Fluke PM3082 Service Manual page 420

5.11-8
CHARACTERISTICS
INPUT VOLTAGE LIMITS
A (d.c. + a.c. peak)
A
Note 1: Apparatus should be properly grounded through the protective ground conductor of the
power cord.
Note 2: Up to 10 kHz; > 10kHz see figure 1.1.
Sensitivity
EDGE TRIGGER SENSITIVITY
d.c. to 5 MHz
d.c. to 10 MHz
Note 3: In noise-trigger multiply stated value by 2.
Trigger level
Range
Accuracy
Note 4: With Level-pp on the range is restricted to the peak- peak value of the trigger signal.
Circuit description
Refer to figure 5 for the circuit diagram. The input signal is routed via RC circuit R1001/C1002 and a
coaxial cable to the small printed circuit board. Via protection diodes V2002 the signal is applied to
the operational amplifier N2021. This device functions as amplifier and level shifter. The analog
multiplexer D2031 the output signal MTRIGEXT. This signal is applied to the base of transistor V6507
in the MTB trigger section on unit A1 (diagram 12). Multiplexer D2031 applies -9 V (-9EXT) to the
diodes V2012 if the external trigger signal is not needed. This suppresses the signal directly at the
input.
Parts list
Item number
C 1001
C 2082
C 2091
C 2001
C 2003
C 2004
C 2011
C 2016
C 2021
C 2023
C 2032
C 2082
C 2086
C 2092
C 2094
SPECIFICATION
±400 V
100 mV
200 mV
±1.5 V
<0.4 V
Description
33pF/500V
47uF/25V
47uF/25V
56pF/63V
100nF/63V
100nF/63V
10nF/63V
100nF/63V
100pF/63V
33pF/63V
100nF/63V
100nF/63V
100nF/63V
100nF/63V
100nF/63V
ADDITIONAL INFORMATION
See note 1
See note 2
See note 3
Service ord code
4822 122 31202
4822 124 20699
4822 124 20699
5322 122 32661
4822 122 33496
4822 122 33496
5322 122 34098
4822 122 33496
5322 122 32531
5322 122 32659
4822 122 33496
4822 122 33496
4822 122 33496
4822 122 33496
4822 122 33496
UNIT DESCRIPTIONS
See note 4
at 1 kHz inputsignal
triggercoupling DC