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Test procedures:
1.
Remove the top cover of the SR446. Power up and configure the unit as stated above.
Wait at least 20 minutes to warm up the device.
2.
Power up and configure the SR865A as stated above. Wait at least 20 minutes to warm
up the device.
3.
Measure the reference signal:
o
Connect the SR865A SINE OUT + to the SIGNAL channel A through a 50
Ω
load
o
Verify that the measured value is about one half of the set value, between 48% to
52%.
o
Press and hold the OFFSET knob under <CH1 OUTPUT> to display offset
keypad
o
Press the on-screen Auto button (LED, next to the OFFSET, should be energized)
o
Verify that R value is less than +/-0.1 mV
4.
Measure and Out gain:
o
Connect the SR865A SINE OUT + to the input of SR446
o
Connect the SR446 +Out to channel A of the SR865A through a 50
Ω
load
o
Adjust the trim pot R512 so that the “R” reading is b1 mV and -1mV
o
Press "Auto Phase” button under FUNCTION on the SR865A
5.
Measure and adjust -Out gain:
o
Connect the SR446 -Out to channel B of the SR865A through a 50
Ω
load.
o
Connect channel A of the SR865A with a shorting cap
o
Adjust the trim pot R412 so that the “R” reading is b1 mV and -1 mV
Also verify that the phase is between 179° and 181°
6.
Turn off the power and disconnect all cables to the SR446. Replace and secure the top
cover.
