EasyManuals Logo

Fluke 43B Service Manual

Fluke 43B
164 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #122 background imageLoading...
Page #122 background image
Corrective Maintenance
7.5 Miscellaneous Functions
7
7-13
the table below.
If not correct, the protection circuit or the current source in the T-ASIC (N301) may
be defective.
If the current is correct, and the Volt function is correct (so ADC is correct), then the
Ohms part in the C-ASIC is defective: replace N101.
Range 50
1)
500 5 k 50 k 500 k 5 M 30 M
Current 500 µA 500 µA 50 µA5 µA0.5 µA 50 nA 50 nA
1)
The 50 range is only available in the Continuity measurement function.
The current in the Diode measurement function must be 500 µA.
2. Press
and select OHMS/CONTINUITY/CAPACITANCE.
Press
(Capacitance).
Verify TP156 for +3.3 ... 0V pulses (repetition rate 100...200 ms):
Zero scale (open input): pulse width approximately 30 µs.
Full scale (for example 500 nF): pulse width approximately 25 ms.
If not correct, most probably the C-ASIC N101 is defective.
If correct continue at 7.5.8 Trigger functions (pulse width is measured via the
T-ASIC).
7.5.8 Trigger Functions
1. Select the Scope Normal mode for both input channels:
Press
, highlight SCOPE and press , press (SETUP), highlight INPUT
2 Coupling: XXX, press
, highlight
DC, press , highlight Time Base:
XXX, press
, highlight
NORMAL, press , press BACK.
2. Supply a 1 kHz sine wave of +/- 3 divisions to Input 1, and Input 2.
3. Check:
a. TP156, TP256 for a 600 mV (6 div. x 100 mV/div), 1 kHz, sine wave; the DC
level depends on the trace position. The sine wave is interrupted now and then
to do a reference measurement.
If not correct, C-ASIC N101/N102 is probably defective.
b. TP321, TP322 for 1.1...1.9V DC (move the trigger level from top to bottom).
If not correct check the PWM circuit, see 7.5.8.
c. TP311for a 0...+3.3V, 1 kHz square wave when the trigger level is at the middle
of the trace). Change the trigger level, and verify that the duty cycle of the
square wave changes. If not correct T-ASIC N301 may be defective.
d. TP433 for 0...+3.3V pulses. Pulse width:
4...10 µs for time base 2 µs/div and faster;
>40 µs for time base 5 µs/div and slower; pulse width increases with time base.
e. TP336 for +0.6...0V pulses, TP436 for +3.3...0V pulses; the pulse width is about
40 µs...10 ms.
If not correct, check the RANDOMIZE circuit, see 7.5.15.
f. TP437 (SMPCLK) for a 5 MHz (time base 10 ms/div) or 25 MHz (time base
< 1 ms/div) clock signal (3.3V). Check SMPCLK on both sides of R339.

Table of Contents

Other manuals for Fluke 43B

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Fluke 43B and is the answer not in the manual?

Fluke 43B Specifications

General IconGeneral
CategoryPower Quality Analyzer
InterfaceRS-232
Volts AC/DCYes
OhmsYes
ContinuityYes
Diode TestYes
CapacitanceYes
Harmonics MeasurementUp to 51st harmonic
DisplayLCD
Battery LifeApproximately 6 hours
Weight1.1 kg (2.4 lb)
Data StorageYes
Amps AC/DC0.1 to 1000 A (with clamp)
Power MeasurementW, VA, VAR, PF
Dimensions50 mm
Current Measurement RangeVia current clamp accessories (not built-in)

Related product manuals