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Chapter 3
CH1 & CH2 Outputs
The Channel 1 and Channel 2 outputs can be configured to output a voltage from −10 V
to +10 V proportional to X or R (CH1) and Y or θ (CH2). The sensitivity setting
determines full scale (±10 V).
Signal Inputs
The voltage input mode may be single-ended, A, or differential, A−B. The A and B
inputs are voltage inputs with 10 MΩ, 25 pF input impedance. Their connector shields
are isolated from the chassis by 10 Ω (Ground) or 1 kΩ (Float). Do not apply more than
10 V to either input. The shields should never exceed 1 V.
The current input is configured for either 1 µA or 10 nA current range. The input burden
resistance is 100 Ω (1 µA) or 1 kΩ (10 nA) to a virtual ground.
Key Click On/Off
Press and hold the [Calc/system] key to display the system menu. Touch {Sounds} to
toggle the key click on and off.
Display Off Operation
Press the [Blank] key to operate with the front panel display and LEDs off. The SR865A
is still operating, the outputs are active, data collection continues and the unit responds to
interface commands. To change a setting, press [Blank] to return to normal operation,
change the desired parameter, then press [Blank] again.
Front Panel Test
To test the front panel, press and hold [Local] and [Auto Range] at the same time.
Turn any knob to run through all of the LEDs. Make sure all of the knobs and all of the
LEDs work.
Touch and drag on the touchscreen to display a little trail. The bright end signifies the lift
location. This verifies the touch functionality.
Press each key to toggle its position (green/gray) on the screen. Keys with a secondary
press and hold function need to be held to toggle. The knobs also have a press and hold
feature. Check to see that all keys and knobs function.
The [Screen Layout] key exits this screen.
Operation
SR865A DSP Lock-in Amplifier
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