Digital Multimeter Measurement System; Check Decimal Point Position; Check Input Leakage Current; Check Character Generator - Tektronix 213 DMM Instruction Manual

Performance Check-213 Service
D. DIGITAL MULTIMETER MEASUREMENT SYSTEM
Equipment Required
1. DC Voltage Standard
2. DC Current Standard
3. Resistance Standard
4. Sine-Wave Generator
5. Digital Voltmeter
6.
AC Calibration Standard
7. Screwdriver
8.
Adapter, Probe
9. Adapter, Banana Plug (2 required)
10. T-Connector
11. Cable
Control Settings
POWER ON
DMM
RMS
VOLTS
VOLTS-mA/DIV
INTENSITY
Button in
Button out
Button in
100 (blue scale)
Minimum for a visible
display
1. CHECK DECIMAL POINT POSITION
a. Set INPUT COUPLING to GND.
b. CHECK-Decimal 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 CHARACTER GENERATOR
a. Set VOL TS-mA/DIV to 1 (blue scale).
b. Connect the probe to the DC Voltage Standard with
a dual banana-plug to BNC adapter and probe adapter.
Set the Standard to +1.005 volts.
c. CHECK-Readout displays +1.005.
d. Rotate the Standards 100 mV selector from O through
9 ( 1.005 to 1.905).
e. CHECK-Millivolt digit on the readout displays a 0
through 9 (+1.005 through +1.9005).
4. CHECK POLARITY INDICATION
a. Note the polarity of the reading on the display.
b. Reverse the banana plug connector at the Standard.
c. CHECK-Display reverses polarity sign.
d. Reset banana-plug connector for positive inputs.
5. CHECK DC VOLTAGE MEASUREMENT ACCURACY
a. Set VOL TS-mA/DIV and the DC Voltage Standard as
shown in Table 5-4.
b. CHECK-Reading is within limits shown in Table 5-4.
6. CHECK RMS CONVERTER DC VOLTAGE RESPONSE
a. Set RMS pushbutton in.
b. Set VOL TS-mA/DIV to 1 (blue scale).
c. Set the DC Voltage Standard to +1.000 V.
d. CHECK-Reading of 1.000 ± 0.025 (0.975 to 1.025).
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