Self Tests
The internal self-tests verify the functionality of the Model Z9216. Turn on the unit. The ROM
program and model name will be displayed for about three seconds. Next the message "tESt....' will
be displayed while the unit performs its self tests. After the tests are completed the unit should display
'tESt PASS' to indicate that the tests were successful. If not, an error message will appear. See the
TROUBLESHOOTING section for a description of the error messages.
Output Voltage
This test checks the Model Z9216 output voltage for the correct frequency and amplitude.
1. Set the Model Z9216 to 1 kHz, 1 V and constant voltage. Set the scope to 1 V/div vertical and
0.5 ms/div horizontal. Connect a ×10 probe to the scope.
2. Place the tip of the probe into the "+" side of the fixture and connect the ground clip to the
center guard.
3. The scope should display a sine wave that occupies two divisions horizontally and about 5.5
divisions peak to peak vertically (1.0 Vrms - 2.83 V peak to peak). There should be no
irregularities in the waveform.
4. Change the amplitude setting of the Model Z9216 to 0.25 and 0.10 V in succession and verify
that the output is within 2% of nominal.
5. Set the amplitude back to 1.0 V. Change the Model Z9216 and scope settings to verify that
the output at 100 Hz, 120 Hz, 10 kHz and 100 kHz is within 2% of nominal.
Resistance Measurement
This test verifies that the Model Z9216 operates and is able to measure a component in each of its
ranges. The readings obtained should be within ±(tolerance of the component + tolerance of the
Model Z9216).
1. Press the key sequence RCL 0 ENTER to put the unit in its default setup.
2. Perform open and short circuit calibrations for the fixture configuration to be used. See
Volume 1 for details on these null calibrations.
3. Set the unit to the R+Q measurement mode, series equivalent circuit, and 1 kHz test
frequency. Install the 24.9 Ω resistor.
4. Verify that the meter reads the resistance correctly to within ±0.15%. Verify that Q is a small
value, about +0.0001 or smaller. Install the 402 Ω resistor. Verify that the meter reads the
resistance correctly to within ±0.15%. Verify that Q is a small value, about +0.0001 or smaller.
5. Change the equivalent circuit to parallel. Install the 6.34 kΩ resistor. Verify that the meter
reads the resistance correctly to within ±0.15%. Verify that Q is a small value, about −0.0001
or smaller.
6. Install the 100 kΩ resistor. Verify that the meter reads the resistance correctly to within
±0.15%. Verify that Q is a small value, about −0.0002 or smaller.
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