HP (Hewlett-Packard) TM 11-6625-2779-14&P ユーザーズマニュアル
Model 3555B
Section V
Table 5-8. FUNCTION Switch Resistance Values
NOTE
The following resistance measurements were made with C1 shorted. Be sure to
remove the short after completion of your measurements.
remove the short after completion of your measurements.
INPUT JACKS
DIAL/AC MON JACKS
FUNCTION
Tip to Ring
Tip to Ground
Ring to Ground
BRDG
TERM
BRDG
TERM
BRDG
TERM
DIAL BAT
NG
80.4 kilohms
80.4 kilohms
NG HOLD
80.4 kilohms
700 ohms
VF/Nm
900 BAL
900 ohms
DIAL JACKS, resistance is
900 BAL HOLD
400 ohms
infinite Tip to Ring, Tip to
Ground and Ring to
Ground and Ring to
600 BAL
600 ohms
Ground on all functions.
600 BAL HOLD
350 ohms
CARRIER
600 BAL
600 ohms
600 BAL HOLD
600 ohms
135 BAL
135 ohms
135 BAL HOLD
135 ohms
75 UNBAL, to Ground
BRDG:
100 kilohms,
-30dBm thru +30dBm ranges
120 kilohms,
40dBm Range
400 kilohms,
-50dBm thru -80dBm ranges
TERM:
75 ohms
b.
With a 6.2mV rms signal at XA3 pin 9,
measure the signal at XA1, pin 6 or at the
AC MON jacks. This signal should be
270mV rms ± l10o. If not, check A3Q6
through A3Q10 and associated
components, using the dc levels indicated
in Figure 7-5.
measure the signal at XA1, pin 6 or at the
AC MON jacks. This signal should be
270mV rms ± l10o. If not, check A3Q6
through A3Q10 and associated
components, using the dc levels indicated
in Figure 7-5.
c.
If a 270mV rms signal appears at the AC
MON jacks, check the detector circuit
(A3Q11 through A3Q17).
MON jacks, check the detector circuit
(A3Q11 through A3Q17).
5-39.
FACTORY SELECTED VALUES.
5-40.
components in the Model 3555B, along with the purpose
of each. Nominal values are shown on the schematic
diagrams in Section VII and in the parts list, Table 6-1.
of each. Nominal values are shown on the schematic
diagrams in Section VII and in the parts list, Table 6-1.
5-15