Maintenance; Factory Repair; Inspection And Performance Verification; Required Test Equipment - Wavetek 145 Instruction Manual

NOTE
The completion of the calibration procedure
returns the instrument to correct alignment.
CALIBRATION LIMITS AND
TOLERANCES ARE NOT
INSTRUMENT SPECIFICATIONS
Instrument specifications are given in Sec-
tion 1 of this manual.
5.1 FACTORY REPAIR
Wavetek maintains a factory repair department for those
customers not possessing the necessary personnel or test
equipment to maintain the instrument. If an instrument is
returned to the factory for calibration or repair, a detailed
description of the specific problem should be attached to
minimize turnaround time.
5.2 INSPECTION AND PERFORMANCE
VERIFICATION
Inspect and verify instrument performance every six months
or at a frequency determined from actual instrument usage.
Inspect the exterior for damage, cleanness and loose knobs.
Use a soft cloth dampenea with commercial window cleaner
to clean the exterior. When calibrating or repairing the
instrument, inspect the instrument interior for heat damage
and loose wires. This instrument requires no lubrication.
Verify performance by performing the calibration pro-
cedures.
5.3 REQUIRED TEST EQUIPMENT
Refer to table 1-1 for equipment required to perform the
calibration procedures.
5.4 REMOVING GENERATOR COVERS
WARNING
With covers removed, several dangerous
voltage points may be exposed. Contact with
these points could cause serious
injury or
death.
1. Invert the instrument; remove the four screws in
the cover.
2. Turn the instrument upright; remove the top
cover; and remove the four screws securing the
bottom cover.
3. Replace the top cover.
NOTE
Remove the covers only when it is
necessary to make adjustments or meas-
urements.
5.5 CALIBRATION
After referring to the following preliminary data, perform
calibration, as necessary, per table 5-1. If performing partial
SECTION
5
MAINTENANCE
calibration, check previous settings and adjustments for
applicability. See figures 5-1 and 5-2 for calibration point
location.
1. Unless otherwise noted, all measurements made at the
son OUT connector should be terminated into a 50n
(±0.1 %) load.
2. Allow the unit to warm up at least 30 minutes for
final calibration. Keep the instrument covers on to
maintain heat. Remove covers only to make adjust-
ments or mP.;:isurernents.
3. Verify operation in TRIG and GATE modes by con-
necting an external generator to the TRIG IN BNC
and observing proper operation of TRIGGER LEVEL
and TRIGGER START /STOP controls(par~graph 3.1 ).
4. Verify SYNC OUT is an approximate 30 ns positive
pulse into son and that GCV OUT is a voltage pro-
portional to dial position with"a 2V max (open circuit).
5. Properly terminate the TTL, TTL, ECL and ECL out-
puts (paragraph 3.2.1) and verify proper operation
(paragraph 3.
1)
6. After starting the calibration by connecting the .
unit to an ac source and setting the front panel
switches as follows; invert the instrument.
Dial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 02
FREQ MULT . . . . . . . . . . . . . . . . . . . . . . . . . . 100K
FREQ VERNIER ...................... Full cw
GENERATOR MODE .................... CONT
TRIGGER LEVEL .................... Full ccw
TRIGGER START/STOP ................. 0° CAL
PULSE DELAY ................... 50 ns 1100 ns
PULSE DELAY VARIABLE ................. cw
Pulse Mode . . . . . . . . . . . . . . . . . . . . . . . . . DOUBLE
PULSE WIDTH . . . . . . . . . . . . . . . . . . . . . . . . . OFF
PULSE WIDTH VARIABLE ............. 12 o'clock
DC OFFSET . . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DC
ATTENUATION ....................... 20
I
0
ATTENUATION VERNIER .............. Full ccw
POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ON
5-1