Impedance Accuracy - Protek 9216A User Manual

2. Set the 9216A to its default conditions by pressing the key sequence RCL 0 EN-
TER. Set the unit to constant voltage mode. The output voltage should be 1.0
Vrms at 1 kHz. Verify that the voltage reading is between 0.98 and 1.02 Vrms.
Record the result.
3. Repeat step 2 for 100 Hz, 120 Hz, and 100 kHz. All voltage readings should be
between 0.98 and 1.02 Vrms. Record the results.
4. Set the frequency to 1 kHz. Set the voltage sequentially to 0.25V and 0.10V.
The DVM should read within 2.0% of the nominal values (between 0.245 and
0.255 and between 0.098 and 0.102, respectively). Record the results.
5. Set the DVM to DC volts. Set the 9216A to the C+D measurement mode, 100
kHz test frequency, 0.10 V drive voltage with internal Bias on. Verify that the DC
voltage is 2.0 VDC  2%.

Impedance Accuracy

These tests confirm that the 9216A meets its impedance measurement accuracy specifi-
cation. Precision impedance standards are required. The minimum and maximum
acceptable values are determined by adding the tolerance of the 9216A and that of the
standard. For example, at 1.000 k the tolerance is 0.05%, the tolerance of the re-
sistance standard is 0.02%, and thus the total tolerance is 0.07% or 0.7 . So the
range of acceptable values is 999.3  to 1000.7 . If standards with different tolerances
are used, the acceptable limits will have to be adjusted.
Resistance Accuracy
1. Connect the Fixture Adapter to the 9216A. Install a BNC to stacking banana plug
adapter on the end of each BNC cable. Tape over (or cut off) the ground leads of
the plugs connected to the orange (PH) and purple (PL) cables. Connect the
ground leads of the red (IH) and blue (IL) cables to the case ground of the decade
box. Plug the orange and purple signal leads to the "+" and "" terminals on the
decade box. Plug the red signal lead into the orange signal lead and plug the
blue signal lead into the purple signal lead. Set the 9216A to its default conditions
by pressing RCL 0 ENTER, then press the R+Q key and set the test frequency to
1 kHz.
2. Unplug the red/orange lead pair from the "+" terminal of the decade box and plug
them into the blue/purple lead pair. Perform short circuit calibration. Remove the
red/orange lead pair form blue/purple lead pair and locate them at the same sep-
aration from the blue/purple pair as they will be during operation. Perform open
circuit calibration.
3. Connect the red/orange lead pair to the "+" terminal of the decade box. Set the
dials to all zeros. Note the resistance value that the 9216A measures. This is the
resistance of the switch contacts and connectors. Enter this as a relative value in
the entry display. Set the 9216A to the DEV display mode.
4. Set the decade resistor and the 9216A according to the values in the Resistance
Accuracy Table below. Verify that the readings fall within the acceptable values.
Record the results.
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