Harman Kardon AVR 7200 Service Manual page 128

AVR7200
MITSUMI
·Measurement Procedures (MM1501 ~ MM1504)
Consumption current
Voltage gain
Frequency characteristic
Differential gain
Differential phase
Total harmonic distortion ratio
Output dynamic range
Output offset voltage
Cross talk
SW input voltage
Connect a DC ammeter to V
I
CC
the ammeter to use.
Input a 2.0V (1.0V
P-P
wave to SG1. If TP1 voltage is V1 and TP3 voltage is V2, find Gv
G
V
using the following formula:
In the above Gv measurement, if TP3 voltage at 10MHz is V3, find
fc fc as follows:
Input a 2.0V (1.0V
P-P
DG and measure differential gain at TP3.
DP The same as for DG, but measure differential phase.
Input a 2.5V (1.25V
P-P
THD
SG1, connect a distortion factor meter to TP3 and measure.
Input a 100kHz sine wave to SG1. Change the amplitude of the sine
V wave, and measure V
D
TP3.
V Measure the DC voltage difference of each switch status at TP2.
OFF
VC1 = 2.1V and VC2 = 0.7V. Input a 2.0V
SG1, and operate SW3. If TP3 voltage when there is an output
C signal on the OUT pin is V4, and when there is no signal TP3
T
voltage is V5, then find C
Impress an optional DC voltage on TP5 and TP6. Gradually
increase from VC1 = 0V. When TP6 voltage is output on TP2, TP4
V
I
voltage is V . Gradually lower from VC1 = V
IH
voltage is output on TP2, TP4 voltage is V
128
Video Switch · 75 driver · Y/C mix MM1501
pin and measure. Hereafter, short
CC
for MM1502 and MM1504), 100kHz sine
P-P
G = 20LOG (V2/V1) dB
V
fc = 20LOG (V3/V2) dB
for MM1502 and MM1504) staircase to SG1
P-P
APL = 10 ~ 90%
for MM1502, MM1504), 1kHz sine wave to
P-P
, the maximum amplitude under THD 1%, at
D
, 4.43MHz sine wave to
P-P
by the following formula:
T
C = 20LOG (V5/V4) dB
T
CC
.
IL
harman/kardon
, and when TP5