Fluke 8062A Instruction Manual page 88

8062A
Instruction Manual
Table 4-7. Troubleshooting the Resistance Function: Voltage Sources
Voltage Source
Range
200
2 k
20 k
200 k
M
Pin No. Mnemonic
1
2
3
4
5
6
7
8
9
10
11
4-26
for Ranges
( 10%)
4.5V
1.2V
1.2V
1.2V
2.1V
Table 4-8. U3 (MAC) Pin Descriptions
Tone 2.66 kHz square wave to tone generator.
CFO Output, + input, - input, respectively, of the
CM+ continuity function comparator.
CM-
VSS -5.1V supply (externally generated).
HI Input to the a/d converter.
LO Sense ground for the a/d converter.
FC+ Connections to the "flying capacitor" which
FC- stores the reference voltage applied to the a/d
converter during the read period. Plus and
minus signs indicate polarity of stored voltage.
COM Analog common.
VREF+ Input for 1V reference voltage for a/d converter
and power supply.
Comment
These values should be obtained when
no external resistors are connected to
the resistance inputs. Measure voltage
between common (J2) and TP10. Note
that the M and 200 k ranges will be
loaded by a 10 M input impedance.
Use a high impedance voltmeter for the
measurement or decrease the voltage
source magnitude appropriately. A DMM
with a 10 M input impedance will read
approximately 1.9V in the M
Description
range.