Wavetek 180 - Calibration; Factory Repair; Required Test Equipment; Removing Generator Cover

5 SECTION
CALIBRATION
I
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 REQUIRED TEST EQUIPMENT
Voltmeter
Distortion Analyzer
Oscilloscope
50n (±0.1%) Load
Counter (6 digit)
5.3 REMOVING GENERATOR COVER
Remove the four screws in the lower cover, place the
instrument on its feet and lift off the top cover.
5.4 CALIBRATION
After referring to the following preliminary data, perform
calibration, as necessary, per table 5-1. If performing partial
calibration, check previous settings and adjustments for
applicability.
1. Unless otherwise noted, all measurements made at the
50n OUT connector should be terminated Into a
50n «1%, 1W) load.
2. Before connecting the unit to an ac source, check the
ac line circuit to make sure the 115/230 volt switch
is set at the correct position (see paragraph 2.2).
3. Start the calibration by setting the front panel switches
as follows:
Dial 2.0
FREQMULT X IK
SWEEPWIDTH OFF
SWEEP RATE ccw
DC OFFSET OFF
Function \
AMPLITUDE cw
4. Allow the unit to warm up at least 30 minutes for
final calibration.
Table 5-1. Calibration Chart
Step
Check
Tester
Gal
Points
Control
Setting Adjust
Desired
Results
Remarks
1
Power
supply
regulation
Voltmeter TP2 (TPl
ground)
R9
+15±0.01V
2
TP3
-15±0.05V
3
Distortion
Distortion analyzer
(50fi terminated)
5on
OUT HI
R78
R103
Minimum
distortion
5-1