Stanford Research Systems SR446 Operation And Service Manual page 30

26
4. Press the [Config] button, and then touch the on/off tiles to disable
graphs for X, Y, and Θ . Leave "Data 3" set to R, and graph On.
Touch [close].
5. Press the [Screen Layout] button twice, so the display is showing
large numeric displays for X, Y, R, and Θ , and the bottom half of
the display has a strip chart for R.
6. Push the INPUT RANGE down button twice, to select 100 mV.
7. Push the FILTER [Slope] button three times, to select 24 dB. Then
press and hold the [Slope] button to select Advanced.
8. Near the top left of the display, touch the gray Fint tile to bring up
the control window for setting internal frequency. Enter 1 MHz.
9. Near the top right of the display, touch the gray Ampl tile to set
the sine out amplitude. Enter 20 mV.
10. Connect a BNC cable from the SINE OUT + connector, to the
terminated BNC tee at the "A" input.
11. Press the [Auto Scale] button to increase resolution on the display.
Then slowly adjust the AMPLITUDE knob until the "R" display
value shows as close to 10.00 mV as possible (must be between
9.90 mV and 10.10 mV). Make a note of the final value displayed
as R.
Figure A.1: Location of R412 and R512, near the front of the SR446 circuit board.
SR446 400 MHz Programmable Gain Preamplifier
Appendix A Gain Calibration