Sense Amplifier Dc O Ffset Adjustment - Agilent Technologies 4284A Service Manual

2-9. S E N S E A M P LIFIER DC OFFSET ADJUSTMENT
This adjustment m inimize the DC offset voltage between the voltage channel sense amplifier
and the current channel sense amplifier.
EQUIPM ENT:
M u ltimeter
Calibration R-L Standard
Extender Board (For Analog Board)
2 Alligator Clips to 1 Dual Banana Plug
Test Lead
PROCEDURE:
1 . Connect O P E N to the UNKNOWN terminals.
2. Set the m ulti meter to DC voltage measurements function.
3. Connect the Test Lead to the mu llimeter input.
4. Hold up the A3 board using the extender board.
5. Connect the multimeter Lo input to A3TP4 (ERR). Then connect the m ultim eter
Hi input to A3TP6 (EDUT). Figure 2-9 shows the location of TP4 and T P6.
HP 3458A
HP 1 6074A
HP PN 04278-66598
HP 1 1 002A
2-1 4