Technical data

Performance Tests and Calibration 4
34405A User’s and Service Guide 97
Ohms Gain Adjustment Procedure
Review the “Test Considerations” on page 67 and “Gain Adjustment
Considerations” on page 90 sections before beginning this procedure.
This procedure adjusts the gain for the two- wire ohms function. The gain
for the 100 M
Ω range is derived from the 10 MΩ range and does not have
a separate adjustment point.
1 Press to enter the Ohms Gain Adjustment Mode.
2 The primary display will show the calibration value and the secondary
display will show the first reference value of the Cal Item (Short).
3 Configure each Cal Item shown in the adjustment table below.
4 Use (Auto) or (Range) to select the Cal Item.
5 Apply the input signal shown in the Input column of the table.
6 Enter the actual applied input (see “Entering Adjustment Values” on
page 86).
7 Press to start the adjustment. The CAL annunciator flashes to
indicate the calibration is in progress.
• Successful completion of each adjustment value is indicated by a
short beep and the primary display briefly showing PASS.
• An adjustment failure is indicated by a long beep, the primary
display showing FAiL and a calibration error number appearing in
the secondary display. Check the input value, range, function, and
entered adjustment value to correct the problem and repeat the
adjustment step.
8 Repeat steps 3 through 7 for each gain adjustment point shown in the
table.
NOTE
If the zero adjustment procedure has been recently performed prior to the ohms gain
calibration procedure, the Cal Items Short and Open can be skipped.
NOTE
Always complete tests in the same order as shown in the appropriate table.
Disp