. Adjust RF OUTPUT control until RF OUTPUT
meter pointer is aligned with +7 dBm mark
(ATTENUATOR CALIBRATED).
NOTE
Accuracy of the Attenuator Control setting
and PERCENT MODULATION meter are
within specifications only when the RF OUT-
PUT meter is indicating ATTENUATOR
CALIBRATED.
9. Adjust Attenuator Control for desired output
level of +7 dBm or below.
NOTE
To select RF output levels from +7 dBm to
+13 dBm in the Model G08E, perform steps
10 through 12. In this operation, the RF
OUTPUT meter pointer is used to indi cate
the power output level in lieu of the Attenu-
ator Control.
10. Adjust the Attenuator Control to the +7 dBm
dial mark.
Section ill
11. Check that the RF OUTPUT meter pointer in-
dicates ATTENUATOR CALIBRATED.
12. Adjust the RF OUTPUT controliorthe desired
output level above +7 dBm as indicated by the
RF OUTPUT meter pointer.
13. Set the MODULATION switch to the AM posi-
tion.
14. Connect the external sine-wave generator to
the AM/PULSE MOD lliPUT connector and set
generator for a sine-wave input between 20 Hz
and 20
kHz.
15. Set MODULATION control for desired percent-
age of modulatlon as observed on the PER-
CENT MODULATION meter.
EXTERNAL PULSE MODULATION
NOTE
Perform turn-on procedures if required,
and complete steps 1 through 3.
16. Set MODULATION switch tothe PULSE/SET
RF OUTPUT position.
NOTE
Perform steps 5 through 12 as applicable.
17. Set the MODULATION switch to the PULSE
position.
18. Connect the external pulse generator to the
AM/PULSE MOD INPUT connector and set
generator for an input pulse level above 10
volts peak-to-peak.
EXTERNAL DC CONTROL
NOTE
Perform turn-on procedures if required,
and complete steps I through 8.
19. Set the MODULATION control to a maximum
clockwise position.
20. Set MODULATION switch to the AM position.
21. Connect external power source to AM/PULSE
MOD INPUT connector.
NOTE
Voltages required for external control of
the RF carrier are +15 volts dc for full-on
operation and -15 volts dc for full-off opera-
tion.
22. Adjust Attenuator Control and de control volt-
age input for desired RF output leveL
Figure 3-3. Controls, Indicators and Connectors Used in
Operation with Externally Supplied Signals (Cant. )
3-9