7-1. INTRODUCTION
This section contains information necessary to adjust the
8020 series, the pulse generator circuit (model 8021) and the
amplitude modulation circuit (model 8022).
WARNING
The procedures described in this section are
for use only by qualified service personnel.
Do not perform these procedures unless quali-
fied to do so. Many of the steps covered in this
section may expose the individual to poten-
tially lethal voltages that could result in per-
sonal injury or death if normal safety precau-
tions are not observed.
7-2. ADJUSTMENTS
7-2-1. Environmental Conditions
Adjustments should be performed under laboratory condi-
tions having an ambient temperature of 24 +/-5 degC and a
relative humidity of less than 70 %. If the instrument has been
subjected to conditions outside these ranges, allow at least
one additional hour for the instrument to stabilize before be-
ginning the adjustment procedure.
7-2-2. Warm-Up Period
Most equipment is subject to at least a small amount of drift
when it is first turned on. To ensure long-term calibration
accuracy, turn on the power to the Model 8020 and allow it to
warm-up for at least 20 minutes before beginning the adjust-
ment procedure.
7-2-3. Recommended Test Equipment
Recommended test equipment for calibration is listed in Ta-
ble 5-3. Test instruments other than those listed may be used
only if their specifications equal or exceed the required char-
acteristics.
7-2-4. Adjustment Procedures
All adjustments are performed with the POWER switch ON.
The top cover should be removed to allow access to test points
and adjustments. Between adjustments, always leave top
cover on the unit to keep internal temperature.
WARNING
Take special care to prevent contact with live
circuits or power line area which could cause
electrical shock resulting in serious injury or
death. Use an isolated tool when making ad-
justments. Use plastic or nylon screw-driver
when adjusting the time base trimmer as other
material will cause confusion in this adjust-
ment.
Refer to the component layout in Section 9 when neces-
sary for determining adjustment points. Follow the proce-
dure in the sequence indicated because some of the adjust-
ments are interrelated and dependent on the proceeding
steps.
Verify that Model 8020 is functioning according to the
performance checks. Make sure that all results are within, or
close to, the range of the required specifications, otherwise
refer to the troubleshooting procedures given later in this sec-
tion.
Center all trimmers and if necessary, remove selected
components and clear the holes to allow a selection of new
components.
Perform the following adjustment procedure. If an ad-
justment can not be made to obtain a specific result, refer to
the troubleshooting procedures.
NOTE
If not otherwise specified, set Model 8020
controls as follows and terminate the OUT-
PUT with a 50 ohms feedthrough termination.
SECTION 7
ADJUSTMENTS
Model 8020 Adjustments
Page 7-1
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