Front-Panel Operation; Front And Rear Panels; Gain; Autozero - Stanford Research Systems SIM918 Operating And Service Manual

1.2 Front-Panel Operation

1.1.7 Front and rear panels

1.2 Front-Panel Operation

1.2.1 Gain

1.2.2 Autozero

1.2.2.1 Engaging the autozero circuit
SIM918 Precision Current Preamplifier
Figure 1.2: The SIM918 front and rear panels.
The gain R of the preamplifier, in volts per microampere, is indicated
F
on the front panel of the instrument via a green annunciator LED.
Press one of the [GAIN
is pressed when R
F
pressed when R 100 V A, the press has no e ect.
F
A simultaneous press of [GAIN
press initiates autocalibration (Section 2.6).
The autozero circuit is turned ON by the press of a front-panel button.
There will be a pause of up to 3.3 seconds (a wait for a positive-going
edge of the reference clock). At the end of the pause, the green
2
Note the minus sign in Eq. (1.1); the output voltage is positive for a current that
flows out of the input terminal.
] buttons to change the gain. If [GAIN ]
1 V A, the press has no e ect. If [GAIN ] is
] has a special meaning. This
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2