Kenwood VT-183, Service Manual, Page: 8 / 20

300mV range VR102
(Unless otherwise specified, the above connection should be used as to the follow-
ing items.)
RANGE: 300 mV
1) Input 1 kHz (or 400 Hz), 300 mVrms sine wave, and set the pointer to 3.0 of the
0-3 scale. Check that the variable range is less than 98% and more than 102%
with respect to 3.0 (full-scale).
2) Waveforms shown on the oscilloscope shall not be deformed.
To obtain the best performance, periodically calibrate the
unit. Sometimes, only one mode need to be calibrated, while
at other times, all modes should be calibrated. When one
mode is calibrated, it must be noted that the other modes
may be affected. When calibrating all modes, perform the
calibration in the specified sequence.
The following calibration requires an accurate measuring
instrument and an insulated adjusting flat blade screwdriver.
If they are not available, contact your dealer. For optimum
adjustment, turn the power on and warm up the scope suffi-
ciently (more than 30 minutes) before starting.
Before calibrating the unit, check the power supply voltage.
TEST EQUIPMENT REQUIRED
The following instrument or their equivalent should be used
for making adjustment.
PREPARATION FOR ADJUSTMENT
Control Settings
The control settings listed below must be used for each
adjustment procedure.
Exceptions to these settings will be noted as they occur.
After completing adjustment, return the controls to the fol-
lowing settings.
Test Equipment
Digital Multimeter
Frequency Counter
Oscilloscope
Calibrator
CR Oscillator
Attenuator
Q-Meter
Distortion Meter
Insulation Meter
50
Ω
Termination
Model
DL-712
FC-756
CS-6010
5100B
AG-203
RA-920
4343B
885
SM-5
TA-57
Maker
KENWOOD
KENWOOD
KENWOOD
FLUKE
KENWOOD
KENWOOD
YHP
Shibasoku
TOA
KENWOOD
NAME OF KNOBS
RANGE
RELATIVE REF
POSITION
AUTO
CAL
ITEM PROCEDURE ADJUSTMENT POINT
Oscilloscope
50
Ω
oscillator
Main unit
CAL
OUT IN
Oscillator Calibrator
OK NG NG
OUT OUT
Oscillator or calibrator
VT-183
8
ADJUSTMENT
VT-183(K) internet 98.6.8 9:38 AM y [ W 15