7
INSTRUMENT OVERVIEW
FR ONT PANEL SUMMAR Y
FR ONT PANEL OPER ATION
The front panel has been designed to be nearly
self-explanatory. The effect of each keypress is
usually reflected by a change in the state of a
nearby LED.The front panel controls for each filter
channel are identical. The following discussion of
the front panel controls applies to both channel 1
and channel 2.
POWER BUTTON
The SR640 is turned on by depressing the POW-
ER button. When the unit is turned on, the model
number, serial number and firmware version num-
ber will appear briefly on the LED dis-
plays.
When the unit is powered off, all instru-
ment settings are stored in non-volatile memory.
Upon power up, the SR640 checks the consisten-
cy of the stored settings. If an error appears on
power up, the instrument is returned to its default
state. The default state for each filter channel is:
Cutoff Frequency:
5 kHz
Coupling:
DC
Source:
A
Invert:
Off
InputGain:
0 dB
Output Gain:
0 dB
Filter:
In
FR EQUENCY DISPLAY
The three digit LED displays indicate the cutoff fre-
quency of each filter.
The adjacent unit LEDs in-
dicate whether the displayed frequency is in Hz or
kHz.
The cutoff frequency for either channel may
be changed using the frequency increment and
decrement buttons to the right of the dis-
play.
When one of these buttons is pressed, the
displayed frequency will begin scrolling up or
down. Note, however, that the actual filter cutoff
frequency does NOT change until the ENTER but-
ton is pressed.
The ENTER LED will light to indi-
cate that the displayed frequency does not match
the actual filter cutoff frequency.
When the EN-
TER button is pressed, the ENTER LED will turn
off and the filter frequency will change to match
the displayed frequency.
If the frequency display
has been changed but it is not desired to change
the actual filter cutoff frequency, pressing the CLR/
LOCAL button will reset the display to the actual
filter frequency.
SOUR CE SELECT
There are two input BNC connectors provided for
each filter channel. When source LED 'A' is on,
the input signal is measured between the center
conductor of the 'A' BNC connector and its
shield.
When the 'B' LED is on, the signal is
measured between the center conductor of the 'B'
BNC connector and its shield. When the 'A-B' LED
is on, the signal is taken between the center con-
ductor of the 'A' connector and the center conduc-
tor of the 'B' connector.
In all cases, the shields
of the 'A' and 'B' BNC connectors are connected to
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Summary of Contents for SR640 Series
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