SRS Labs SR850 Quick Start Manual

OFFSET ADJUST:

Note: Adjust pots as low as possible

Voltage Offset (P101)

1. Reset the unit by turning ON the unit while pressing the setup key
2. Set the Lock-in using the follow ing settings:
- sensitivity = 100mV
Oct = 24 dB
-
R display / X output
-
θ display / Y output
-
Amplitude = 0.004 V
-
- Frequency = 1.000 Hz
3. Adjust P101 to make R (channel one display) less than 10 mV. (R<10 mV)
4. Change Sensitivity = 10 mV and adjust P101 again to obtain a R < 1 display.
5. Change the Sensitivity = 1 mV and adjust P101 to get a R < 0.02 display.

CMRR Offset (P102)

1. Reset the unit. (A quick reset will do. You can do this by turning the unit ON while pressing the local key)
2. Connect a T-connector on Sine output and connect a similar length cable to A/I and B inputs. Connect those cables
to the T-Connector on the Sine output.
3. Set the Lock-in using the following setting:
Sensitivity = 2 mV
-
Turn on the Sync Filter ON (Sync < 200 Hz should light up)
-
A-B input
-
- Oct = 24 dB
DC couple
-
R display / X output
-
θ display / Y output
-
Amplitude = 1.000 V
-
- Frequency = 100.00 Hz
4. Adjust P102 to obtain a R < 0.2 mV .
Then change the sensitivity to 200 µV and adjust P102 again to get a R < 2µV
5.
Voltage Offset (P101)
1. Disconnect all the cables and reset the unit.
2. Set the following:
Sensitivity = 1 mV
-
Oct = 24 dB
-
R display / X output
-
θ display / Y output
-
- Amplitude = 0.004 V
- Frequency = 1.000 Hz
3. Adjust P101 to obtain a R < 0.02 mV display.

Current Offset (P103)

1. Settings:
- Sensitivity = 100 mV
- Oct = 24 dB
6
I (10 ) input
-
- DC couple
Ground
-
- R display / X output
θ display / Y output
-
Amplitude = 0.004 V
-
- Frequency = 1.000 Hz
2. Adjust P103 to get a R < 10 nA display.
3. Change Sensitivity = 10 mV and adjust P103 to make R <1 nA.
SR850 OFFSET AND LINE NOTCH ADJUST
(P101, P102, P103, P201, P202, P221, P222)