Filter
Top Products
182 Service Procedures
Appendix D
AC Amplitude Adjustment (50 Ohms)
1. The function generator stores sixteen calibration constants related to
50 Ω output. The constants are calculated from the adjustment value
entered. The calibration constants are stored following completion of
SETUP 49 and the calibration procedure may be aborted after that
point. No calibration constants are stored if the procedures are
aborted at any other setup.
2. Use the DMM to measure the resistance of a 50 Ω feedthrough load.
Record the measurement for step 3. You can measure the load and
cable resistance (recommended procedure) or just the load as shown
below.
3. Enter the following SETUP 33 and measure the value of the 50 Ω
feedthrough load (and cable). Send the CAL:VALue <measured Ω>
to the function generator. This number will be used to calculate the 50
Ω output amplitude calibration constants.
Note Once the value of the 50 Ω load and cable are entered, use the SAME load
and cable for all 50 Ω tests.
4. Use the DMM to measure the function generator ACrms output
voltage for SETUP 34 in the table on the next page. These
adjustments use the 50 Ω load and cable measured in step 2 and
connected as shown in Figure D-3.
Figure D-2. 50 Ohm Feedthrough/Cable Resistance Measurement
Table D-15. 50 Ohm Adjustment Setup
Nominal Input
SETUP LOAD Z
33 50 Ω Enter measured value of load.