HP 4262A User Manual

Page 8-53, Figure 8-39,
Correct the flow diagram as shown below:
PROCEDURE: 1
START ————»
Set 4262A controls as follows:
FUNCTION. ... .......... C
CIRCUIT MODE. ... ... PRL
LCR RANGE . ....... AUTO
TRIGGER. ............ INT
Unknown ....... Open(0pF)
Observe waveforms at A14TP5
and TP4. Do they have precisely
the same phase as each other for
all test frequencies (120, 1k and
10kHz)? See photo below.
A14TP4
Al4TP5
NO
() Q19 Gate
Q22 Gate
Monitor signals at A14Q19 and
Q22 Gates. Do they look like
this?
5V/div
YES
Monitor signal at A14Q6 Collector.
@ Is the waveform as illustrated?
Does the signal frequency
satisfy the table below?
Is signal at A14TP4 a
squarewave?
NO
I
YES
~
/
\
/ Is signal at A14U9 pin 3
.5Vp-p pulse? 1
-
NO
!
Check A14Q8.
\
~
~— —
YE§'
,
Is potential difference be-
tween A14Q7 Base and
Emitter 0.6Vdc?
NC
Check A14Q7.
YES
Check A14U9.
Check
Result
A14Q24
Can a pulsed waveform be observed
at A14U8 pin 11?
Is dc level at A14Q21 (Q24)
Emitter 3V?
éll‘?Q?
Is
amplitude
of
the
pulse
NO
Does
4Vp-p
square
pulse
NO
ollector
at
A14Q6
Collector
15Vp-p?
appear
at
A14U13
pin6?
[~
TEST
SIGNAL
Frequency
/,—YES\\
-
YES\
120Hz
120Hz
(8.3ms)
,
4
~
N
i
~
N
1kHz
1kHz
(1ms)
"
=
Monitor
signal
at
A14Q6
10kHz
1kHz
(1ms)
Base.
Is
tfi'e’
pulse
with.h
1
!
R‘l’jsu‘gvl‘?'i’
E,“‘s"
appear
at
{NO
YES
A
10us?
\
pin
§?
]
\
A
\
[YES
NO/
\
YES
/
N
~
7/
N
7/
J
~
e
-
+
~
-
_
-
e
Go
to
PROCEDURE
2
NO
Check
A14U13.
Check
A14US.
g;‘fgk
Al4Q6
and

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English