Specifications
PERFORMANCE
TESTS
64. Move the cursor to CABLE
CORRECTION
MENU field.
65. Press the 1 and
ENTER
keys to start the 1 m Cable Correction.
66. Perform the 1 m
Cable Correction according to the instruction on the
HP
4285A's LCD.
67. Press the MEAS
SETUP
MENU key and the 'CORRECTION' softkey to display the
CORRECTION
page.
68. Move the cursor to
CABLE field, and press the '1 m' softkey to set the cable
length
to 1 m.
69. Connect the 1 m Test Leads
(HP
16048A) to the UNKNOWN terminals.
70. Store
the OPEN CORRECTION data and the SHORT CORRECTION data, refer to
steps 33 to 38.
In
this procedure the
OPEN
termination and the SHORT termina-
tion
should
be
connected to the 1 m Test Leads
(HP
16048A) with 4 BNC(f)-
BNC(f) adapters.
71. Press the
'DISPLAY FORMAT MENU' key to display the MEAS DISPLAY page.
72. Connect the 100
pF
Standard to the 1 m Test Leads.
73. Move the cursor to the LEVEL
field, and set the test signal level to 1
V.
74. Move the cursor to the
FREQ
field, and set the test frequency to 1 MHz.
75. Press the
TRIGGER
key, and confirm that the
HP
4285A's reading is within the
specified test
limits listed in Table 1-9.
76. Perform the test for
all standards and settings listed in Table 1-9, by repeating
steps 72 to 75 for each
listed setting.
Table 1-9. Impedance Measurement Accuracy Test Limits
(1
m
Low
Frequency
Test)
Signal
Test Limits (Cp,D)
Level 100 pF 1000 pF
1
V
Cp
C.V.±0.22
pF
C.V.±2.1
pF
D
±0.0022 ±0.0021
2 V
Cp
C.V.±0.28
pF
C.V.±2.5 pF
D
±0.0028 ±0.0025
Test Frequency: 1 MHz
C.V.: Calibration Value at 1 MHz
1-20