I Mpedance Measurement Adjustments 2-1 - Agilent Technologies 4284A Service Manual

2-1 2. I M PEDANCE MEASUREMENT ADJUSTM ENT
This adjustment m inimizes the null amplifier DC offset and the zero offset, and then updates
the E E P R O M calibration data to optimize the impedance measurement accuracy.
All othe r adjustments must have been completed before perform i n g this
adj ustment.
EQUIPMENT:
Computer
M ultimeter
H P- I B Cable
2 Alligator Clips to 1 Dual Banana Plug
Test Lead
Calibration R-L Standard
Adapter B NC(f) to BNC(f)
Test Leads (1 m)
Test Leads (2 m)
Test Leads (4 m)
PROCEDURE:
1 . Display the adjustment program's main menu, referrin g to paragraph 2-7-
2, I N ITIAL OPERATING PROCEDURE.
2 . Press the 'Adj.3' softkey to select the Impedance M easurement Adjustment.
When the computer can not access the HP 3458A, the H P- I B address
registration display appears. Enter the HP 3458A's H P-I B address
using the n umeric keys and the 'Enter' softkey.
3. Perform the null amplifier DC offset adjustment accord ing to the program's in­
struction. Figure 2-1 4 shows the adjustment setup , Figure 2-1 5 shows the
A2TP3 (X30), A2TP4 (GND) and A2R 1 23 (NULL AMP VOS ADJ) locations.
NOTE
HP 9826A
HP 3458A
HP 1 0833A
HP 1 1 002A
HP 1 6074A
HP PN 1 250-0080 4 ea.
H P 1 6048A
H P 1 6048D (Option 006 only)
H P 1 6048E (Option 006 o nly)
NOTE
2-1 9