Status Indicators

Screen Display

Ext S	Fr= 100.00	Hz	GPIB
	Harmonic=	1	LOC

SRQ TRIG

There are a number of status indicators which are displayed at the bottom of the screen. These include the scan, unlock, and overload indicators, the reference frequency and source, and interface status.

Stop • Run 1 • Run • Pause • Done

When the data buffers are reset (pressing [PAUSE RESET] while paused or done), then Stop will be indicated.

When a scan is in progress in the 1 Shot mode, Run 1 is indicated. The storage of trace data in the buffer continues until the scan is complete at which time Done is displayed.

If a Loop scan is in progress, Run is displayed. The storage of trace data in the buffer may contin- ues indefinitely. When the buffer fills, the oldest data is written over.

If the scan is paused (with the [PAUSE/RESET] key for instance), then the Pause indicator will be on. Pressing [START/CONT] will continue the scan from a paused state.

RESRV • INPUT

If the analog signal amplifier overloads before the phase sensitive detector, then RESRV or INPUT is displayed.

RESRV indicates that the signal amplifier is over- loaded. Change the sensitivity or increase the dynamic reserve.

INPUT indicates that the actual signal input is overloaded. This occurs for voltage inputs greater than 1.4Vpk (unless removed by AC coupling) or current inputs greater than 10 µA DC or 1.4 µA AC (1MΩ gain) or 100 nA DC or 14 nA AC (100MΩ gain). Reduce the input signal level.

FILTR

If an overload occurs in the low pass filters after the PSD's, then FILTR is displayed. Increase the time constant or filter roll-off or decrease the dynamic reserve.

OUTPT

If the output (either X, Y, R or a trace output volt- age) is greater than 1.09 times full scale, then OUTPT is displayed. This can occur if the sensitiv- ity is too low or if the output is expanded such that the output voltage exceeds 10 V. Note that a trace output can overload even if it is not being dis- played on the screen or output to CH1 or CH2.

Intrnl • Sweep • Ext S • Ext + • Ext -

If the internal reference is being used, then Intrnl is displayed. If the internal reference frequency is being swept, then Sweep is displayed. When using an external reference source, the reference mode may be set to Sine (Ext S), Rising TTL edge (Ext +), or Falling TTL edge (Ext -).

LOCK • UNLOCK

The UNLOCK indicator turns on if the SR850 can not lock to the external reference. LOCK is dis- played when the SR850 is successfully locked to the reference. LOCK is always on when in internal reference mode.

Fr= XX.YYY Hz

The reference frequency (internal or external) is displayed continuously.

Harmonic = N

The SR850 can detect synchronous signals at N times the reference frequency. Generally, N is equal to 1.

GPIB • RS232

Flashes when there is activity on the computer interfaces. This does not flash for printer or plotter activity.

ERR

Flashes whenever there is a computer interface error such as an illegal command or out of range parameter is received. This does not flash for a printer or plotter error.

LOC • REM

REM is on when the front panel is locked out by a computer interface. No front panel adjustments may be made. To return the unit to local control (if

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SR850 specifications

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SRS Labs SR850 manual Status Indicators

Models: SR850

Screen Display