IEC 30 Series - Page 32

SECTION 4
Table 4-2. Calibration and Performance Checks (Continued)
Step Calibration
Control Setting
Test
Equipment
(Mode) Procedure
*
3. Adjust R99 and Rl02
alternately for mini-
mum distortion.
4. Repeat Procedures 2
and 3 above. as neces-
sary. to retain total hfbI-
monic distortion <0.3 o.
Observe sine peaks @ 1 v/
CM.
Adjust R98 for the
most rounded appearance
(zero slope) which provides
distortion less than O. 3%.
4.8
Sine Zero Slope
FREQ Mult @ 10K
Dial @ 3.0
Scope-AC
Distortion
Analyzer
*
4.9 Sine Amplitude
Adjust
FREQ Mult @ lK
Dial @ 3.0
DVM-AC
1.
Remove distortion anal-
yzer and connect DVM
to output BNC.
2.
Adjust R81 for reading
of 7.07 ±. 012 vac (20.0
±. 036v p-p).
Readj ust R96 for 0.0 ±5mv
dc if required.
*
4.10 Sine Zero
DVM-DC
4.11
*
Sine Flatness
FREQ Mult @ 1M
RF Voltmeter
Scope
1. Remove the DVM and
connect the RF volt-
meter to the output BNC
monitor with scope.
2. Rotate FREQ dial be-
tween. 3 and 3. O.
Adjust C43 for ±O. 2 db
over the range.
Connect DVM (unterminated)
to output BNC coax. Output
shall read 0.0 ±. 01 vdc.
1.
Rotate the OFFSET pot
to the CW stop. DVM
shall read 10.0 ±.5v.
5.0
*
5. 1
OFFSET
Zero
FREQ Mult @ lK
WAVEFORM @ DC
OFFSET@ IN
AMPLITUDE @ 10v
p-p
LEVEL @ CW stop
DVM-DC
*
5.2
Variable OFFSET pulled On
~
-.....
4-6