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Model 4277A
SECTION IV
4-21.
PHASB ACCURACY TBST
4-22. This test eheeks to the accuracy of phase measurements over the full frequency
range. The phase accuracy test is made by connecting a resistor with extremely low
reactive elements and by reading the displayed phase angle (almost zero) to verify that
the impedance vector (phase angle) of the DUT has been accurately detected.
EQUIPMENT:
Standard Resistors
Termination
.
. ioq'
OQ
OPEN (OS),
HP 16074A
Standard Resistor
Set
Note
The resistors used as references in this test have been designed to maintain an
extremely low (residual) reactance at frequencies up to
IMHz.
The
Ofi
termination has been specially designed for use with the 0.1^^, in, and lOQ
standard resistors and provides an optimum termination impedance for the
"short" offset adjustment to be made before performing tests with these
standards.
PROCEDURE:
1. Set the 4277A*s controls as follows:
DISPLAY A function . I Z [
CIRCUIT MODE . AUTO
LC I Z I
RANGE . AUTO
MEAS SPEED . MED
TRIGGER . INT
CABLE LENGTH switch . 0
DC BIAS switch . OFF
Other controls . Any setting
2. Perform OPEN and SHORT zero offset Adjustment as described in steps 1, 3, 6
and 7 of paragraph 4-15.
Note
Be sure to use the OPEN and on termination of the 16074A for zero
offset Adjustment. DO NOT use the Short termination.
3. Disconnect the 0f2 termination and connect the lOfJ standard Resistor directly
to the UNKNOWN terminals.
4. Set the test frequency and TEST SIG LEVEL in accordance with Table 4-9.
Phase angle readings should be within the test limits given in the table.
4-19
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