78
Service Manual
3-8
3-13. Display Test
To test the display, hold the pushbutton down and turn the Fluke 78 on. All segments
will remain on as long as the pushbutton is held down. Check whether all display
segments come on as indicated in Figure 3-2.
0 3 4000
AC DC
mV
Mk Hz
RPM
2
MIN
MAX
V
AUTO
1
2
1
zr06f.eps
Figure 3-2. Display
3-14. DC Voltage Test
1. Set the Fluke 78 rotary switch to F and connect the DC Voltage Calibrator output to
the z and COM input terminals of the meter.
Note
For autorange to include the 400 mV (lowest) range, press the pushbutton
three times.
2. Referring to Table 3-2, set the DC Voltage Calibrator for the output indicated, and
verify that the Fluke 78 display reading is within the limits shown.
3. Reset the source to 0 V.
Table 3-2. DC Voltage Test
Step Input Display Reading
Range Voltage
1 400.0 mV short 0 to +/-000.5 m V DC
2 4000 mV or 4.000 V +3.500 V 3488 to 3512 V mV DC or
3.488 to 3.512 V DC
3 4000 mV or 4.000 V - 3.500 V -3488 to 3512 mV DC
-3.488 to -3.512 V DC
(and within 2 counts of +3.5 V reading)
4 40.00 V +35.00 V 34.88 to 35.12 V DC
5 300.00 V +350 V 348.8 to 351.2 V DC
6 300 V +500 V 497 to 503 V DC
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