Digital Multimeter Measurement System; Check/Adjust Decimal Point Position; Check Input Leakage Current; Check/Adjust Dc Calibration - Tektronix 213 DMM Instruction Manual

Calibration-213 Service
0. DIGITAL MULTIMETER MEASUREMENT SYSTEM
Equipment Required
1. DC Voltage Standard 7. Screwdriver
2. DC Current Standard
8. Adapter, Probe
3. Resistance Standard
9. Adapter, Banana-Plug (2 required)
4. Sine-Wave Generator 10. T-Connector
5. Digital Voltmeter 11. Cable
6. AC Calibration Standard
For adjustments and test points (TP), see
ADJUSTMENT LOCATIONS
pullout page in the Diagrams section.
Control Settings
POWER ON
DMM
RMS
VOLTS
VOLTS-mA/DIV
INPUT COUPLING
INTENSITY
Button in
Button out
Button in
100 (blue scale)
GND
Minimum for a
visible display
1. CHECK/ADJUST DECIMAL POINT POSITION
a. CHECK-Decimal point is midway between the 3rd
and 4th character.
b. ADJUST -Character Spacing Adj., R280, so the deci-
mal point is midway between the 3rd and 4th character.
2. CHECK INPUT LEAKAGE CURRENT
@
a. Set: VOL TS-mA/DIV
INPUT COUPLING
0.1 (blue scale)
DC
b. Connect the probe tip and the probe common clip
together and note the reading. Then disconnect them
and note the reading.
c. CHECK-Readings are within .0020 of each other.
3. CHECK/ADJUST DC CALIBRATION
a. Set: VOL TS-mA/DIV
INPUT COUPLING
1 (blue scale)
GND
b. Recheck steps B1a and B1b, and if necessary, B1c.
If reading is not 0.000, recheck step B1d through B1g.
c. Set INPUT COUPLING to DC.
d. Connect the probe to the DC Voltage Standard with
a dual banana plug to BNC adapter and probe adapter.
Set the Standard to +2.000 volts.
e. CH ECK-Reading of +2.000 ± .003 (+1.997 to
+2.003).
f. ADJUST -DC Cal, R235, for a reading of +2.000.
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